RECOMBINANT PHAGES

Abstract: The present invention relates to bacteriophages for use in the treatment or prophylaxis of bacterial infections, especially mucosal bacterial infections such as Helicobacter pylori infections. In particular, it relates to modified filamentous bacteriophages, e.g. M13 phages, for such use, which bacteriophages present at its surface a recombinant protein comprising: (i) a first component derived from a bacteriophage surface protein; and (ii) a second component comprising variable region sequences of an antibody to provide a bacterial antigen binding site, said second component rendering said bacteriophage capable of binding to and thereby inhibiting growth of bacterial cells involved in the etiology of said infection.

Description: RECOMBINANT PHAGES TECHNICAL HELD This invention relates to bacteriophages useful for the treatment of bacterial infections, especially mucosal bacterial infections such as Helicobacter pylori infections. BACKGROUND ART Bacteriophages and antibiotic resistance Resistance to antibiotics is a global problem of increasing medical and economical importance. There is thus a great need for alternative methods to eradicate bacteria which will circumvent the problem of such resistance. A bacteriophage, or phage, is a virus which specifically infects bacteria. Phages bind to their host bacterium and transfer genes encoding various phage proteins. They utilize the protein-synthesizing machinery, amino acids etc., and the energy provided by the host bacterium for their replication (Maloy et al. (eds.): Microbial genetics. Jones and Bartlett Publishers, 1994). Most phages lyse or by other mechanisms destroy specific strains of bacteria. The present invention stems from the realisation that genetic modification of phages, in particular filamentous bacteriophages, offers a means for designing new bacterium-specific phages capable of eradicating certain bacteria, e.g. Helicobacter pylori, and having the potential to overcome problems related to antibiotic resistance. Filamentous phages E. coli cells bearing hair-like F-pili are hosts for filamentous phages such as M13, fd and fl. These Ff (F pili, filamentous) phages are nearly identical in sequence and behaviour (Rashed & Oberer (1986) Microbiological reviews 50, 401-427; Kornberg & Baker, in: DNA Replication, p. 557-570, W.H. Freeman and Co., New York 1992). Ff phages alone among the bacterial viruses do not produce a lytic infection, but rather induce a state in which the infected host cells produce and secrete phage particles without undergoing lysis. The single-stranded genome of phage M13 encodes 10 different proteins. The DNA is enclosed in a protein coat comprised of approximately 2700 copies of the gene 8 protein (g8p). A viable M13 phage also expresses five copies of the 43 kDa gene 3 protein (g3p) on its tip, which protein is responsible for adsorption to £. coli pili. The gene 3 protein is anchored to the virus coat via the C-terminal part of the polypeptide chain, whereas the N-terminal globular domain is exposed and mediates the attachment of the phage to the tip of a host F pilus. By electron microscopy, the adsorption complex appears as a "knob-on-stem" structure at one end of the phage. During infection, the leader sequences of g3p and g8p direct the transport of these proteins into the inner membrane of the bacterial cell. The Ff phages have gained popularity as cloning vectors because they have no physical constraints limiting the length of DNA that can be packaged and because they allow the easy purification of single-stranded DNA. A phagemid is a vector which carries both the M13 (single-stranded) and plasmid (double-stranded) origins of replication. Phagemids can be grown as plasmids or packaged as recombinant M13 phage with the aid of a helper phage such as M13K07 (Veira & Messing (1987) Methods in Enzymol. 153, 3-11). Recombinant antibody production Antibody molecules contain discrete fragments which can be isolated by protease digestion or produced by recombinant techniques. One such fragment is the Fv (fragment variable) which is composed only of the V L and V H regions of the antibody. In US 4,946,778 a recombinant version of the Fv fragment, designated single-chain Fv (ScFv), is described, where the two variable regions are artificially joined with a neutral linker and expressed as a single polypeptide chain. A technology for recombinant antibody production has been developed by McCafferty and coworkers (McCafferty (1990) Nature 348, 552-554; Winter & Milstein (1991) Nature 349, 293). This approach relies on a phage-display system in which V H (variable heavy) and V L (variable light) genes are cloned into a phage vector whereafter fragments of antibodies are expressed as fusion proteins displayed on the phage surface. With this approach, antibodies of defined specificity and affinity can be selected from a population. It has been suggested that antibodies isolated and manufactured in prokaryotic systems should be called "coliclonal" antibodies (Chiswell & McCafferty (1992) Trends in Biotechnology 10, 80-84). The commercially available phagemid pCANTAB5 is designed such that antibody variable region genes can be cloned between the leader sequence and the main body of the M13 gene 3. The g3p leader sequence directs transport of the resulting fusion protein to the inner membrane and/ or periplasm of E. coli where the main g3p domain attaches the fusion protein to the tip of