Pyridoxal phosphate - wikipedia Pyridoxal phosphate Pyridoxal phosphate Names IUPAC name ( 4 - formyl - 5 - hydroxy - 6 - methylpyridin - 3 - yl ) methyl phosphate Other names Pyridoxal 5 - phosphate, PAL - P, PLP, Vitamin B6 phosphate Identifiers CAS Number 54 - 47 - 7 3D model ( JSmol ) Interactive image ChEBI CHEBI : 18405 ChEMBL ChEMBL82202 ECHA InfoCard 100.000. 190 IUPHAR / BPS 5249 MeSH Pyridoxal + Phosphate PubChem CID 1051 SMILES O = Cc1c ( O ) c ( C ) ncc1COP ( O ) ( O ) = O Properties Chemical formula C H NO P Molar mass 247.142 g / mol Density 1.638 ± 0.06 g / cm3 Melting point 139 to 142 ° C ( 282 to 288 ° F ; 412 to 415 K ) Acidity ( pK ) 1.56 Pharmacology ATC code A11HA06 ( WHO ) Hazards Flash point 296.0 ± 32.9 ° C Except where otherwise noted, data are given for materials in their standard state ( at 25 ° C ( 77 ° F ), 100 kPa ). N verify ( what is ? ) Infobox references Pyridoxal phosphate ( PLP, pyridoxal 5 ' - phosphate, P5P ), the active form of vitamin B, is a coenzyme in a variety of enzymatic reactions. The Enzyme commission has catalogued more than 140 PLP - dependent activities, corresponding to ~ 4 % of all classified activities. The versatility of PLP arises from its ability to covalently bind the substrate, and then to act as an electrophilic catalyst, thereby stabilizing different types of carbanionic reaction intermediates. Contents 1 Role as a coenzyme 2 Non-classical examples of PLP 3 Catalytic mechanism 4 Specificity 5 PLP - enzymes 6 Biosynthesis 6.1 From vitamers 6.2 Prototrophy 6.2. 1 DXP - dependent biosynthesis 6.2. 2 DXP - independent biosynthesis 6.3 Prebiotic synthesis 7 Inhibitors 8 See also 9 References 10 External links Role as a coenzyme PLP acts as a coenzyme in all transamination reactions, and in certain decarboxylation, deamination, and racemization reactions of amino acids. The aldehyde group of PLP forms a Schiff - base linkage ( internal aldimine ) with the ε - amino group of a specific lysine group of the aminotransferase enzyme. The α - amino group of the amino acid substrate displaces the ε - amino group of the active - site lysine residue in a process known as transaldimination. The resulting external aldimine can lose a proton, carbon dioxide, or an amino acid sidechain to become a quinoid intermediate, which in turn can act as a nucleophile in several reaction pathways. In transamination, after deprotonation the quinoid intermediate accepts a proton at a different position to become a ketimine. The resulting ketimine is hydrolysed so that the amino group remains on the complex. In addition, PLP is used by aminotransferases ( or transaminases ) that act upon unusual sugars such as perosamine and desosamine. In these reactions, the PLP reacts with glutamate, which transfers its alpha - amino group to PLP to make pyridoxamine phosphate ( PMP ). PMP then transfers its nitrogen to the sugar, making an amino sugar. PLP is also involved in various beta - elimination reactions such as the reactions carried out by serine dehydratase and GDP - 4 - keto - 6 - deoxymannose - 3 - dehydratase ( ColD ). It is also active in the condensation reaction in heme synthesis. PLP plays a role in the conversion of levodopa into dopamine, facilitates the conversion of the excitatory neurotransmitter glutamate to the inhibitory neurotransmitter GABA, and allows SAM to be decarboxylated to form propylamine, which is a precursor to polyamines. Non-classical examples of PLP PLP is also found on glycogen phosphorylase in the liver, where it is used to break down glycogen in glycogenolysis when glucagon or epinephrine signals it to do so. However, this enzyme does not exploit the reactive aldehyde group, but instead utilizes the phosphate group on PLP to perform its