U.S. flagAn official website of the United States government
                    Here's how you know **Official websites use .gov**
                            
                            A **.gov** website belongs to an official government organization in the United States.
 **Secure .gov websites use HTTPS**
                            
                            A **lock** (                            
                              A locked padlock                                                      
                            
                            ) or **https://** means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.


Menu Agricultural Research Service
						
                    U.S. DEPARTMENT OF AGRICULTURE
 Produce Safety and Microbiology Research: Albany, CA
 close



    Research

                    Research Projects
                                    Publications
                                    Collaborations
                                    News
                People

                    Staff Listing
                                    CareersSearch small
                    Search
            
            ARS Home
                                About ARS
                                Contact Us




ARS Home Pacific West Area Albany, California Western Regional Research Center Produce Safety and Microbiology Research People & Locations







Clifton  Fagerquist

(Keith)
                        Produce Safety and Microbiology Research

                        




                        
                        Research Chemist
                        Phone: (510) 559-5691
                        
                        
                        Fax: (510) 559-6162(Employee information on this page comes from the REE Directory. Please contact your front office staff to update the REE Directory.)
                            ProjectsElucidating the Factors that Determine the Ecology of Human Pathogens in Foods
                                                    In-House Appropriated
                                                                    (D)Accession Number: 440168**Publications**
                                                (Clicking on the reprint icon
                                                    Reprint Icon
                                                    will take you to the publication reprint.)Exploring the fragmentation efficiency of proteins analyzed by MALDI-TOF-TOF tandem mass spectrometry using computational and statistical analyses

- (Peer Reviewed Journal)Plasmid-encoded colicin immunity proteins produced by pathogenic Escherichia coli identified by antibiotic induction, MALDI-TOF-TOF-MS/MS and top-down proteomic analysis

- (Abstract Only)Unusual modifications of protein biomarkers expressed by plasmid, prophage and bacterial host of pathogenic E. coli identified by top-down proteomic analysis
                                                        

- (Peer Reviewed Journal)Fagerquist, C.K., Shi, Y., Park, J. 2023. Unusual modifications of protein biomarkers expressed by plasmid, prophage and bacterial host of pathogenic E. coli identified by top-down proteomic analysis. Rapid Communications in Mass Spectrometry. 38(1):1-16. https://doi.org/10.1002/rcm.9667.Top-down proteomic identification of plasmid-encoded immunity proteins from pathogenic bacteria using MALDI-TOF-TOF tandem mass spectrometry

- (Abstract Only)Understanding gas phase dissociation of singly charged metastable protein ions generated by MALDI using protein structures predicted by Alphafold2

- (Abstract Only)Top-down proteomic identification of protein biomarkers of Xylella fastidiosa subsp. fastidiosa using MALDI-TOF-TOF-MS and MS/MS
                                                        

- (Peer Reviewed Journal)Fagerquist, C.K., Wallis, C.M., Chen, J. 2023. Top-down proteomic identification of protein biomarkers of Xylella fastidiosa subsp. fastidiosa using MALDI-TOF-TOF-MS and MS/MS. International Journal of Mass Spectrometry. 489. Article 117051. https://doi.org/10.1016/j.ijms.2023.117051.Toxin and phage production from pathogenic E. coli by antibiotic induction analyzed by chemical reduction, MALDI-TOF-TOF mass spectrometry and top-down proteomic analysis
                                                        

- (Peer Reviewed Journal)Fagerquist, C.K., Shi, Y., Dodd, C.E. 2023. Toxin and phage production from pathogenic E. coli by antibiotic induction analyzed by chemical reduction, MALDI-TOF-TOF mass spectrometry and top-down proteomic analysis. Rapid Communications in Mass Spectrometry. 37(10). Article e9505. https://doi.org/10.1002/rcm.9505.Biofilm of pathogenic bacteria analyzed by MALDI-TOF imaging mass spectrometry (IMS) and top-down proteomic identification

- (Abstract Only)Using protein structures predicted by Alphafold2 to understand the fragmentation of proteins from pathogenic bacteria analyzed by MALDI-TOF-TOF-MS/MS

- (Abstract Only)Identification of protein biomarkers of Xylella fastidiosa using MALDI-TOF-TOF-MS/MS and top-down proteomic analysis

- (Proceedings)Fagerquist, C.K., Wallis, C.M., Chen, J. 2022. Identification of protein biomarkers of Xylella fastidiosa using MALDI-TOF-TOF-MS/MS and top-down proteomic analysis. Proceedings of the ASMS Conference on Mass Spectrometry and Allied Topics. ID 310588.Identification of protein biomarkers of Xylella fastidiosa using MALDI-TOF-TOF-MS/MS and top-down proteomic analysis

- (Abstract Only)Top-down identification of Shiga toxin (and other virulence factors and biomarkers) from pathogenic E. coli using MALDI-TOF-TOF tandem mass spectrometry
                                                        

- (Book / Chapter)Fagerquist, C.K. 2023. Top-down identification of Shiga toxin (and other virulence factors and biomarkers) from pathogenic E. coli using MALDI-TOF/TOF tandem mass spectrometry. In: Shah, H.N., Gharbia, S.E., Shah, A.J., Tranfield, E.Y., Thompson, K.C., editors. Microbiological Identification Using MALDI-TOF and Tandem Mass Spectrometry: Industrial and environmental applications. 1st edition. West Sussex, UK: John Wiley & Sons Ltd. p. 71-96. https://doi.org/10.1002/9781119814085.ch3.Top-down proteomic identification of plasmid and host proteins produced by pathogenic Escherichia coli using MALDI-TOF-TOF tandem mass spectrometry
                                                        

