TY - JOUR
T1 - Novel Reversible Biotinylated Probe for the Selective Enrichment of Phosphorylated Peptides from Complex Mixtures
AU - Jalili, Pegah R.
AU - Ball, Haydn L.
N1 - Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2008/5
Y1 - 2008/5
N2 - To improve the detection of phosphorylated peptides/proteins, we developed a novel protocol that involves the chemical derivatization of phosphate groups with a chemically engineered biotinylated-tag (biotin-tag), possessing three functional domains; a biotin group for binding to avidin, a base-labile 4-carboxy fluorenyl methoxycarbonyl (4-carboxy Fmoc) group, and a nucleophilic sulfhydryl moiety on the side-chain of cysteine. Using this approach, the derivatized, enzymatically digested peptides were selectively separated from unrelated sequences and impurities on immobilized avidin. Unlike previously published phosphopeptide enrichment procedures, this approach upon treatment with mild base liberates a covalently bound Gly-Cys analog of the peptide(s) of interest, exhibiting improved RP-HPLC retention and MS ionization properties compared with the precursor phosphopeptide sequence. The results obtained for a model peptide Akt-1 and two protein digests, demonstrated that the method is highly specific and allows selective enrichment of phosphorylated peptides at low concentrations of fmol/μL.
AB - To improve the detection of phosphorylated peptides/proteins, we developed a novel protocol that involves the chemical derivatization of phosphate groups with a chemically engineered biotinylated-tag (biotin-tag), possessing three functional domains; a biotin group for binding to avidin, a base-labile 4-carboxy fluorenyl methoxycarbonyl (4-carboxy Fmoc) group, and a nucleophilic sulfhydryl moiety on the side-chain of cysteine. Using this approach, the derivatized, enzymatically digested peptides were selectively separated from unrelated sequences and impurities on immobilized avidin. Unlike previously published phosphopeptide enrichment procedures, this approach upon treatment with mild base liberates a covalently bound Gly-Cys analog of the peptide(s) of interest, exhibiting improved RP-HPLC retention and MS ionization properties compared with the precursor phosphopeptide sequence. The results obtained for a model peptide Akt-1 and two protein digests, demonstrated that the method is highly specific and allows selective enrichment of phosphorylated peptides at low concentrations of fmol/μL.
UR - http://www.scopus.com/inward/record.url?scp=42749086358&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=42749086358&partnerID=8YFLogxK
U2 - 10.1016/j.jasms.2008.02.004
DO - 10.1016/j.jasms.2008.02.004
M3 - Article
C2 - 18359247
AN - SCOPUS:42749086358
SN - 1044-0305
VL - 19
SP - 741
EP - 750
JO - Journal of the American Society for Mass Spectrometry
JF - Journal of the American Society for Mass Spectrometry
IS - 5
ER -