reaction. Although the vast majority of PLP - dependent enzymes form an internal aldimine with PLP via an active site lysine residue, some PLP - dependent enzymes do not have this lysine residue, but instead have a histidine in the active site. In such a case, the histidine can not form the internal aldimine, and, therefore, the co-factor does not become covalently tethered to the enzyme. GDP - 4 - keto - 6 - deoxymannose - 3 - dehydratase ( ColD ) is an example of such an enzyme. Catalytic mechanism The pyridoxal - 5 ′ - phosphate - dependent enzymes ( PLP enzymes ) catalyze myriad biochemical reactions. Although the scope of PLP - catalyzed reactions appears to be immensely diverse, there is a simple unifying principle : in the resting state, the co-factor ( PLP ) is covalently bonded to the amino group of an active site lysine, forming an internal aldimine. Once the amino substrate interacts with the active site, a new Schiff base is generated, commonly referred to as the external aldimine. After this step, the mechanistic pathway for each PLP - catalyzed reaction diverges. Density functional methods have been applied to investigate the transimination reaction, and the results have shown that the reaction involves three sequential steps : ( i ) formation of a tetrahedral intermediate with the active site lysine and the amino substrate bonded to the PLP co-factor ; ( ii ) non-direct proton transfer between the amino substrate and the lysine residue ; and ( iii ) formation of the external aldimine after the dissociation of the lysine residue. The overall reaction is exothermic ( − 12.0 kcal / mol ), the second step being rate - limiting, with 12.6 kcal / mol for the activation energy Mechanistic examples : racemization of alanine and elimination of cysteine. Specificity Specificity is conferred by the fact that, of the four bonds of the alpha - carbon of the amino acid aldimine state, the bond perpendicular to the pyridine ring will be broken ( Dunathan Stereoelectronic Hypothesis ). Consequently, specificity is dictated by how the enzymes bind their substrates. An additional role in specificity is played by the ease of protonation of the pyridine ring nitrogen. PLP - enzymes PLP is retained in the active site not only thanks to the lysine, but also thanks to the interaction of the phosphate group and a phosphate binding pocket and to a lesser extent thanks to base stacking of the pyridine ring with an overhanging aromatic residue, generally tyrosine ( which may also partake in the acid -- base catalysis ). Despite the limited requirements for a PLP binding pocket, PLP enzymes belong to only five different families. These families do not correlate well with a particular type of reaction. The five families are classified as fold types followed by a Roman numeral. Fold Type I -- aspartate aminotransferase family Fold Type II -- tryptophan synthase family Fold Type III -- alanine racemase family ( TIM - barrel ) Fold Type IV -- D - amino acid aminotransferase family Fold Type V -- glycogen phosphorylase family Biosynthesis From vitamers Animals are auxotrophs for this enzyme co-factor and require it or an intermediate to be supplemented, hence its classification as a vitamin B, unlike MoCo or CoQ10 for example. PLP is synthesized from pyridoxal by the enzyme pyridoxal kinase, requiring one ATP molecule. PLP is metabolized in the liver. Prototrophy Two natural pathways for PLP are currently known : one requires deoxyxylulose 5 - phosphate ( DXP ), while the other does not, hence they are known as DXP - dependent and DXP - independent. These pathways have been studied extensively in Escherichia coli and Bacillus subtilis, respectively. Despite the disparity in the starting compounds and the different