Clifton K Fagerquist

Summary

Affiliation: Agricultural Research Service
Country: USA

Publications

  1. doi request reprint Possible evidence of amide bond formation between sinapinic acid and lysine-containing bacterial proteins by matrix-assisted laser desorption/ionization (MALDI) at 355 nm
    Clifton K Fagerquist
    Agricultural Research Service, US Department of Agriculture, Western Regional Research Center, 800 Buchanan Street, Albany, CA 94710, USA
    J Am Soc Mass Spectrom 23:2102-14. 2012
  2. doi request reprint A new calibrant for matrix-assisted laser desorption/ionization time-of-flight-time-of-flight post-source decay tandem mass spectrometry of non-digested proteins for top-down proteomic analysis
    Clifton K Fagerquist
    Western Regional Research Center, Agricultural Research Service, US Department of Agriculture, Albany, CA 94710, USA
    Rapid Commun Mass Spectrom 26:1241-8. 2012
  3. pmc Top-down proteomic identification of furin-cleaved α-subunit of Shiga toxin 2 from Escherichia coli O157:H7 using MALDI-TOF-TOF-MS/MS
    Clifton K Fagerquist
    Western Regional Research Center, Agricultural Research Service, U S Department of Agriculture, 800 Buchanan Street, Albany, CA 94710, USA
    J Biomed Biotechnol 2010:123460. 2010
  4. doi request reprint Rapid identification of protein biomarkers of Escherichia coli O157:H7 by matrix-assisted laser desorption ionization-time-of-flight-time-of-flight mass spectrometry and top-down proteomics
    Clifton K Fagerquist
    Western Regional Research Center, Agricultural Research Service, U S Department of Agriculture, 800 Buchanan Street, Albany, California 94710, USA
    Anal Chem 82:2717-25. 2010
  5. doi request reprint Covalent attachment and dissociative loss of sinapinic acid to/from cysteine-containing proteins from bacterial cell lysates analyzed by MALDI-TOF-TOF mass spectrometry
    Clifton K Fagerquist
    Western Regional Research Center, Agricultural Research Service, United States Department of Agriculture, Albany, California 94710, USA
    J Am Soc Mass Spectrom 21:819-32. 2010
  6. pmc Web-based software for rapid top-down proteomic identification of protein biomarkers, with implications for bacterial identification
    Clifton K Fagerquist
    Western Regional Research Center, U S Department of Agriculture, Albany, CA 94710, USA
    Appl Environ Microbiol 75:4341-53. 2009
  7. doi request reprint Induction and identification of disulfide-intact and disulfide-reduced β-subunit of Shiga toxin 2 from Escherichia coli O157:H7 using MALDI-TOF-TOF-MS/MS and top-down proteomics
    Clifton K Fagerquist
    Western Regional Research Center, Agricultural Research Service, U S Department of Agriculture, 800 Buchanan Street, Albany, CA 94710, USA
    Analyst 136:1739-46. 2011
  8. ncbi request reprint Sub-speciating Campylobacter jejuni by proteomic analysis of its protein biomarkers and their post-translational modifications
    Clifton K Fagerquist
    Western Regional Research Center, Agricultural Research Service, United States Department of Agriculture, 800 Buchanan Street, Albany, California 94710, USA
    J Proteome Res 5:2527-38. 2006
  9. pmc RcsB contributes to the distinct stress fitness among Escherichia coli O157:H7 curli variants of the 1993 hamburger-associated outbreak strains
    Michelle Q Carter
    Produce Safety and Microbiology Unit, Western Regional Research Center, Agricultural Research Service, USDA, Albany, California, USA
    Appl Environ Microbiol 78:7706-19. 2012
  10. ncbi request reprint Confirmatory and quantitative analysis of beta-lactam antibiotics in bovine kidney tissue by dispersive solid-phase extraction and liquid chromatography-tandem mass spectrometry
    Clifton K Fagerquist
    Western Regional Research Center, Agricultural Research Service, U S Department of Agriculture, Albany, California 94710, USA
    Anal Chem 77:1473-82. 2005