the assembling phage. The expression of the antibody-g3p gene is controlled by an inducible lac promoter on the phagemid. Helicobacter pylori infection It is widely accepted that the bacterium Helicobacter pylori is the main cause of gastric and duodenal ulcer, responsible for 84% and 95%, respectively, of reported cases (Kuipers, E.L. et al. (1995) Aliment. Pharmacol. Ther. 9 (suppl.2), 59-69). H. pylori colonises the wall of the stomach, protected from the acid environment by a layer of mucus which lines the stomach wall, and by a metabolic process which enables the organism to secrete ammonia to neutralise acid. Conventional antibiotic treatment appears to have little effect on H. pylori. This is probably due to: (i) poor access of the antimicrobial agent to the organism which is not directly exposed to the blood circulation; and (ii) rapid passage of many oral antibiotics through the stomach, or degradation of such antibiotics in the acid conditions of the stomach. PURPOSE OF THE INVENTION The purpose of the present invention is to provide new forms of treatment for eradication of bacteria, especially eradication of bacteria responsible for mucosal bacterial infections such as Helicobacter pylori. In particular, it provides filamentous bacteriophages genetically modified to have binding specificity towards another bacterial host for use in therapy. Methods of treatment of mucosal bacterial infections based on recombinant phages are believed to be superior to conventional antibiotic treatment for several reasons, e.g. the following: • it will be possible to eradicate bacteria resistant to conventional antibiotics; • the high specificity of the recombinant phage towards specific bacterial species; • propagation of the phage is self -limiting; in the case of Helicobacter pylori infections, the motility of Helicobacter pylori could help to distribute the phage to all parts of the gastric mucosa. DISCLOSURE OF THE INVENTION In the present description and examples, the terms "standard protocols" and "standard procedures" are to be understood as protocols and procedures found in an ordinary laboratory manual such as: Sambrook, J., Fritsch, E.F. and Maniatis, T. (1989) Molecular Cloning: A laboratory manual, 2nd Ed., Cold Spring Harbor Laboratory, Cold Spring Harbor, NY. In a first aspect, this invention provides a modified bacteriophage for use in the treatment or prophylaxis of a bacterial infection, which bacteriophage presents at its surface a recombinant protein comprising (i) a first component derived from a bacteriophage surface protein; and (ii) a second component comprising variable region sequences of an antibody to provide a bacterial antigen binding site, said second component rendering said bacteriophage capable of binding to and thereby inhibiting growth of bacterial cells involved in the etiology of said infection. The said modified bacteriophage can e.g. be a modified filamentous phage, such as a modified M13 phage. The said bacterial infection can e.g. be a mucosal bacterial infection such as Helicobacter pylori infection. However, the present invention is not restricted to phages capable of incapacitating Helicobacter pylori cells, but rather comprises phages with altered properties which can be used for incapacitating a wide range of bacteria. It will be understood that a phage according to the invention which is specific for any bacterial species can be prepared by the skilled person on the basis of the present disclosure. Phages according to the invention are suitable for treatment of any mucosal bacterial infection accessible to the outside world. Examples of such mucosal epitheliums are nasal, lung, gastrointestinal tract, urinary bladder and vagina. Examples of other bacterial infections which could be treated with phages according to the invention are: • infections in the urinary tract by E. coli, Staphylococcus saprophyticus, Klebsiella spp, Proteus spp or Pseudomonas aeruginosa; • vaginal infections by Clamydia; • nose/toncillar/lung infections by Streptoccus, Staphylococcus, Haemophilus influence, Pneumococcus or Mycoplasma pneumonic; • infections in the gastrointestinal tract by Salmonella, Shigella, Yersinia, Campylobacter jejuni, Campylobacter coli, Helicobacter, Vibrio cholera or E. coli. The said first component of the recombinant protein mentioned above can preferably be derived from the protein responsible for adsorption of the unmodified form of said bacteriophage to bacterial pili, e.g. the g3p protein from a M13 phage. The said second component of said recombinant protein can e.g. comprise a recombinant single-chain Fv (ScFv) polypeptide. Consequently, the said recombinant protein can e.g. be a g3p - ScFv fusion protein. In a preferred form , the bacteriophage according to the invention is a bacteriophage for use in the treatment or prophylaxis of Helicobacter pylori infection wherein the antibody variable region sequences of said recombinant polypeptide are variable region sequences of a monoclonal antibody selected from the monoclonal antibodies of hybridoma cell lines 5F8 (ECACC No.95121524), 2H6 (ECACC No.95121526) and 5D8 (ECACC No.95121527). Thus, the bacteriophage according to the invention can e.g. be the modified M13 bacteriophage designated B8 deposited at the NCIMB under accession number NCIMB 40779, or a derivative thereof which retains the ability to bind and infect Helicobacter pylori. Phages with the desired properties can be obtained by