- (Peer Reviewed Journal)Fagerquist, C.K., Dodd, C.E. 2021. Top-down proteomic identification of plasmid and host proteins produced by pathogenic Escherichia coli using MALDI-TOF-TOF tandem mass spectrometry. PLoS ONE. 16(11). Article e0260650. https://doi.org/10.1371/journal.pone.0260650.Top-down proteomic identification of Shiga toxin and acid-stress proteins from pathogenic Escherichia coli using antibiotic induction and MALDI-TOF-TOF-MS/MS

- (Proceedings)Fagerquist, C.K., Dodd, C.E. 2021. Top-down proteomic identification of Shiga toxin and acid-stress proteins from pathogenic Escherichia coli using antibiotic induction and MALDI-TOF-TOF-MS/MS [abstract]. Proceedings of the 69th ASMS Conference on Mass Spectrometry and Allied Topics. Citation ID: 305536. Session: Microorganisms and the Microbiome (Remote Posters).Sequestration of the ionizing proton in singly charged metastable protein ions generated by MALDI
                                                        

- (Peer Reviewed Journal)Fagerquist, C.K., Dodd, C.E. 2021. Sequestration of the ionizing proton in singly charged metastable protein ions generated by MALDI. International Journal of Mass Spectrometry. 471. Article 116736. https://doi.org/10.1016/j.ijms.2021.116736.Top-down proteomic identification of Shiga toxin and acid-stress proteins from pathogenic Escherichia coli using antibiotic induction and MALDI-TOF-TOF-MS/MS

- (Abstract Only)Identification of antibacterial immunity proteins in Escherichia coli using MALDI-TOF-TOF-MS/MS and top-down proteomic analysis
                                                        

- (Peer Reviewed Journal)Fagerquist, C.K., Rojas, E.N. 2021. Identification of antibacterial immunity proteins in Escherichia coli using MALDI-TOF-TOF-MS/MS and top-down proteomic analysis. Journal of Visualized Experiments. 171. Article e62577. https://doi.org/10.3791/62577.Top-down proteomic identification of plasmid and host proteins produced by pathogenic Escherichia coli using MALDI-TOF-TOF tandem mass spectrometry

- (Abstract Only)Dodd, C.E., Fagerquist, C.K. 2021. Top-down proteomic identification of plasmid and host proteins produced by pathogenic Escherichia coli using MALDI-TOF-TOF tandem mass spectrometry [abstract]. World Microbe Forum. Available: https://www.abstractsonline.com/pp8/#!/9286/presentation/11668.Polypeptide backbone cleavage on the C-terminal side of asparagine residues of metastable protein ions analyzed by MALDI-TOF-TOF-MS/MS and post-source decay
                                                        

- (Peer Reviewed Journal)Fagerquist, C.K. 2020. Polypeptide backbone cleavage on the C-terminal side of asparagine residues of metastable protein ions analyzed by MALDI-TOF-TOF-MS/MS and post-source decay. International Journal of Mass Spectrometry. 457:116433. https://doi.org/10.1016/j.ijms.2020.116433.Detection and identification of a protein biomarker in antibiotic resistant Escherichia coli using intact protein LC offline MALDI-MS and MS/MS
                                                        

- (Peer Reviewed Journal)Maus, A., Bisha, B., Fagerquist, C.K., Basile, F. 2019. Detection and identification of a protein biomarker in antibiotic resistant Escherichia coli using intact protein LC offline MALDI-MS and MS/MS. Journal of Applied Microbiology. 128(3):697-709. https://doi.org/10.1111/jam.14507.Top-down proteomic identification of Shiga toxin 1 and 2 from pathogenic Escherichia coli using MALDI-TOF-TOF tandem mass spectrometry
                                                        

- (Peer Reviewed Journal)Fagerquist, C.K., Zaragoza, W.J., Carter, M.Q. 2019. Top-down proteomic identification of Shiga toxin 1 and 2 from pathogenic Escherichia coli using MALDI-TOF-TOF tandem mass spectrometry. Microorganisms. 7(488):1-14. https://doi.org/10.3390/microorganisms7110488.Typing/subtyping Shiga toxin from pathogenic Escherichia coli using MALDI-TOF-TOF tandem mass spectrometry and top-down proteomic analysis

- (Proceedings)Fagerquist, C.K., Zaragoza, W.J., Carter, M.Q. 2019. Typing/subtyping Shiga toxin from pathogenic Escherichia coli using MALDI-TOF-TOF tandem mass spectrometry and top-down proteomic analysis. Proceedings of the ASMS Conference on Mass Spectrometry and Allied Topics, June 2 - 6, 2019, Atlanta, GA. ID 297530 (ThP 536).Top-down and middle-down proteomic analysis of Shiga toxin using MALDI-TOF-TOF mass spectrometry
                                                        

- (Peer Reviewed Journal)Fagerquist, C.K., Zaragoza, W.J. 2019. Top-down and middle-down proteomic analysis of Shiga toxin using MALDI-TOF-TOF mass spectrometry. MethodsX. 6:815-826. https://doi.org/10.1016/j.mex.2019.04.011.Top-down (and middle-down) proteomics of bacterial proteins and toxins using MALDI-TOF-TOF-MS/MS

- (Proceedings)Fagerquist, C.K. 2019. Top-down (and middle-down) proteomics of bacterial proteins and toxins using MALDI-TOF-TOF-MS/MS. Meeting Proceedings. Mass Spectrometry: Application to the Clinical Lab 2019, March 31-April 4, 2019, Palm Springs, CA.Typing/subtyping Shiga toxin from pathogenic Escherichia coli using MALDI-TOF-TOF tandem mass spectrometry and top-down proteomic analysis