number of steps required, the two pathways possess many commonalities. DXP - dependent biosynthesis The DXP - dependent biosynthetic route requires several steps and a convergence of two branches, one producing 3 - hydroxy - 1 - aminoacetone phosphate from erythrose 4 - phosphate, while the other ( single enzyme ) producing deoxyxylulose 5 - phosphate ( DXP ) from glyceraldehyde 3 - phosphate ( GAP ) and pyruvate. The condensation product of 3 - hydroxy - 1 - aminoacetone phosphate and deoxyxylulose 5 - phosphate is pyridoxine 5 ' - phosphate. The condensation is catalyzed by PNP synthase, encoded by pdxJ, which creates PNP ( pyridoxine 5 ' phosphate ). The final enzyme is PNP oxidase ( pdxH ), which catalyzes the oxidation of the 4 ' hydroxyl group to an aldehyde using dioxigen, resulting in hydrogen peroxide. The first branch is catalyzed in E. coli by enzymes encoded by epd, pdxB, serC and pdxA. These share mechanistical similarities and homology with the three enzymes in serine biosynthesis ( serA ( homologue of pdxB ), serC, serB &emdash ; however, epd is a homologue of gap ), which points towards a shared evolutionary origin of the two pathways. In several species there are two homologues of the E. coli serC gene, generally one in a ser operon ( serC ), and the other in a pdx operon, in which case it is called pdxF. A `` serendipitous pathway '' was found in an overexpression library that could suppress the auxotrophy caused by the deletion of pdxB ( encoding erythronate 4 phosphate dehydrogenase ) in E. coli. The serendipitous pathway was very inefficient, but was possible due to the promiscuous activity of various enzymes. It started with 3 - phosphohydroxypyruvate ( the product of the serA - encoded enzyme in serine biosynthesis ) and did not require erythronate - 4 - phosphate. 3PHP was dephosphorylated, resulting in an unstable intermediate that decarboxylates spontaneously ( hence the presence of the phosphate in the serine biosynthetic pathway ) to glycaldehyde. Glycaldehyde was condensed with glycine and the phosphorylated product was 4 - phosphohydroxythreonine ( 4PHT ), the canonical substate for 4 - PHT dehydrogenase ( pdxA ). DXP - independent biosynthesis The DXP - independent PLP - biosynthetic route consists of a step catalyzed by PLP - synthase, an enzyme composed of two subunits. PdxS catalyzes the condensation of ribulose 5 - phosphate, glyceraldehyde - 3 - phosphate, and ammonia, this latter molecules is produced by PdxT which catalyzes the production of ammonia from glutamine. PdxS is a ( β / α ) 8 barrel ( also known as a TIM - barrel ) that forms a dodecamer. Prebiotic synthesis The widespread utilization of PLP in central metabolism, especially in amino acid biosynthesis, and its activity in the absence of enzymes, suggests PLP may be a prebiotic compound. In fact, heating NH3 and glycoaldehyde spontaneously forms a variety of pyridines, including pyridoxal. Under certain conditions, PLP is formed from cyanoacetylene, diacetylene, carbon monoxide, hydrogen, water, and a phosphoric acid. Inhibitors Several inhibitors of PLP enzymes are known. One type of inhibitor forms an electrophile with PLP, causing it to irreversibly react with the active site lysine. Acetylenic compounds ( e.g. propargylglycine ) and vinylic compounds ( e.g. vinylglycine ) are such inhibitors. A different type of inhibitor inactivates PLP, and such are α - methyl and amino - oxy substrate analogs ( e.g. α - methylglutamate ). Other inhibitors have good leaving groups that nucleophilically attack the PLP. Such is chloroalanine, which inhibits a large number of enzymes. Examples of inhibitors : AlaP ( alanine phosphonate ) inihibits alanine racemases, but its lack of specificity has prompted further designs of ALR inhibitors. Gabaculine and Vigabatrin inhibit GABA aminotransferase Canaline and 5 - fluoromethylornithine inhibit ornithine aminotransferase Amino - oxy SAM inhibits ACC synthase See also Aromatic - L - amino - acid decarboxylase Ornithine decarboxylase References ^ Jump up to : Calculated using Advanced Chemistry Development ( ACD / Labs ) Software V11. 