e.g. one of the following methods: (a) Screening naturally occurring phages, or phage libraries containing phages expressing a multitude of variable antibody fragments. Phage libraries may be obtained e.g. from immune cells, from a large number of individuals. Due to the vast genetic variability, such large phage libraries are likely to comprise the desired, specific phage directed towards bacteria, to which the individuals previously have been exposed. (b) Development of mutations in existing phages. Mutations occur in all living organisms including phages. The frequency of mutations may be increased, e.g. by chemical means or by means of short wavelength electromagnetic irradiation. (c) Directed genetic modification of one or more amino acids, or other modifications of e.g. carbohydrate or lipid components, of the binding region of the phage, in order to increase the desired properties of the natural or recombinant phage. An example of this approach is further described in the experimental section. A bacteriophage according to the invention can thus be produced by a method comprising (a) isolating an antibody against a bacterial cell; (b) isolating the DNA encoding for a variable region of the heavy and light chains of the said antibody; and (c) introducing the said DNA into phage DNA so that the said antibody regions will be expressed on the surface of the phage. In another aspect, the invention provides a pharmaceutical composition comprising a bacteriophage according to the invention in admixture with a pharmaceutically acceptable carrier or excipient. Examples of suitable means of administration of phages according to the invention include: • spray for nasal and lung applications; • pre-treatment with omeprazole followed by phages suspended in bicarbonate buffers for the treatment of gastrointestinal mucosae; • mixtures of muco-adhesive gels (i.e. cellulose-based gels, polycarboph.il, poloxamer etc.) for the gastric mucosa and vaginal mucosa; • bicarbonate buffers for use in the urinary bladder. The number of phages to be administered can be determined by the skilled person. Depending on the type of infection, the number of phages to be administered can range from 10 4 to 10 10 . In yet another aspect, the invention provides a method for treatment of a bacterial infection in a mammal which comprises administering a bacteriophage or pharmaceutical composition according to the invention. The said bacterial infections can e.g. be mucosal bacterial infections such as Helicobacter pylori infections. Included in the invention is also the use of a bacteriophage according to the invention in the manufacture of a medicament for the treatment or prophylaxis of a mucosal bacterial infection, e.g. Helicobacter pylori infections. Further aspects of the invention are a hybridoma selected from 5F8 (ECACC No.95121524), 2H6 (ECACC No.95121526) and 5D8 (ECACC No.95121527), as well as a monoclonal antibody selected from the monoclonal antibodies produced by the said hybridomas. Hybridoma technology, in which antibody-producing B- cells from immunized animals are fused with myeloma cells, and resulting hybridoma cell lines producing the desired antibody are selected, is well known in the art. EXAMPLES EXAMPLE 1: Production of monoclonal antibodies against H. pylori 1.1. Antigen preparation H. pylori strains 17874, 25, 66, 253, and 1139 (obtained from Astra Hassle, Sweden) were cultured on Columbia agar supplemented with 8.5% horse blood, 10% horse serum, 1% isovitalex under microaerophilic condition with Anaerocult C at +37°C. Procedures described by Ma J-Y et al. (1994) Scand. J. Gastroenterol. 29, 961-965, were followed to prepare surface protein of H. pylori. Briefly, a total of 4 g of the five strains of H. pylori were incubated for 15 min at room temperature in 100 ml of 0.2 M glycine-HCl (pH 2.2). The pH was neutralized with 1 M NaOH. The antigen preparation was centrifuged at 10,000 x g for 10 min at +4°C. The pellet was discarded and the supernatant was dialysed overnight against distilled water at +4°C and further used as "H. pylori antigen preparation" or "H. pylori surface proteins". 1.2. Production of monoclonal antibody Immunization procedure was carried out essentially as described by Cabero, J.L. et al. (1992) Acta Physiol. Scand. 144, 369-378. In brief, 2 mg/ml of surface protein of H. pylori was emulsified with an equal volume of Freund's complete adjuvant at +4°C. Two female DBA/1 mice were injected into the hind footpads with single dose of 50 μl of antigen emulsion. 11 days after immunization, lymphocytes from popliteal lymph nodes were fused with mouse myeloma cells (sp2 line) by using 50% (w/w) PEG 4000. The cell fusion suspension was then distributed in five microtiter plates. All cells were grown in DMEM culture medium containing 10% fetal calf serum plus 50 μg/ml gentamycin. 13. Enzyme-linked immunosorbent assay (ELISA) Immunoplates were coated with 50 μl of 0.05 M Na 2 C0 3 /NaHCO- buffer, pH 9.8 containing indicated antigen (10 μg/ml) and incubated overnight at +4°C. Free binding sites were blocked with PBS containing 0.05% Tween-20 (PBS-T) at +37°C for 1 hour. Primary antibody supernatant was added and incubated at +37°C for 1 hour. Goat anti-mouse IgG peroxidase conjugate was used as a secondary antibody. Bound peroxidase was detected with 0.04% (w/v) OPD and 14 mM hydrogen peroxide in 0.1 M citric acid/ 0.2 M NaHP0 4 , pH 5. The plates were read at 492 nm after stopping reaction by adding 2 M H 2 S0 4 . Washing with PBS-T was performed three times between each incubation. 