Evaluation of large scale quantitative proteomic assay development using peptide affinity-based mass spectrometry.
Stable isotope standards and capture by antipeptide antibodies (SISCAPA) couples affinity enrichment of peptides with stable isotope dilution and detection by multiple reaction monitoring mass spectrometry to provide quantitative measurement of peptides as surrogates for their respective proteins. In this report, we describe a feasibility study to determine the success rate for production of suitable antibodies for SISCAPA assays in order to inform strategies for large-scale assay development. A workflow was designed that included a multiplex immunization strategy in which up to five proteotypic peptides from a single protein target were used to immunize individual rabbits. A total of 403 proteotypic tryptic peptides representing 89 protein targets were used as immunogens. Antipeptide antibody titers were measured by ELISA and 220 antipeptide antibodies representing 89 proteins were chosen for affinity purification. These antibodies were characterized with respect to their performance in SISCAPA-multiple reaction monitoring assays using trypsin-digested human plasma matrix. More than half of the assays generated were capable of detecting the target peptide at concentrations of less than 0.5 fmol/μl in human plasma, corresponding to protein concentrations of less than 100 ng/ml. The strategy of multiplexing five peptide immunogens was successful in generating a working assay for 100% of the targeted proteins in this evaluation study. These results indicate it is feasible for a single laboratory to develop hundreds of assays per year and allow planning for cost-effective generation of SISCAPA assays.
Fred Hutchinson Cancer Research Center, 1100 Fairview Ave. N., Seattle, WA 98109, USA.
Jeffrey R
JR
Whiteaker
Lei
L
Zhao
Susan E
SE
Abbatiello
Michael
M
Burgess
Eric
E
Kuhn
ChenWei
C
Lin
Matthew E
ME
Pope
Morteza
M
Razavi
N Leigh
NL
Anderson
Terry W
TW
Pearson
Steven A
SA
Carr
Amanda G
AG
Paulovich
D000595:Amino Acid Sequence; D000818:Animals; D001798:Blood Proteins / Q000276:immunology* / Q000378:metabolism; D002352:Carrier Proteins / Q000097:blood / Q000276:immunology; D006801:Humans; D007106:Immune Sera; D007118:Immunoassay / Q000379:methods; D013058:Mass Spectrometry / Q000379:methods; D008840:Microfilament Proteins / Q000097:blood / Q000276:immunology; D025202:Molecular Diagnostic Techniques; D010455:Peptides / Q000276:immunology; D020543:Proteome / Q000378:metabolism*; D011817:Rabbits; D012680:Sensitivity and Specificity
D001798:Blood Proteins; D002352:Carrier Proteins; C502658:FSCN1 protein, human; D007106:Immune Sera; D008840:Microfilament Proteins; D010455:Peptides; D020543:Proteome
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