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Effect of the addition of diammonium citrate to alpha-cyano-4-hydroxycinnamic acid (CHCA) matrix for the detection of phosphorylated peptide in phosphorylation reactions using cell and tissue lysates.

作者信息

Kang Jeong-Hun, Toita Riki, Oishi Jun, Niidome Takuro, Katayama Yoshiki

机构信息

CREST, Japan Science and Technology Corporation, Kawaguchi, Japan.

出版信息

J Am Soc Mass Spectrom. 2007 Nov;18(11):1925-31. doi: 10.1016/j.jasms.2007.08.002. Epub 2007 Aug 15.

DOI:10.1016/j.jasms.2007.08.002
PMID:17869536
Abstract

The ionization of phosphorylated peptides is usually suppressed by non-phosphorylated peptides when alpha-cyano-4-hydroxycinnamic acid (CHCA) is used as a matrix for matrix-assisted laser desorption/ionization-time-of-Flight (MALDI-TOF) mass spectrometry analysis. In the present study, we examined the effect of diammonium citrate addition to the CHCA matrix on the detection of phosphorylated peptides. Substrates for protein kinase C (PKC) and c-Src were synthesized and phosphorylated by reaction with cell and tissue lysate samples. The addition of diammonium citrate to the CHCA matrix increased the sensitivity for distinguishing phosphorylated peptides from background noise. However, the effect depended on substrate concentration.

摘要

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