02 ( © 1994 - 2011 ACD / Labs ) Jump up ^ Kozlov E.I., L.M.S. Stability of water - soluble vitamins and coenzymes. Hydrolysis of pyridoxal - 5 - phosphate in acidic, neutral, and weakly alkaline solutions. Pharmaceutical Chemistry Journal 1978, 11, 1543. Jump up ^ Percudani R1, Peracchi A. ( 2003 ). `` Genomic overview of pyridoxal - phosphate - dependent enzymes ''. EMBO Rep. 4 ( 9 ) : 850 -- 4. doi : 10.1038 / sj. embor. embor914. PMC 1326353. PMID 12949584. Jump up ^ David Dolphin, R Poulson, and O Avramovic. Vitamin B6 : Pyridoxal Phosphate Volume 1, Part B, Coenzymes and Cofactors. Wiley Interscience, New YorkYear : 1986 ISBN 978 - 0471097853. Preface. Jump up ^ Toney, M.D. `` Reaction specificity in pyridoxal enzymes. '' Archives of biochemistry and biophysics ( 2005 ) 433 : 279 - 287. ^ Jump up to : Samuel, G. and Reeves, P. `` Biosynthesis of O - antigens : genes and pathways involved in nucleotide sugar precusor synthesis and O - antigen assembly. '' Carbohydrate research ( 2003 ) 338 : 2503 - 2519. Jump up ^ Cook P.D., Thoden J.B. and Holden H.M. `` The structure of GDP - 4 - keto - 6 - deoxymannose - 3 - dehydratase : a unique coenzyme B6 - dependent enzyme. '' Protein Science ( 2006 ) 15 : 2093 - 2106. Jump up ^ N.M.F.S.A. Cerqueira, P.A. Fernandes, M.J. Ramos ( 2011 ). `` Computational Mechanistic Studies Addressed to the Transimination Reaction Present in All Pyridoxal 5 ′ - Phosphate - Requiring Enzymes ''. Journal of Chemical Theory and Computation. 7 ( 5 ) : 1356 -- 1368. doi : 10.1021 / ct1002219. CS1 maint : Multiple names : authors list ( link ) ^ Jump up to : Eliot, A.C. ; Kirsch, J.F. ( 2004 ). `` PYRIDOXALPHOSPHATEENZYMES : Mechanistic, Structural, and Evolutionary Considerations ''. Annual Review of Biochemistry. 73 : 383 -- 415. doi : 10.1146 / annurev. biochem. 73.011303. 074021. PMID 15189147. Jump up ^ Griswold, W.R. ; Toney, M.D. ( 2011 ). `` Role of the Pyridine Nitrogen in Pyridoxal 5 ′ - Phosphate Catalysis : Activity of Three Classes of PLP Enzymes Reconstituted with Deazapyridoxal 5 ′ - Phosphate ''. Journal of the American Chemical Society. 133 ( 37 ) : 14823 -- 14830. doi : 10.1021 / ja2061006. PMID 21827189. Jump up ^ Fitzpatrick, T.B. ; Amrhein, N. ; Kappes, B. ; Macheroux, P. ; Tews, I. ; Raschle, T. ( 2007 ). `` Two independent routes of de novo vitamin B6 biosynthesis : Not that different after all ''. Biochemical Journal. 407 ( 1 ) : 1 -- 13. doi : 10.1042 / BJ20070765. PMID 17822383. Jump up ^ Sakai, A. ; Kita, M. ; Tani, Y. ( 2004 ). `` Recent progress of vitamin B6 biosynthesis ''. Journal of Nutritional Science and Vitaminology. 50 ( 2 ) : 69 -- 77. doi : 10.3177 / jnsv. 50.69. PMID 15242009. Jump up ^ Lam, H.M. ; Winkler, M.E. ( 1990 ). `` Metabolic relationships between pyridoxine ( vitamin B6 ) and serine biosynthesis in Escherichia coli K - 12 ''. Journal of Bacteriology. 172 ( 11 ) : 6518 -- 6528. PMC 526841. PMID 2121717. Jump up ^ Kim, J. ; Kershner, J.P. ; Novikov, Y. ; Shoemaker, R.K. ; Copley, S.D. ( 2010 ). `` Three serendipitous pathways in E. Coli can bypass a block in pyridoxal - 5 ′ - phosphate synthesis ''. Molecular Systems Biology. 6 : 436. doi : 10.1038 / msb. 2010.88. PMC 3010111. PMID 21119630. Jump up ^ Zhu, J. ; Burgner, J.W. ; Harms, E. ; Belitsky, B.R. ; Smith, J.L. ( 2005 ). `` A New Arrangement of ( α / β ) 8 Barrels in the Synthase Subunit of PLP Synthase ''. Journal of Biological Chemistry. 