Detail Information

Publications20

  1. doi request reprint Possible evidence of amide bond formation between sinapinic acid and lysine-containing bacterial proteins by matrix-assisted laser desorption/ionization (MALDI) at 355 nm
    Clifton K Fagerquist
    Agricultural Research Service, US Department of Agriculture, Western Regional Research Center, 800 Buchanan Street, Albany, CA 94710, USA
    J Am Soc Mass Spectrom 23:2102-14. 2012
    ....
  2. doi request reprint A new calibrant for matrix-assisted laser desorption/ionization time-of-flight-time-of-flight post-source decay tandem mass spectrometry of non-digested proteins for top-down proteomic analysis
    Clifton K Fagerquist
    Western Regional Research Center, Agricultural Research Service, US Department of Agriculture, Albany, CA 94710, USA
    Rapid Commun Mass Spectrom 26:1241-8. 2012
    ..However, there is no commonly accepted calibrant for this purpose beyond the use of peptide calibrants whose fragment ions span a lower mass-to-charge (m/z) range...
  3. pmc Top-down proteomic identification of furin-cleaved α-subunit of Shiga toxin 2 from Escherichia coli O157:H7 using MALDI-TOF-TOF-MS/MS
    Clifton K Fagerquist
    Western Regional Research Center, Agricultural Research Service, U S Department of Agriculture, 800 Buchanan Street, Albany, CA 94710, USA
    J Biomed Biotechnol 2010:123460. 2010
    ..The peak at m/z 5286 was definitively identified by MALDI-TOF-TOF-MS/MS and top-down proteomics as the A2 fragment of α-Stx2...
  4. doi request reprint Rapid identification of protein biomarkers of Escherichia coli O157:H7 by matrix-assisted laser desorption ionization-time-of-flight-time-of-flight mass spectrometry and top-down proteomics
    Clifton K Fagerquist
    Western Regional Research Center, Agricultural Research Service, U S Department of Agriculture, 800 Buchanan Street, Albany, California 94710, USA
    Anal Chem 82:2717-25. 2010
    ..coli O157:H7 strains was identified by top-down analysis to be the HdeB acid stress chaperone-like protein consistent with previous identifications by gene sequencing and bottom-up proteomics...
  5. doi request reprint Covalent attachment and dissociative loss of sinapinic acid to/from cysteine-containing proteins from bacterial cell lysates analyzed by MALDI-TOF-TOF mass spectrometry
    Clifton K Fagerquist
    Western Regional Research Center, Agricultural Research Service, United States Department of Agriculture, Albany, California 94710, USA
    J Am Soc Mass Spectrom 21:819-32. 2010
    ....
  6. pmc Web-based software for rapid top-down proteomic identification of protein biomarkers, with implications for bacterial identification
    Clifton K Fagerquist
    Western Regional Research Center, U S Department of Agriculture, Albany, CA 94710, USA
    Appl Environ Microbiol 75:4341-53. 2009
    ....
  7. doi request reprint Induction and identification of disulfide-intact and disulfide-reduced β-subunit of Shiga toxin 2 from Escherichia coli O157:H7 using MALDI-TOF-TOF-MS/MS and top-down proteomics
    Clifton K Fagerquist
    Western Regional Research Center, Agricultural Research Service, U S Department of Agriculture, 800 Buchanan Street, Albany, CA 94710, USA
    Analyst 136:1739-46. 2011
    ..Easier to interpret MS/MS data were obtained for the disulfide-reduced β-Stx2 which resulted in an improved top-down identification...
  8. ncbi request reprint Sub-speciating Campylobacter jejuni by proteomic analysis of its protein biomarkers and their post-translational modifications
    Clifton K Fagerquist
    Western Regional Research Center, Agricultural Research Service, United States Department of Agriculture, 800 Buchanan Street, Albany, California 94710, USA
    J Proteome Res 5:2527-38. 2006
    ....
  9. pmc RcsB contributes to the distinct stress fitness among Escherichia coli O157:H7 curli variants of the 1993 hamburger-associated outbreak strains
    Michelle Q Carter
    Produce Safety and Microbiology Unit, Western Regional Research Center, Agricultural Research Service, USDA, Albany, California, USA
    Appl Environ Microbiol 78:7706-19. 2012
    ....
  10. ncbi request reprint Confirmatory and quantitative analysis of beta-lactam antibiotics in bovine kidney tissue by dispersive solid-phase extraction and liquid chromatography-tandem mass spectrometry
    Clifton K Fagerquist
    Western Regional Research Center, Agricultural Research Service, U S Department of Agriculture, Albany, California 94710, USA
    Anal Chem 77:1473-82. 2005
    ....
  11. pmc Evolutionary silence of the acid chaperone protein HdeB in enterohemorrhagic Escherichia coli O157:H7
    Michelle Q Carter
    Produce Safety and Microbiology Research Unit, Western Regional Research Center, Agricultural Research Service, US Department of Agriculture, Albany, California, USA