1.4. initial screening From the fusion of lymph node cells and myeloma cells, 45 hybridoma clones were positive against H. pylori surface proteins by ELISA. 8 of them distinctly stained H. pylori taken from agar plate culture by means of immunohistochemistry. Hybridoma clones designated 2H6 (ECACC No. 95121526), 5D8 (ECACC No. 95121527), and 5F8 (ECACC No. 95121524) gave a stronger reaction against H. pylori than others and were chosen for further studies. EXAMPLE 2: Production of recombinant M13 phage against H. pylori 2.1. Materials QuickPrep mRNA purification kit™, Mouse ScFv Module kit™, Expression Module kit™, Detection Module Kit™, S/.I, Notl, T4 DNA ligase and Anti-M13 sheep antibody were obtained from Pharmacia Biotech (Uppsala, Sweden). dNTPs mix, 10 x PCR buffer and AmpliTaq DNA polymerase were purchased from Perkin Elmer. Bacto-yeast extract, Bacto-rryptone, Bacto agar was purchased from Difco Laboratories (Detroit, Michigan USA). Columbia agar plates and brucella broth were obtained from Department of Microbiology (Linkόping University, Sweden). Anaerocult* C was obtained from Merck (Germany). SlowFade™ antifade kit was obtained from Molecular Probes Inc. (U.S.A.). 2.2. Construction of phage antibody library The Recombinant Phage Antibody System™ (Pharmacia) was used to express fragments of antibodies as fusion proteins displayed on the phage surface. Total mRNA was isolated from hybridoma cell lines (2H6, 5D8, and 5F8) and purified by affinity chromatography on oligo(dT)-cellulose, using QuickPrep mRNA Purification Kit™ (Pharmacia). The following steps were performed using the Mouse ScFv Module Kit™: First-strand cDNA was synthesized from hybridoma mRNA by using reverse transcriptase and primer mixes provided with the Mouse ScFv Module Kit™. • cDNA corresponding to the variable regions of the heavy and light chains of mAbs was amplified with different primers (V H and V L chain primers, provided with the kit) by means of polymerase chain reaction (PCR). The V H and V L chains were analyzed by electrophoresis on a 1.5% agarose gel. Single bands at the correct size for V H (340 bp) and V L (325 bp) chain were obtained. • The amplified V H and V L chains were purified and isolated by electrophoresis on a 1% agarose gel and were then assembled into a single-chain Fv (ScFv) gene using a DNA linker fragment provided with the kit. The linker fragment was constructed such that one end annealed to the 3'-end of the heavy chain while the other end hybridized with the 5'-end of the light chain. A single band at correct size for a ScFv gene (750 bp) was observed after electrophoresis. • The assembled antibody ScFv DNA fragment was amplified with a set of oligonucleotide primers (provided with the kit) that introduced Notl and S/l restriction sites. The fragment was purified on a spun column (provided with the kit) to remove linkers, dNTPs and Taq DNA polymerase. The ScFv fragment was digested with Notl and Sfi to generate cohesive ends for ligation to the pCANTAB5 vector. The following steps were performed using the Expression Module Kit™: • The ScFv fragment was ligated to the phagemid vector pCANTAB5 (provided with the kit), previously digested with Notl and Sβl to generate cohesive ends. T4 DNA ligase was used to join the ends of the fragment with corresponding ends of the phagemid. The ScFv fragment was then oriented in the proper direction, adjacent to and in frame with the Ml 3 gene 3, for expression of the ScFv-g3p fusion protein. • £. coli TGI cells (provided with the kit) were made competent and transformed with the recombinant phagemid, containing a lac promoter and an ampicillin resistance marker. The transformed cells were grown at +30°C in a medium containing glucose and ampicillin. 3.2 x 10 4 ScFv clones were obtained. Ampicillin resistant colonies were scraped into medium to generate a library stock. • Ampicillin resistant cells were infected with the helper phage M13K07 (provided with the kit), containing a kanamycin resistance marker, and grown in a glucose-deficient medium containing ampicillin and kanamycin. In the absence of glucose, the lac promotor present on the phagemid was no longer repressed. Phage particles displaying recombinant antibody fragments on their tips were produced and released from the cells. • Phage-displayed antibodies capable of binding H. pylori antigen were selected by panning against the antigen. A culture flask was coated with 5 ml of H. pylori surface protein (15 μg/ml in 50 mM sodium carbonate buffer, pH 9.6) overnight. After three washes with PBS, the flask containing 10 ml of 1% BSA (w/v) in PBS was incubated at +37°C for 1 h. Following three washes with PBS, the flask was incubated at +37°C for 2 h in phage supernatant (medium containing phage). The flask was then washed 20 times with PBS containing 0.1% (w/v) Tween-20 and 20 times with PBS. Bound phage particles were then eluted by adding 1 ml of 100 mM triethvlamine with gentle shaking for 10 min and immediately neutralized with 0.5 ml of 1 M Tris-HCL pH 7.4. The eluted phage was used to infect log-phase E. coli TGI cells on the SOBAG agar containing 2% Bacto-tryptone, 0.5% Bacto-yeast extract, 0.05% NaCl, 0.01 M MgCl 2 , 0.01% glucose and 0.01% ampicillin. Colonies were picked, transferred, grown and rescued again with M13K07. After the first round of selection by counting 100 clones, 6% of