- (Abstract Only)Fagerquist, C.K., Zaragoza, W.J., Carter, M.Q. 2019. Typing/subtyping Shiga toxin from pathogenic Escherichia coli using MALDI-TOF-TOF tandem mass spectrometry and top-down proteomic analysis [abstract]. 67th ASMS Conference on Mass Spectrometry and Allied Topics, June 2-6, 2019, Atlanta, GA.The effect of asparagine and the aspartic acid fragmentation mechanism on post-source decay of intact Shiga toxin (Stx) from Shiga toxin-producing Escherichia coli (STEC) using MALDI-TOF-TOF mass spectrometry

- (Abstract Only)Fagerquist, C.K., Zaragoza, W.J. 2019. The effect of asparagine and the aspartic acid fragmentation mechanism on post-source decay of intact Shiga toxin (Stx) from Shiga toxin-producing Escherichia coli (STEC) using MALDI-TOF-TOF mass spectrometry [abstract]. Mass Spectrometry: Application to the Clinical Lab 2019, March 31-April 4, 2019, Palm Springs, CA.Software for top-down proteomic identification of a plasmid-borne factor (and other proteins) from genomically sequenced pathogenic bacteria using MALDI-TOF-TOF-MS/MS and post-source decay
                                                        

- (Peer Reviewed Journal)Fagerquist, C.K., Lee, B.G., Zaragoza, W.J., Yambao, J.C., Quiñones, B. 2018. Software for top-down proteomic identification of a plasmid-borne factor (and other proteins) from genomically sequenced pathogenic bacteria using MALDI-TOF-TOF-MS/MS and post-source decay. International Journal of Mass Spectrometry. 438:1-12. https://doi.org/10.1016/j.ijms.2018.12.006.Clinically-relevant Shiga toxin 2 subtypes from environmental Shiga toxin-producing Escherichia coli identified by top-down/middle-down proteomics and DNA sequencing
                                                        

- (Peer Reviewed Journal)Fagerquist, C.K., Zaragoza, W.J., Lee, B.G., Yambao, J.C., Quiñones, B. 2018. Clinically-relevant Shiga toxin 2 subtypes from environmental Shiga toxin-producing Escherichia coli identified by top-down/middle-down proteomics and DNA sequencing. Clinical Mass Spectrometry. 11:27-36. https://doi.org/10.1016/j.clinms.2018.12.001.Proteolytic surface-shaving and serotype-dependent expression of SPI-1 invasion proteins in Salmonella enterica subspecies enterica
                                                        

- (Peer Reviewed Journal)Fagerquist, C.K., Zaragoza, W.J. 2018. Proteolytic surface-shaving and serotype-dependent expression of SPI-1 invasion proteins in Salmonella enterica subspecies enterica. Frontiers in Nutrition. 5:124. https://doi.org/10.3389/fnut.2018.00124.Current (and future) applications of MALDI mass spectrometry in the identification and characterization of clinically-relevant microorganisms for research, clinical and regulatory laboratories

- (Proceedings)Fagerquist, C.K. 2019. Current (and future) applications of MALDI mass spectrometry in the identification and characterization of clinically-relevant microorganisms for research, clinical and regulatory laboratories. Meeting Proceedings. ASM Microbe 2019, June 20-24, 2019, San Francisco, CA.Top-down proteomic identification of a novel antibiotic-induced plasmid-encoded factor from Shiga toxin-producing Escherichia coli (STEC) using MALDI-TOF-TOF-MS/MS and post-source decay

- (Proceedings)Fagerquist, C.K., Lee, B.G., Zaragoza, W.J., Yambao, J.C., Quinones, B. 2018. Top-down proteomic identification of a novel antibiotic-induced plasmid-encoded factor from Shiga toxin-producing Escherichia coli (STEC) using MALDI-TOF-TOF-MS/MS and post-source decay. Proceedings for 66th Conference on Mass Spectrometry and Allied Topics, June 3-7, 2018, San Diego, California.Possible mistranslation of Shiga toxin from pathogenic Escherichia coli as measured by MALDI-TOF and Orbitrap mass spectrometry
                                                        

- (Peer Reviewed Journal)Fagerquist, C.K., Zaragoza, W.J. 2018. Possible mistranslation of Shiga toxin from pathogenic Escherichia coli as measured by MALDI-TOF and Orbitrap mass spectrometry. Journal of Analytical & Bioanalytical Techniques. 9(2):1000400. https://doi.org/10.4172/2155-9872.1000400.MALDI-TOF-TOF tandem mass spectrometry (MS/MS) for rapid top-down proteomic identification of bacterial proteins and toxins

- (Proceedings)Fagerquist, C.K. 2018. MALDI-TOF-TOF tandem mass spectrometry (MS/MS) for rapid top-down proteomic identification of bacterial proteins and toxins. Meeting Proceedings. In: Application to the Clinical Lab 2018. January 21-25, 2018, Palm Springs, CA.Translational errors in expression of Shiga toxin from pathogenic Escherichia coli as measured by MALDI-TOF-TOF and Orbitrap mass spectrometry

- (Proceedings)Fagerquist, C.K., Zaragoza, W.J. 2017. Translational errors in expression of Shiga toxin from pathogenic Escherichia coli as measured by MALDI-TOF-TOF and Orbitrap mass spectrometry. Meeting Proceedings. June 4-8, 2017.Complementary b/y fragment ion pairs from post-source decay of metastable YahO for calibration of MALDI-TOF-TOF-MS/MS