280 ( 30 ) : 27914 -- 27923. doi : 10.1074 / jbc. M503642200. PMID 15911615. ^ Jump up to : Austin, S.M. ; Waddell, T.G. ( 1999 ). `` Prebiotic synthesis of vitamin B6 - type compounds ''. Origins of life and evolution of the biosphere : the journal of the International Society for the Study of the Origin of Life. 29 ( 3 ) : 287 -- 296. PMID 10389266. Jump up ^ Aylward, N. ; Bofinger, N. ( 2006 ). `` A plausible prebiotic synthesis of pyridoxal phosphate : Vitamin B6 -- A computational study ''. Biophysical Chemistry. 123 ( 2 -- 3 ) : 113 -- 121. doi : 10.1016 / j. bpc. 2006.04. 014. PMID 16730878. Jump up ^ Anthony, K.G. ; Strych, U. ; Yeung, K.R. ; Shoen, C.S. ; Perez, O. ; Krause, K.L. ; Cynamon, M.H. ; Aristoff, P.A. ; Koski, R.A. ( 2011 ). Ahmed, Niyaz, ed. `` New Classes of Alanine Racemase Inhibitors Identified by High - Throughput Screening Show Antimicrobial Activity against Mycobacterium tuberculosis ''. PLoS ONE. 6 ( 5 ) : e20374. doi : 10.1371 / journal. pone. 0020374. PMC 3102704. PMID 21637807. External links A11HA06 ( WHO ) Vitamins ( A11 ) Fat soluble α - Carotene β - Carotene Retinol Tretinoin Ergosterol Ergocalciferol 7 - Dehydrocholesterol Previtamin D Cholecalciferol 25 - hydroxycholecalciferol Calcitriol ( 1, 25 - dihydroxycholecalciferol ) Calcitroic acid Dihydroergocalciferol D analogues Alfacalcidol Dihydrotachysterol Calcipotriol Tacalcitol Paricalcitol Tocopherol Alpha Beta Gamma Delta Tocotrienol Alpha Beta Gamma Delta Tocofersolan Naphthoquinone Phylloquinone ( K ) Menaquinones ( K ) Menadione ( K ) ‡ Menadiol ( K ) Water soluble Thiamine B analogues Acefurtiamine Allithiamine Fursultiamine Octotiamine Prosultiamine Sulbutiamine Riboflavin Niacin Nicotinamide Pantothenic acid Dexpanthenol Pantethine Pyridoxine, Pyridoxal phosphate Pyridoxamine Pyritinol Biotin Folic acid Dihydrofolic acid Folinic acid Levomefolic acid Adenosylcobalamin Cyanocobalamin Hydroxocobalamin Methylcobalamin Choline Ascorbic acid Dehydroascorbic acid Combinations Multivitamins WHO - EM Withdrawn from market Clinical trials : Phase III Never to phase III Enzyme cofactors Active forms vitamins TPP / ThDP ( B ) FMN, FAD ( B ) NAD, NADH, NADP, NADPH ( B ) Coenzyme A ( B ) PLP / P5P ( B ) Biotin ( B ) THFA / H FA, DHFA / H FA, MTHF ( B ) AdoCbl, MeCbl ( B ) Ascorbic acid ( C ) Phylloquinone ( K ), Menaquinone ( K ) Coenzyme F420 non-vitamins ATP CTP SAMe PAPS GSH Coenzyme B Cofactor F430 Coenzyme M Coenzyme Q Heme / Haem ( A, B, C, O ) Lipoic Acid Methanofuran Molybdopterin / Molybdenum cofactor PQQ THB / BH THMPT / H MPT metal ions Ca Cu Fe, Fe Mg Mn Mo Ni Zn Base forms vitamins : see vitamins Retrieved from `` https://en.wikipedia.org/w/index.php?title=Pyridoxal_phosphate&oldid=824115830 '' Categories : B vitamins Organophosphates Hidden categories : CS1 maint : Multiple names : authors list Articles without InChI source Chemical pages without ChemSpiderID Articles without KEGG source Articles without UNII source Articles with changed EBI identifier ECHA InfoCard ID from Wikidata Articles containing unverified chemical infoboxes Chembox image size set Talk Contents About Wikipedia تۆرکجه Català Deutsch Español فارسی Français Italiano Magyar 日本 語 Polski Русский Српски / srpski Srpskohrvatski / српскохрватски Suomi 中文 Edit links This page was last edited on 5 February 2018, at 12 : 11. Text is available under the Creative Commons Attribution - ShareAlike License ; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia ® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization. About Wikipedia

Question: where is vitamin b6 activated to form its active form pyridoxal phosphate (plp)
Answer: the ε-amino group of a specific lysine group of the aminotransferase enzyme