clones from the microtiter plate rescue were positive against antigen preparation of H. pylori in an ELISA. In a third round of selection from the microtiter plate rescue, 95% of phage antibodies from individual clones reacted with the H. pylori antigens. In a phage ELISA using the H. pylori antigen preparation as antigen, the recombinant phage B8 has a titre 10-fold higher than the helper phage (wide phage). Phage B8 (NCIMB No. 40779) was chosen for further analysis. EXAMPLE 3: ELISA The phage-displayed recombinant antibodies were detected and identified in an enzyme-linked immunosorbent assay (ELISA), using the Detection Module Kit™. A 96-well micro titre plate was coated with 200 μl of H. pylori antigen (10 μg/ml in 50 mM Na 2 C0 3 /NaHC0 3 , pH 9.6) and incubated overnight at +4°C. The wells were washed widi PBS containing 0.05% Tween 20 (PBS-T) for three times and then blocked with 300 μl of PBS containing 1% BSA for 1 hour at +37°C. Recombinant phage antibodies were diluted with an equal volume of 1% BSA/PBS and incubated for 20 min at room temperature. After washing, 5xl0 10 phage transducing units were added (200 μl/well) and incubated for 2 hours at +37°C. The wells were washed with PBS-T three times and then HRP/ Anti M13 conjugate supplied in the Detection Module kit, diluted 1:5000 in 1% BSA/PBS was added and incubated for 1 hour at +37°C. The wells were washed for three times with PBS-T and then 2'2'-Azino-Bis(3-Ethylbenzthiazoline-6-Sulfonic Acid) Diammonium (ABTS) and H 2 0 2 was added as peroxidase substrate and incubated at room temperature for 30 min. The absorbance was read at 405 run using a computerized ELISA reader. Ovalbumin (10 μg/ml in PBS) was used as control antigen. Helper phage was used as a negative control. The results verified that the recombinant phage B8 specifically bound to the H. pylori surface antigen. EXAMPLE 4: Immunoblotting Proteins of H. pylori antigen preparation were separated by means of poly acrylamide gel electrophoresis in SDS-PAGE (10 μg proteins/ well) and were then transferred to the nitrocellulose paper in a mini trans-blot electrophoretic transfer cell (BioRad, Richmond, CA, USA). The nitrocellulose paper was blocked with 10% BSA in PBS containing 0.1% Tween 20 for 1 h at room temperature with gentle shaking. Phage B8 (10" transducing units/ml) was then added and incubated together with the nitrocellulose paper overnight during gentle shaking at +4°C. Omission of primary antibody was used as a negative control. After washing with PBS-0.1% Tween 20, the nitrocellulose paper was incubated with HRP/anti-M13 conjugate (1:5000 dilution in blocking buffer) for 1 hour with shaking. Detection of binding was carried out by using ECL Detection Kit (Amersham, UK). After staining the nitrocellulose paper with amido black, the major bands corresponded to proteins of 64 kDa, 36 kDa, 31 kDa and 27 kDa. Pooled MAbs (2H6, 5D8, and 5F8 corresponding to the hybridomas used for phage construction) reacted with the bands of 32 kDa and 64 kDa. A similar staining was obtained by immunoblotting with phage antibody B8. This result indicated that the genes of the variable heavy and light chains corresponding to the H. pylori specific monoclonal antibodies were correctly expressed on the phage. EXAMPLE 5: Effects of recombinant phage on bacteria In the following experiments, bacteria were cultured at +37°C in Brucella broth containing 5% fetal calf serum in an atmosphere containing 10% C0 2 and 5% 0 2 . The experiment was started ("Time 0") when 20 μl from the bacterial stock was mixed with 10 ml broth. CFU (colony forming units) per ml culture was determined at the indicated time points by diluting aliquots of the cultures in PBS and spreading the dilutions on agar plates. The plates were incubated for two days at +37°C and the number of colonies of each plate was counted. 5.1. Time-dependent effect The time-dependent effect of the recombinant phage B8 on growth of H. pylori strain 17874 was investigated by measuring CFU for three days with or without phage (Table 1). 10 6 phages were added ("+ Phage") to 10 ml medium at Time 0. In the control ("— Phage") no phages were added. Af er 3 days, CFU had increased about 5 orders of magnitude in the absence of the recombinant phage. After one day in presence of the phage, there was a drop of CFU by about one order of magnitude and the broth culture changed appearance from a turbid to a less turbid solution. 5.2. Effect on various bacterial strains H. pylori laboratory strains 17874, 1139 and 244, together with Staphylococcus aureus, ATCC 29213, and £. coli TGI were cultured with or without phage (10 6 phages to 10 ml medium) for 24 h. CFU was analyzed at Time 0 and at 24 h (Table 2). The recombinant phage decreased CFU of the three H. pylori strains tested but did not affect Staphylococcus or E. coli. H. pylori 17874 was not affected by the helper phage M13K07 used as a control 53. Effect on H. pylori strains In a second experiment (Table 3), H. pylori strains 17874, 1139, 253, 25 and 66 were tested together with Streptococcus (Raf M87). Without phage, CFU increased during the 24 h incubation in all the bacteria tested. However, in culture with the recombinant phage present (10 6 phages to 10 ml medium at Time 0), the CFU values of the H. pylori strains 17874, 1139 and 25 were reduced in number and the growth rate of strains 253 and 66 were strongly reduced compared to the controls. Thus all H. pylori strains tested were