- (Peer Reviewed Journal)Fagerquist, C.K., Zaragoza, W.J. 2017. Complementary b/y fragment ion pairs from post-source decay of metastable YahO for calibration of MALDI-TOF-TOF-MS/MS. International Journal of Mass Spectrometry.  415:29-37.Unlocking the proteomic information encoded in MALDI-TOF-MS data used for microbial identification and characterization

- (Review Article)Fagerquist, C.K. 2017. Unlocking the proteomic information encoded in MALDI-TOF-MS data used for microbial identification and characterization. Expert Review of Proteomics. 14(1):97-107.Shiga toxin-producing escherichia coli: detection, differentiation, and implications for food safety

- (Monograph)Zaragoza, W.J., Teplitski, M., Fagerquist, C.K. 2016. Shiga toxin-producing escherichia coli: detection, differentiation, and implications for food safety. Extension Digital Information Source (EDIS). SL440, pages 1-6.YahO protein as a calibrant for top-down proteomic identification of Shiga toxin using MALDI-TOF-TOF-MS/MS and post-source decay

- (Proceedings)Fagerquist, C.K., Zaragoza, W.J. 2016. YahO protein as a calibrant for top-down proteomic identification of Shiga toxin using MALDI-TOF-TOF-MS/MS and post-source decay. Proceedings of the ASMS Conference on Mass Spectrometry and Allied Topics. 280941 MP 719.A designed experiments approach to optimizing MALDI-TOF MS spectrum processing parameters enhances detection of antibiotic resistance in Campylobacter jejuni

- (Peer Reviewed Journal)Christian, P., Grothendick, B., Zhang, L., Borror, C.M., Barbano, D., Cornelius, A.J., Gilpin, B.J., Fagerquist, C.K., Zaragoza, W.J., Lastovica, A.J., Cauchie, H., Sandrin, T.R. 2016. A designed experiments approach to optimizing MALDI-TOF MS spectrum processing parameters enhances detection of antibiotic resistance in Campylobacter jejuni. Frontiers in Microbiology. doi: 10.3389/fmicb.2016.00818.Bacteriophage cell lysis of Shiga toxin-producing Escherichia coli for top-down proteomic identification of Shiga toxin 1 & 2 using matrix-assisted laser desorption/ionization tandem time-of-light mass spectrometry

- (Peer Reviewed Journal)Fagerquist, C.K., Zaragoza, W.J. 2016. Bacteriophage cell lysis of Shiga toxin-producing Escherichia coli for top-down proteomic identification of Shiga toxin 1 & 2 using matrix-assisted laser desorption/ionization tandem time-of-light mass spectrometry. Rapid Communications in Mass Spectrometry. 30(6):671-680.Ratios of regioisomers of the molecular species of triacylglycerols in lesquerella (Physaria fendleri) oil estimated by mass spectrometry

- (Peer Reviewed Journal)Lin, J.T., Fagerquist, C.K., Chen, G.Q. 2016. Ratios of regioisomers of the molecular species of triacylglycerols in lesquerella (Physaria fendleri) oil estimated by mass spectrometry. Journal of the American Oil Chemists' Society. 93(2):183-191. doi: 10.1007/s11746-015-2769-2.Enhanced detection and identification of Shiga toxin 1 and 2 from pathogenic bacteria by MALDI-TOF-TOF-MS/MS-PSD and top-down proteomic analysis

- (Proceedings)Fagerquist, C.K., Zaragoza, W.J. 2015. Enhanced detection and identification of Shiga toxin 1 and 2 from pathogenic bacteria by MALDI-TOF-TOF-MS/MS-PSD and top-down proteomic analysis. ASMS201525491.3685VER.1.pdf.Shiga toxin 2 subtypes of enterohemorrhagic E. coli O157:H- E32511 analyzed by RT-qPCR and top-down proteomics using MALDI-TOF-TOF-MS

- (Peer Reviewed Journal)Fagerquist, C.K., Zaragoza, W.J. 2015. Shiga toxin 2 subtypes of enterohemorrhagic E. coli O157:H- E32511 analyzed by RT-qPCR and top-down proteomics using MALDI-TOF-TOF-MS. Journal of American Society for Mass Spectrometry. 5(26):788-799.Two Shiga toxin 2 subtypes in a single Shiga toxin-producing Escherichia coli analyzed by RT-qPCR, MALDI-TOF-TOF-MS and top-down proteomic analysis

- (Proceedings)Fagerquist, C.K., Zaragoza, W.J. 2014. Two Shiga toxin 2 subtypes in a single Shiga toxin-producing Escherichia coli analyzed by RT-qPCR, MALDI-TOF-TOF-MS and top-down proteomic analysis. Symposium Proceedings. Proceedings of the 62nd ASMS Conference on Mass Spectrometry and Applied Topics.ASMS201416869.Top-down proteomic identification of Shiga toxin 2 subtypes from Shiga toxin-producing Escherichia coli by Matrix-Assisted Laser Desorption Ionization-Tandem Time of Flight mass spectrometry

- (Peer Reviewed Journal)Fagerquist, C.K., Zaragoza, W.J., Sultan, O., Woo, N., Quinones, B., Cooley, M.B., Mandrell, R.E. 2014. Top-down proteomic identification of Shiga toxin 2 subtypes from Shiga toxin-producing Escherichia coli by Matrix-Assisted Laser Desorption Ionization-Tandem Time of Flight mass spectrometry. Applied and Environmental Microbiology. 8(9):2928-2940.Peptides identified in soybean protein increase plasma cholesterol in mice on hypercholesterolemic diets