    Appl Environ Microbiol 78:1004-14. 2012
    ..These results suggest a divergent evolution of acid resistance mechanisms within E. coli...
  12. ncbi request reprint 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
    Clifton K Fagerquist
    Western Regional Research Service, Agricultural Research Service, U S Department of Agriculture, Albany, California 94710, USA
    Anal Chem 77:4897-907. 2005
    ..upsaliensis strains. We have also tentatively assigned a approximately 10.5-kDa protein biomarker of a C. concisus strain as an HU protein...
  13. ncbi request reprint Composite sequence proteomic analysis of protein biomarkers of Campylobacter coli, C. lari and C. concisus for bacterial identification
    Clifton K Fagerquist
    Western Regional Research Center, Agricultural Research Service, US Department of Agriculture, 800 Buchanan Street, Albany, California 94710, USA
    Analyst 132:1010-23. 2007
    ..The sequence obtained could then be used as a strain-specific biomarker for analysis by 'top-down' proteomics techniques...
  14. ncbi request reprint Amino acid sequence determination of protein biomarkers of Campylobacter upsaliensis and C. helveticus by "composite" sequence proteomic analysis
    Clifton K Fagerquist
    Western Regional Research Center, Agricultural Research Service, United States Department of Agriculture, 800 Buchanan Street, Albany, California 94710, USA
    J Proteome Res 6:2539-49. 2007
    ....
  15. pmc Speciation of Campylobacter coli, C. jejuni, C. helveticus, C. lari, C. sputorum, and C. upsaliensis by matrix-assisted laser desorption ionization-time of flight mass spectrometry
    Robert E Mandrell
    USDA, ARS, WRRC, 800 Buchanan St, Albany, CA 94710, USA
    Appl Environ Microbiol 71:6292-307. 2005
    ..MALDI-TOF MS provides an accurate, sensitive, and rapid method for identification of multiple Campylobacter species relevant to public health and food safety...
  16. ncbi request reprint Collision-activated cleavage of a peptide/antibiotic disulfide linkage: possible evidence for intramolecular disulfide bond rearrangement upon collisional activation
    Clifton K Fagerquist
    Eastern Regional Research Center, Agricultural Research Service, U S Department of Agriculture, Wyndmoor, PA, USA
    Rapid Commun Mass Spectrom 18:685-700. 2004
    ..These results demonstrate the facile dissociative loss by CAD of DFC moieties covalently attached to peptides through disulfide bonds. Published in 2004 by John Wiley & Sons, Ltd...
  17. ncbi request reprint Identification of (12-ricinoleoylricinoleoyl)diricinoleoylglycerol, an acylglycerol containing four acyl chains, in castor (Ricinus communis L.) oil by LC-ESI-MS
    Jiann Tsyh Lin
    Western Regional Research Center, Agricultural Research Service, U S Department of Agriculture, 800 Buchanan Street, Albany, California 94710, USA
    J Agric Food Chem 54:3498-504. 2006
    ..This newly identified and biosynthesized RRRR represents a new AG subclass of tetra-acylglycerols (or acylacyldiacylglycerol)...
  18. ncbi request reprint An antibiotic linked to peptides and proteins is released by electron capture dissociation fourier transform ion cyclotron resonance mass spectrometry
    Clifton K Fagerquist
    United States Department of Agriculture, Agricultural Research Service, Eastern Regional Research Center, Wyndmoor, Pennsylvania 19038, USA
    J Am Soc Mass Spectrom 14:302-10. 2003
    ..ECD of [insulin + DFC + 4H](4+) shows preferential dissociative loss of DFC. Combined with HPLC, ECD FT-ICR-MS may be an efficient screening method for detection of drug-biomolecule binding...
  19. ncbi request reprint Confirmatory analysis of beta-lactam antibiotics in kidney tissue by liquid chromatography/electrospray ionization selective reaction monitoring ion trap tandem mass spectrometry
    Clifton K Fagerquist
    Eastern Regional Research Center, Agricultural Research Service, US Department of Agriculture, 600 East Mermaid Lane, Wyndmoor, PA 19038, USA
    Rapid Commun Mass Spectrom 17:660-71. 2003
    ..We also found that SRM MS(n) was superior in the analysis of unknown incurred tissue than full spectrum MS(n). We also obtained an MS/MS spectrum of DCCD that is significantly at variance with previously published fragmentation spectra...
  20. ncbi request reprint Implication of C-terminal deletion on the structure and stability of bovine beta-casein
    Phoebe X Qi
    U S Department of Agriculture, Eastern Regional Research Center, Agricultural Research Service, 600 East Mermaid Lane, Wyndmoor, PA, 19038, USA
    Protein J 24:431-44. 2005
    ..It has been demonstrated clearly that the tail peptide beta-CN-(f193-209) is important in maintaining the hydrophobic core of beta-CN but the residual association observed argues for a minor role for other sites as well...