affected by the phages. EXAMPLE 6: Immunofluorescent staining of H. pylori Phage antibody B8 was concentrated by PEG precipitation and immunofluorescent staining was performed on the H. pylori (17874 strain) taken from culture. The following stock reagents were prepared to perform immunofluorescent staining: Reagent A: 10 12 transducing units/ml of phage antibodies was diluted 1:1 with 1% BSA/PBS; Reagent B: sheep anti-M13 IgG diluted with 1 % BSA/PBS; Reagent C: anti-sheep IgFITC conjugate dilute 1:100 in 1% BSA/PBS; Reagent D: 1 mg (w/v) of pronase in PBS. Three days after culture, H. pylori (5 different strains), Staphylococcus aureus (ATCC 29213), and Streptococcus (Raf M 87) were separately suspended in PBS containing 1% BSA. 20 μl of each bacteria suspension were added onto glass slides. The bacteria were air dried and fixed in neutral formalin for 2 min, then washed by dipping slides six times into water and air dried at room temperature. Brief treatment in reagent D increased signal-to-noise ratio when sample slides were compared with controls. The slides were consecutively incubated with 30 μl of reagents A, B and C, for 30 min each, and washed in PBS between incubations. The slides were air dried and 1 drop of SlowFade was added before covering. All incubations were performed at room temperature. Negative control was performed by omitting the primary antibody. The results showed that H. pylori was positively stained with phage antibody. The results indicate a good agreement with the CFU values obtained from culture experiments. Thus the expression of a specific antigen on the surface of the bacteria appears to be a prerequisite for execution of the biological effect by phage B8. DEPOSIT OF BIOLOGICAL MATERIAL The following hybridoma clones have been deposited under the Budapest Treaty at the European Collection of Animal Cell Cultures (ECACC), Salisbury, Wiltshire, U.K., on 15 December 1995: 2H6 (ECACC No. 95121526) 5D8 (ECACC No. 95121527) 5F8 (ECACC No. 95121524) The recombinant phage B8 has been deposited under the Budapest Treaty at the National Collections of Industrial and Marine Bacteria (NCIMB), Aberdeen, Scotland, on 20 December 1995 with accession number NCIMB 40779. TABLE 1 TABLE 2 H. pylori Staph. E. coli 17874 1139 244 CFU/ml No phage Oh. 2.1 x10 4 4.7 x10 4 10 4 7.8 x10 7 2.6 x10 6 24 h. 5.8 10 e 1.5x10 7 3.1 x10 5 10' 4.4 x10" Phage B8 Oh. 2.8 x10 4 4.3 x10 4 10 4 2.1 x10 β 2.6 10 6 24 h. 4x10 2 10 2 10 3 8x10 9 4.2x10 β Phage Oh. 3.9 x10 4 (not determined) 13K07 24 h. 4 x10 s (not determined) applicant's or agent's file International application! reference number INDICATIONS RELATING TO A DEPOSITED MICROORKΪ'A l m (PCT Rule 13b«) A. The indications made below relate to the microorganism referred to in Ibe description on page . line ____________________ B. IDENTIFICATION OF DEPOSIT Further deposits are identified on an additional sbeet | ** ~| Name of depositary institution The National Collections of Industπal and Marine Bacteπa (NCIMB) Address of depositary institution (including postal code and country) 23 St. Machar Drive Aberdeen AB2 1RY Scotland, UK Dale of deposit Accession Number 20 December 1995 NCIMB 40779 C. ADDITIONAL INDICATIONS (leave blank if not applicable) This information is continued on an additional sbeet [~ { In respect of all designated states in which such action is possible and to the extent that it is legally permissible under the law of the designated state, it is requested that a sample of the deposited biological mateπal be made available only by issue thererof to an independent expert, in accordance with the relevant patent legislation, e.g. Rule 26(4) EPC, and generally similar provisions mutatis mutandis for any other deisgnated state. D. DESIGNATED STATES FOR WHICH INDICATIONS ARE MADE (if the indications are not for all designated Stales) E- SEPARATE FURNISHING OF INDICATIONS (leave blank if not applicable) Tbe indications listed below will be submitted lo Ibe Inlemational Bureau later (specify Λe general nature of the indications e. ^ Accession Number ofDepaa ') For receiving Office use only For International Bureau use only Ϊ> Tbtt sbeet was received with Ibe international application r_J This sbeel was t*— «»d hv ihe International Bureau on: Authorized officer Authorized officer ø utcέi Foπn PCT/RO 134 (July 1992) INDICATIONS RELATING TO A DEPOSITED MICROORGANISM (PCT Rule I3bis) For International Bureau use only r_J This sheet was received bv the International Bureau on: Authorized officer Applicant's or agent's file Inlemational application.* reference number INDICATIONS RELATING TO A DEPOSITED MICROORGANISM (PCT Rule 13WJ) A. The indicalions made below relate lo Ibe microorganism referred lo in the description 6 .. 