- (Peer Reviewed Journal)Zhang, H., Bartley, G.E., Zhang, H., Wang, J., Fagerquist, C.K., Zhong, F., Yokoyama, W.H. 2013. Peptides identified in soybean protein increase plasma cholesterol in mice on hypercholesterolemic diets. Journal of Agricultural and Food Chemistry. 61(35):8389-8395.Top-down proteomic identification of Shiga toxin 2 variants from Shiga toxin-producing Escherichia coli (STEC) using MALDI-TOF-TOF-MS/MS-PSD

- (Proceedings)Fagerquist, C.K., Zaragoza, W.J., Sultan, O., Woo, N., Quinones, B., Swimley, M.S., Cooley, M.B., Mandrell, R.E. 2013. Top-down proteomic identification of Shiga toxin 2 variants from Shiga toxin-producing Escherichia coli (STEC) using MALDI-TOF-TOF-MS/MS-PSD. ASMS20139833.3125VER.1.pdf.The need for agriculture phenotyping: “Moving from genotype to phenotype”
                                                        

- (Peer Reviewed Journal)Boggess, M.V., Lippolis, J.D., Hurkman II, W.J., Fagerquist, C.K., Briggs, S.P., Gomes, A.V., Righetti, P., Bala, K. 2013. The need for agriculture phenotyping: “Moving from genotype to phenotype”. Journal of Proteomics. doi: http://dx.doi.org/10.1016/j.jptot.2013.3.021.Quantification and characterization of mucosa-associated and intracellular Escherichia coli in inflamatory bowel disease
                                                        

- (Peer Reviewed Journal)Elliott, T.R., Hudspith, B.N., Wu, G., Cooley, M.B., Parkes, G., Quinones, B., Randall, L., Mandrell, R.E., Fagerquist, C.K., Brostoff, J., Rayment, N.B., Boussioutas, A., Petrovska, L., Sanderson, J.D. 2013. Quantification and characterization of mucosa-associated and intracellular Escherichia coli in inflamatory bowel disease. Inflammatory Bowel Diseases. 19(11):2326-2338.Top-down proteomic identification of bacterial protein biomarkers and toxins using MALDI-TOF-TOF-MS/MS and post-source decay

- (Review Article)Fagerquist, C.K. 2013. Top-down proteomic identification of bacterial protein biomarkers and toxins using MALDI-TOF-TOF-MS/MS and post-source decay. Reviews in Analytical Chemistry. 32(2):127-133. doi:10.1515/revac-2012-0035.Possible evidence of amide bond formation between sinapinic acid and lysine-containing bacterial proteins by matrix-assisted laser desorption/ionization (MALDI) at 355 nm

- (Peer Reviewed Journal)Fagerquist, C.K., Sultan, O., Carter, M.Q. 2012. Possible evidence of amide bond formation between sinapinic acid and lysine-containing bacterial proteins by matrix-assisted laser desorption/ionization (MALDI) at 355 nm. Journal of American Society for Mass Spectrometry. 23(12):2102-2114.RcsB contributes to the distinct stress fitness between Escherichia coli O157:H7 curli variants of 1993 hamburger-associated outbreak strains

- (Peer Reviewed Journal)Carter, M.Q., Parker, C., Louie, J.W., Huynh, S., Fagerquist, C.K., Mandrell, R.E. 2012. RcsB contributes to the distinct stress fitness between Escherichia coli O157:H7 curli variants of 1993 hamburger-associated outbreak strains. Applied and Environmental Microbiology. doi:10.0028/AEM.02157-12.High sensitive and throughput screening of Aflatoxin using MALDI-TOF-TOF-PSD-MS/MS

- (Abstract Only)Hua, S.T., Woo, N., Sultan, O., Fagerquist, C.K. 2012. High sensitive and throughput screening of Aflatoxin using MALDI-TOF-TOF-PSD-MS/MS. Meeting Abstract. [abstract].A new calibrant for MALDI-TOF-TOF-PSD-MS/MS of non-digested proteins for top-down proteomic analysis

- (Peer Reviewed Journal)Fagerquist, C.K., Sultan, O. 2012. A new calibrant for MALDI-TOF-TOF-PSD-MS/MS of non-digested proteins for top-down proteomic analysis. Rapid Communications in Mass Spectrometry. 1241:1248.Evolutionary silence of the acid chaperone protein HdeB in enterohemorrhagic Escherichia coli O157:H7

- (Peer Reviewed Journal)Carter, M.Q., Louie, J.W., Fagerquist, C.K., Sultan, O., Miller, W.G., Mandrell, R.E. 2012. Evolutionary silence of the acid chaperone protein HdeB in enterohemorrhagic Escherichia coli O157:H7. Applied and Environmental Microbiology. 78:1004-1014.Top-down proteomic identification of protein biomarkers of food-borne pathogens using MALDI-TOF-TOF-MS/MS

- (Book / Chapter)Fagerquist, C.K., Sultan, O. 2012. Top-down proteomic identification of protein biomarkers of food-borne pathogens using MALDI-TOF-TOF-MS/MS. Lee, M.S. Editor. Mass Spectrometry Handbook.  New Jersey:John Wiley & Sons. p. 559-573.Molecular Insights into the Phenotypic Divergence in Natural Curli Variants of Escherichia coli O157:H7

- (Abstract Only)Induction and identification of disulfide-intact and disulfide-reduced beta-subunit of Shiga toxin 2 from Escherichia coli O157:H7 using MALDI-TOF-TOF-MS/MS and top-down proteomics

- (Peer Reviewed Journal)Fagerquist, C.K., Sultan, O. 2011. Induction and identification of disulfide-intact and disulfide-reduced beta-subunit of Shiga toxin 2 from Escherichia coli O157:H7 using MALDI-TOF-TOF-MS/MS and top-down proteomics. Analyst.136:1739-1746. DOI: 10.1039/C0AN00909A.Rapid Identification of Food-borne Pathogens by Top-Down Proteomics Using MALDI-TOF/TOF Mass Spectrometry

- (Book / Chapter)Fagerquist, C.K. 2011. Rapid Identification of Food-borne Pathogens by Top-Down Proteomics Using MALDI-TOF/TOF Mass Spectrometry. In: Fenselau, C; Demirev, P.,editors. Rapid Characterization of Microorganisms by Mass Spectrometry. Washington D.C., American Chemistry Society Publications. American Chemical Society Symposium Series. 1065:99-120Top-down proteomic identification of furin-cleaved alpha-subunit of Shiga toxin 2 from Escherichia coli O157:H7 using MALDI-TOF-TOF-MS/MS

- (Peer Reviewed Journal)Fagerquist, C.K., Sultan, O. 2010. Top-down proteomic identification of furin-cleaved alpha-subunit of Shiga toxin 2 from Escherichia coli O157:H7 using MALDI-TOF-TOF-MS/MS. Journal of Biomedicine and Biotechnology. DOI:10.1155/2010/123460.Rapid Identification of Protein Biomarkers of E. coli O157:H7 by MALDI-TOF-TOF Mass Spectrometry and Top-Down Proteomics

- (Peer Reviewed Journal)Fagerquist, C.K., Garbus, B.R., Miller, W.G., Williams, K.E., Yee, E., Bates, A.H., Boyle, S., Harden, L.A., Cooley, M.B., Mandrell, R.E. 2010. Rapid Identification of Protein Biomarkers of E. coli O157:H7 by MALDI-TOF-TOF Mass Spectrometry and Top-Down Proteomics. Analytical Chemistry. 82:2717-2725.Covalent attachment and dissociative loss of sinapinic acid to/from cysteine-containing proteins from bacterial cell lysates analyzed by MALDI-TOF-TOF mass spectrometry

- (Peer Reviewed Journal)Fagerquist, C.K., Garbus, B., Williams, K., Bates, A.H., Harden, L.A. 2010. Covalent attachment and dissociative loss of sinapinic acid to/from cysteine-containing proteins from bacterial cell lysates analyzed by MALDI-TOF-TOF mass spectrometry. Journal of American Society for Mass Spectrometry. 21,819-832.Rapid Identification of E. coli O157:H7 by "Top-Down" Proteomics Using MALDI-TOF/TOF Mass Spectrometry

- (Proceedings)Fagerquist, C.K., Garbus, B.R., Williams, K.E., Bates, A.H., Boyle, S., Harden, L.A., Miller, W.G., Mandrell, R.E. 2009. Rapid Identification of E. coli O157:H7 by "Top-Down" Proteomics Using MALDI-TOF/TOF Mass Spectrometry.IN: Proceedings of the 57th American Society of Mass Spectrometry Conference, May 31-June 4, 2009, Philadelphia, PA. DVD:A091307.8125ver.1.pdfWeb-based software for rapid "top-down" proteomic identification of protein biomarkers with implications for bacterial identification

- (Peer Reviewed Journal)Fagerquist, C.K., Garbus, B.R., Williams, K., Bates, A.H., Boyle, S., Harden, L.A. 2009. Web-based software for rapid "top-down" proteomic identification of protein biomarkers with implications for bacterial identification. Applied and Environmental Microbiology. 75(13):4341-4353.Rapid Identification of E. coli O157:H7 by "Top-Down" Proteomics Using MALDI-TOF/TOF Mass Spectrometry

- (Abstract Only)Proteomics of foodborne bacterial pathogens

- (Book / Chapter)Fagerquist, C.K. 2011. Proteomics of foodborne bacterial pathogens. In: Wiedman, M.; Zhang, W., editors of: Genomics of foodborne bacterial pathogens. New York, NY: Springer. p. 343-402.High Resolution Genotyping of Campylobacter Using PCR and High-Throughput Mass Spectrometry

- (Peer Reviewed Journal)Hannis, J., Manalili, S., Hall, T., Ranken, R., White, N., Sampath, R., Blyn, L., Ecker, D., Mandrell, R.E., Fagerquist, C.K., Bates, A.H., Miller, W.G., Hofstadler, S. 2008. High Resolution Genotyping of Campylobacter Using PCR and High-Throughput Mass Spectrometry. Journal of Clinical Microbiology.46(4) 1220-1225.Composite sequence proteomic analysis of protein biomarkers of Campylobacter coli, C. lari and C. concisus for bacterial identification

- (Peer Reviewed Journal)Fagerquist, C.K., Yee, E., Miller, W.G. 2007. Composite sequence proteomic analysis of protein biomarkers of Campylobacter coli, C. lari and C. consisus for bacterial identification. The Analyst. 132(10):1010-1023.Amino Acid Sequence Determination of Protein Biomarkers of Campylobacter upsaliensis and C. helveticus by 'Composite' Sequence Proteomic Analysis