30 on page » * ,ne ____________________ B. IDENTIFICATION OF DEPOSIT Further deposits are identified on an additional sbeet | j Name of depositary institution ' The European Collection of Animal Cell Cultures (ECACC) Address of depositary institution (including postal code and country) ECACC, CAMR Porton Down Salisbury, SP4 OJG, UK Date of deposit Accession Number 15 December 1995 ECACC 95121526 C. ADDITIONAL INDICATIONS (leave blank if not applicable) This information is continued on an additional sbeet " ] In respect of all designated states in which such action is possible and to the extent that it is legally permissible under the law of the designated state, it is requested that a sample of the deposited biological material be made available only by issue thererof to an independent expert, in accordance with the relevant patent legislation, e.g. Rule 28(4) EPC, and generally similar provisions mutatis mutandis for any other deisgnated state. D. DESIGNATED STATES FOR WHICH INDICATIONS ARE MADE (if the indications are not for all designated Stales) E. SEPARATE FURNISHING OF INDICATIONS (leave blank if not applicable) Tbe indications listed below ill be submilted to Ibe inlemational Bureau later (specify the general nature of the indicalion « _, 'Accession Number of Deposit') INDICATIONS RELATING TO A DEPOSITED MICROORGANISM (PCT Rule 13fc_.) A. Tbe indications made bejpw relate to Ihe microorganism referred lo iril e description on page __________________ • " ne ___________________ B. IDENTIFICATION OF DEPOSIT Further deposits are identified on an additional sheet f~| Name of depoaitary institution' The European Collection of Animal Cell Cultures (ECACC) Address of depoaitary institution (including ostal code and country) ECACC, CAMR Porton Down Salisbury, SP4 OJG, UK Dale of deposit Accession Number 15 December 1995 ECACC 95121527 C. ADDITIONAL INDICATIONS (leave blank if not applicable) This informalion is continued on an additional sheet [~ | In respect of all designated states in which such action is possible and to the extent that it is legally permissible under the law of the designated state, it is requested that a sample of the deposited biological material be made available only by issue thererof to an independent expert, in accordance with the relevant patent legislation, e.g. Rule 28(4) EPC, and generally similar provisions mutatis mutandis for any other deisgnated state. D. DESIGNATED STATES FOR WHICH INDICATIONS ARE MADE (if the indications are not for all designated Slates) E. SEPARATE FURNISHING OF INDICATIONS (leave blank if not applicable) The indicalions listed belowwill be submilted to tbe International Bureau later (specify Ihe general nature of the indications « _, 'Accession Number of Deposit") For receiving Office use only For International Bureau use only [XI This sbeet was received with die international application \ This sbeet was received by the International Bureau on: Authorized officer Authorized officer ucέi <W m BUDA EST TREATY -N THE IN ERNA IONAL lε ocNiTioN OF THE ΓEPCSIT or MICROORGANISM.: As r-. A3. FOR THE PURPOSES or PATENT PROCEDURE S-151 35 .-.odercalje , Sweden . INTERNATIONAL FORM RECEIPT IN THE CASE OF AN ORICINΛL DEPOSIT issued pursuant to Rule 7.1 by the INTERNATIONAL DEPOSITARY AUTHORITY identic ied at the bottom of. this page IDENTIFICATION OF THE MICROORGANISM Identification reference given by the Accession number given by the DEPOSITOR: INTERNATIONAL DEPOSITARY AUTHORITY: M13 Phage B8 NCIMB 40779 II. SCIENTIFIC DESCRIPTION AND/OR PROPOSED TAXONOKIC DESIGNATION The microorganism identified under I above was accompanied byt I I a scientific deicription I X 1 a proposed taxonomic designation (Mark with a cross where applicable) XII. RECEIPT AND ACCEPTANCE This International Depositary Authority accepts the microorganism identified under I above, vhich was received by it on20 December ∞ t <1 * tβ *' thβ original deposit) 1 IV. RECEIPT OF REQUEST FOR CONVERSION Tlie microorganism identified under I above was received by this International Depoaitary Authority on (date of the original deposit) and a request to convert the original deposit to a deposit under tbe Budapest Treaty was received by it on (date of receipt of request for conversion) V. INTERNATIONAL DEPOSITARY AUTHORITY Name : NCIMB Ltd 83 St Machar Drive Aberdeen Scotlβno Address t l -K AR? * R V Where Rule 6 .4 (d) applies, such date is the date on which the status of internat iona l depos itary author ity was acqui red . Form BP/4 ( sole page) BUDAPEST TREATY Oil THE IirfERNA IONAL KECOCNITION OF THE DEPOSIT OF MICROOHCANISMS FOR THE PURPOSES OF PATENT PROCEDURE INTERNATIONAL FORM [ O RECEIPT IN THE CASE OF AN ORIGINAL DEPOSIT Astra Aktiebolag I issued pursuant to Rule 7.1 by the Patent Department INTERNATIONAL DEPOSITARY AUTHORITY S-151 85 Sodertakje identified at the bottom of this page Sweden NAME AND ADDRESS OF DEPOSITOR _J I. IDENTIFICATION OF THE MICROORGANISM Identi ication reference given by the Accession number given by the DEPOSITOR: INTERNATIONAL DEPOSITARY AUTHORITY: 5F8 95121524 II. SCIENTIFIC DESCRIPTION AND/OR PROPOSED TAXONOMIC DESIGNATION The microorganism identified under I above was accoc-panied by: I X I a scientific description I I a proposed taxonoαic designation (Mark with a crάss where applicable) III. RECEIPT AND ACCEPTANCE This International Depositary Authority accepts the microorganism identified under I above, which was received by it on 15/12/95 (date of the original deposit) 1 IV. RECEIPT OF REQUEST FOR CONVERSION The microorganism identified under I above was received by tbls International Depositary Authority on (date of tbe original deposit) and a request to convert the original deposit to a deposit under tbe Budapest Treaty vaa received by It on (date of receipt of request for conversion) V. INTERNATIONAL DEPOSITARY AUTHORITY Name: Dr a Doyle Signature..) of person(s) having the power to represent the International Depositary ___. __..__, Authority or of authorised officlal(s): ECACC, CAMR, -V__>"* "-* Addreas : Porton Down Date : <_^ * _ * ) R*I .«*___-", « -P_ n.