- (Peer Reviewed Journal)Fagerquist, C.K. 2007. Amino Acid Sequence Determination of Protein Biomarkers of Campylobacter upsaliensis and C. helveticus by "Composite" Sequence Proteomic Analysis. Journal of Proteome Research. 6(7):2539-2549.Identification of Foodborne Bacteria by High Energy Collision-Induced Dissociation of Their Protein Biomarkers by MALDI Tandem-Time-of-Flight Mass Spectrometry

- (Proceedings)Fagerquist, C.K., Williams, K.E., Bates, A. H. Identification of Foodborne Bacteria by High Energy Collision-Induced Dissociation of their Protein Biomarkers by MALDI Tandem-Time-of-Flight Mass Spectrometry.  In:  Proceedings of the 55th American Society of Mass Spectrometry Conference, June 3-7, 2007, Indianapolis, IN.  [DVD MPT-327 from ASMS.]IDENTIFICATION OF THE MOLECULAR SPECIES OF TRIACYLGLYCEROLS BY HPLC AND AN ACYLACYL-DIACYLGLYCEROL (TETRAACYLGLYCEROL) BY USING RESOLUTION ELECTROSPRAY IONIZATION TADEM MASS SPECTROMETRY IN CASTOR OIL

- (Proceedings)Lin, J.T., Arcinas, A.J., Fagerquist, C.K. 2006. Identification of the molecular species of triacylglycerols by hplc and an acylacyl-diacylglycerol (tetraacylglycerol) by using resolution electrospray ionization tadem mass spectrometry in castor oil. International Symposium on Biocatalysis and Biotechnology:  Functional Food and Industrial Products.SUB-SPECIATING CAMPYLOBACTER JEJUNI BY PROTEOMIC ANALYSIS OF ITS PROTEIN BIOMARKERS AND THEIR POST-TRANSLATIONAL MODIFICATIONS

- (Peer Reviewed Journal)Fagerquist, C.K., Bates, A.H., Heath, S., King, B.C., Garbus, B.R., Harden, L.A., Miller, W.G. Sub-speciating campylobacter jejuni by proteomic analysis of its protein biomarkers and their post-translational modifications. Journal of Proteome Research. 5:10:2527-2538IDENTIFICATION OF (12-RICINOLEOYL-RICINOLEOYL)-DIRICINOLEOYL-GYLCEROL, AN ACYLGLYCEROL CONTAINING FOUR ACYL CHAINS, IN CASTOR BY LC-ESI-MS

- (Peer Reviewed Journal)Lin, J.T., Arcinas, A.J., Harden, L.A., Fagerquist, C.K. 2006. Identification of (12-ricinoleoyl-ricinoleoyl)-diricinoleoyl-gylcerol, an acylglycerol containing four acyl chains, in castor by lc-esi-ms. Journal of Agriculture and Food Chemistry. 54(10):3498-3504.IDENTIFICATION OF (12-RICINOLEOYL-RICINOLEOYL)-DIRICINOLEOYL-GLYCEROL IN CASTOR OIL BY ESI-MS/MS AND ITS BIOSYNTHESIS

- (Abstract Only)Lin, J.T., Arcinas, A.J., Harden, L.A., Fagerquist, C.K. 2006. Identification of (12-ricinoleoyl-ricinoleoyl)-diricinoleoyl-glycerol in castor oil by esi-ms/ms and its biosynthesis. American Oil Chemists' Society Meeting.IMPLICATION OF C-TERMINAL DELETION ON THE STRUCTURE AND STABILITY OF BOVINE B-CASEIN

- (Peer Reviewed Journal)Qi, P.X., Wickham, E.D., Piotrowski, E.G., Fagerquist, C.K., Farrell Jr, H.M. 2005. Implication of c-terminal deletion on the structure and stability of bovine b-casein. Protein Journal. 24(7-8):431-444.SPECIATION OF CAMPYLOBACTER COLI, C. JEJUNI, C. HELVETICUS, C. LARI, C. SPUTORUM, AND C. UPSALIENSIS BY MATRIX-ASSISTED LASER DESORPTION IONIZATION-TIME OF FLIGHT (MALDI-TOF) MASS SPECTROMETRY

- (Peer Reviewed Journal)Mandrell, R.E., Harden, L.A., Bates, A.H., Miller, W.G., Haddon, W.F., Fagerquist, C.K. 2005. Speciation of campylobacter coli, c. jejuni, c. helveticus, c. lari, c. sputorum, and c. upsaliensis by matrix-assisted laser desorption ionization-time of flight (maldi-tof) mass spectrometry. Applied and Environmental Microbiology. 71:10 p. 6292-6307GENOMIC AND PROTEOMIC IDENTIFICATION OF A DNA-BINDING PROTEIN USED IN THE "FINGERPRINTING" OF CAMPYLOBACTER SPECIES AND STRAINS BY MALDI-TOF-MS PROTEIN BIOMARKER ANALYSIS

- (Peer Reviewed Journal)Fagerquist, C.K., Miller, W.G., Harden, L.A., Bates, A.H., Vensel, W.H., Wang, G., Mandrell, R.E. 2005. Genomic and proteomic identification of a dna-binding protein used in the "fingerprinting" of campylobacter species and strains by maldi-tof-ms protein biomarker analysis. Analytical Chemistry. web release 6/25/05, 77:4897-4907CONFIRMATORY AND QUANTITATIVE ANALYSIS OF B-LACTAM ANTIBIOTICS IN BOVINE KIDNEY TISSUE BY DISPERSIVE SOLID-PHASE EXTRACTION AND LIQUID CHROMATOGRAPHY-TANDEM MASS SPECTROMETRY