τπ r ΠK- ' v - •> "«> Where Rule 6.4(d) applies, such date is the date on which the status of International depositary authority was acquired. Form BP/4 (sole page) DUDAPEST TREATY ON THE INTERNATIONAL HECOCHITIOH OF THE DEPOSIT OF MICROOIIGANISHS FOR THE PURPOSES OF PATENT PROCEDURE INTERNA IONAL FORM RECEIPT IN THE CASE OF AN ORIGINAL DEPOSIT Astra Aktiebolag I issued pursuant to Rule 7.1 by the Patent Department INTERNATIONAL DEPOSITARY AUTHORITY S-151 85 Sodertakje identified at the bottom of this page Sweden NAME AND ADDRESS OF DEPOSITOR _J I . IDENTIFICATION OF THE MICROORGANISM Identification reference given by the Accession number given by the DEPOSITOR: INTERNATIONAL DEPOSITARY AUTHORITY: 2H6 95121526 II. SCIENTIFIC DESCRIPTION AND/OR PROPOSED TAXONOMIC DESIGNATION The microorganism identified under I above was accompanied by: IX | a scientific description I | a proposed taxono ic designation (Mark with a cross where applicable) II. RECEIPT AND ACCEPTANCE This International Depositary Authority accepts the microorganism identified under I above, which was received by it on 15/12/95 (date of the original deposit) 1 IV. RECEIPT OF REQUEST FOR CONVERSION The microorganism identified under I above was received by this International Depositary Authority, on (date of the original deposit) and a request to convert the original deposit to a deposit under tbe Budapest Treaty was received by It on (date of receipt of xequeat for conversion) INTERNATIONAL DEPOSITARY AUTHORITY Dr a Doyle Signature(s) of pexson(s) having the power to represent the International Depositary Authority or of authorised offlcial(s): ECACC, CAMR, Address: Porton Down 5._.H«.hιιry, . P_i rUf., JI . ___-^ / .*5»_ Where Rule 6.4(d) applies, such date is the date on which the status of international depositary authority was acquired. Form BP/4 (sole page) BUDAPEST TREATY ON THE INTERNATIONAL RECOGNITION OF THE DEPOSIT OF MICROOl.CAMISMS FOR THE PURPOSES OF PATENT PROCEDURE INTERNATIONAL FORM RECEIPT IN THE CASE OF AN ORIGINAL DEPOSIT Astra Aktiebolag I issued pursuant to Rule 7.1 by the Patent Department INTERNATIONAL DEPOSITARY AUTHORITY S-151 85 Sodertakje identified at the bottom of this page Sweden NAME AND ADDRESS OF DEPOSITOR _l 1 here Rule 6.4(d) applies, such date is the date on which the status of international depositary authority was acquired. Form BP/4 (sole page)

Claims: CLAIMS 1. A modified bacteriophage for use in the treatment or prophylaxis of a bacterial infection, which bacteriophage presents at its surface a recombinant protein comprising (i) a first component derived from a bacteriophage surface protein; and (ii) a second component comprising variable region sequences of an antibody to provide a bacterial antigen binding site, said second component rendering said bacteriophage capable of binding to and thereby inhibiting growth of bacterial cells involved in the etiology of said infection. 2. A bacteriophage as claimed in claim 1 for use in the treatment or prophylaxis of a mucosal bacterial infection. 3. A bacteriophage as claimed in claini 2 for use in the treatment or prophylaxis of Helicobacter pylori infection. 4. A bacteriophage as claimed in any one of claims 1 to 3 which is a modified filamentous bacteriophage. 5. A bacteriophage as claimed in any one of claims 1 to 4 which is a modified M13 bacteriophage. 6. A bacteriophage as claimed in any one of claims 1 to 5 wherein said first component of said recombinant protein is derived from the protein responsible for adsorption of the unmodified form of said bacteriophage to bacterial pili. 7. A bacteriophage as claimed in any one of claims 1 to 6 wherein said second component of said recombinant protein comprises a ScFv polypeptide. 8. A bacteriophage as claimed in any one of claims 1 to 7 which is a modified M13 bacteriophage wherein said first component of said recombinant protein is derived from the g3p protein. 9. A bacteriophage as claimed in claim 8 wherein said recombinant protein is a g3p - ScFv fusion protein. 10. A bacteriophage as claimed in any one of claims 1 to 9 for use in the treatment or prophylaxis of Helicobacter pylori infection wherein the antibody variable region sequences of said recombinant polypeptide are variable region sequences of a monoclonal antibody selected from the monoclonal antibodies of hybridoma cell lines 5F8 (ECACC No.95121524), 2H6 (ECACC No.95121526) and 5D8 (ECACC No.95121527). 11. The modified M13 bacteriophage of claim 10 designated B8 deposited at the NCIMB under accession number NCIMB 40779, or a derivative thereof which retains the ability to bind and infect Helicobacter pylori. 12. A pharmaceutical composition comprising a bacteriophage as claimed in any one of the preceding claims in admixture with a pharmaceutically acceptable carrier or excipient. 13. A method for treatment of a bacterial infection in a mammal which comprises administering a bacteriophage or pharmaceutical composition according to any one of the preceding claims. 14. Use of a bacteriophage as claimed in any one of claims 1 to 11 in the manufacture of a medicament for the treatment or prophylaxis of a mucosal bacterial infection. 15. A hybridoma selected from 5F8 (ECACC No.95121524), 2H6 (ECACC No.95121526) and 5D8 (ECACC No.95121527). 16. A monoclonal antibody selected from the monoclonal antibodies produced by the hybridomas according to claim 15.

Inventors: MAARDH SVEN, MAARDH, SVEN
Applicants: MAARDH SVEN, MAARDH, SVEN
Application year: 1997
Main classification: C12N7
IPC codes: A61K35, A61K38, A61K47, C07K14, C07K16, C12N7