- (Peer Reviewed Journal)Fagerquist, C.K., Lightfield, A.R., Lehotay, S.J. 2005. Confirmatory and quantitative analysis of b-lactam antibiotics in bovine kidney tissue by dispersive solid-phase extraction and liquid chromatography-tandem mass spectrometry. Analytical Chemistry 5(77).1473-1482.FINGERPRINTING OF CAMPYLOBACTER SPECIES AND STRAINS BY MASS SPECTROMETRIC IDENTIFICATION OF PROTEIN BIOMARKERS

- (Proceedings)Fagerquist, C.K., Harden, L.A., Miller, W.G., Fouts, D., Nelson, K., Mandrell, R.E. 2004. Fingerprinting of campylobacter species and strains by mass spectrometric identification of protein biomarkers. In: Proceedings of the 52nd American Society for Mass Spectrometry Conference and Allied Topics. May 23-27, 2004 Nashville, TN. CDROMCOLLISION-ACTIVATED CLEAVAGE OF A PEPTIDE/ANTIBIOTIC DISULFIDE LINKAGE: EVIDENCE OF INTRAMOLECULAR DISULFIDE BOND REARRANGEMENT UPON COLLISIONAL ACTIVATION

- (Peer Reviewed Journal)FAGERQUIST, C.K. COLLISION-ACTIVATED CLEAVAGE OF A PEPTIDE/ANTIBIOTIC DISULFIDE LINKAGE: EVIDENCE OF INTRAMOLECULAR DISULFIDE BOND REARRANGEMENT UPON COLLISIONAL ACTIVATION. RAPID COMMUNICATIONS IN MASS SPECTROMETRY.COLLISON-ACTIVATED CLEAVAGE OF A PEPTIDE/ANTIOBIOTIC LINKAGE: EVIDENCE FOR GAS-PHASE INTRAMOLECULAR DISULFIDE EXCHANGE

- (Abstract Only)FAGERQUIST, C.K. COLLISON-ACTIVATED CLEAVAGE OF A PEPTIDE/ANTIOBIOTIC LINKAGE: EVIDENCE FOR GAS-PHASE INTRAMOLECULAR DISULFIDE EXCHANGE. AMERICAN SOCIETY FOR MASS SPECTROMETRY. 2002.ANALYSIS FOR B-LACTAM ANTIBIOTICS IN KIDNEY TISSUE BY LIQUID CHROMATOGRAPHY WITH ELECTROSPRAY IONIZATION AND SELECTIVE REACTION MONITORING/TANDEM ION TRAP MASS SPECTROMETRY

- (Peer Reviewed Journal)FAGERQUIST, C.K., LIGHTFIELD, A.R. ANALYSIS FOR B-LACTAM ANTIBIOTICS IN KIDNEY TISSUE BY LIQUID CHROMATOGRAPHY WITH ELECTROSPRAY IONIZATION AND SELECTIVE REACTION MONITORING/TANDEM ION TRAP MASS SPECTROMETRY. RAPID COMMUNICATIONS IN MASS SPECTROMETRY. 2003.A BIOACTIVE ANTIOBIOTIC LINKED TO PEPTIDES IS RELEASED BY ELECTRON CAPTURE DISSOCIATION FOURIER TRANSFORM ION CYCLOTRON RESONANCE MASS SPECTROMETRY

- (Peer Reviewed Journal)FAGERQUIST, C.K., HUDGINS, R.R., EMMETT, M.R., HAKANSSON, K., MARSHALL, A.G. A BIOACTIVE ANTIOBIOTIC LINKED TO PEPTIDES IS RELEASED BY ELECTRON CAPTURE DISSOCIATION FOURIER TRANSFORM ION CYCLOTRON RESONANCE MASS SPECTROMETRY. JOURNAL OF AMERICAN SOCIETY FOR MASS SPECTROMETRY.  2003.SELECTIVE CLEAVAGE OF A SMALL ANTIBIOTIC DRUG MOLECULE FROM A PEPTIDE AND PROTEIN IN THE GAS PHASE USING ELECTRON CAPTURE DISSOCIATION AND FOURIER TRANSFORM ION CYCLOTRON RESONANCE MASS SPECTROMETRY

- (Abstract Only)FAGERQUIST, C.K., HUDGINS, R.R., EMMETT, M.R., HAKANSSON, K., MARSHALL, A.G. SELECTIVE CLEAVAGE OF A SMALL ANTIBIOTIC DRUG MOLECULE FROM A PEPTIDE AND  PROTEIN IN THE GAS PHASE USING ELECTRON CAPTURE DISSOCIATION AND FOURIER   TRANSFORM ION CYCLOTRON RESONANCE MASS SPECTROMETRY. MEETING ABSTRACT. 2002.APPROACHES AND RECOMMENDATIONS TO VALIDATE MS CONFIRMATION CRITERIA FOR VETERINARY DRUG RESIDUES IN FOOD

- (Abstract Only)LEHOTAY, S.J., SCHNEIDER, M.J., FAGERQUIST, C.K., LIGHTFIELD, A.R. APPROACHES AND RECOMMENDATIONS TO VALIDATE MS CONFIRMATION CRITERIA FOR VETERINARY DRUG RESIDUES IN FOOD. 116TH AOAC INTERNATIONAL ANNUAL MEETING. ABSTRACT. 2002. P. 80.


Return to top


Connect with ARS Sign up


ARS Home
                            USDA.gov
                            Plain Writing
                            Policies & Links
                            Civil Rights Statements
                            FOIA
                            Accessibility Statement
                            Privacy Policy
                            Non-Discrimination Statement
                            Quality of Information
                            USA.gov
                            WhiteHouse.gov