A site-specific, multiplexed kinase activity assay using stable-isotope dilution and high-resolution mass spectrometry

Yonghao Yu, Rana Anjum, Kazuishi Kubota, John Rush, Judit Villen, Steven P. Gygi

Research output: Contribution to journalArticlepeer-review

61 Scopus citations

Abstract

Most kinases are capable of recognizing and phosphorylating peptides containing short, linear sequence motifs. To measure the activation state of many kinases from the same cell lysate, we created a multiplexed, mass-spectrometry-based in vitro kinase assay. Ninety chemically synthesized peptides derived from well-characterized peptide substrates and in vivo phosphorylation sites with either known or previously unidentified upstream kinases were reacted individually in a plate format with crude cell lysates and ATP. Phosphorylation rates were directly measured based on the addition of 90 same-sequence, site-specific phosphopeptides enriched in stable isotopes to act as ideal quantitative internal standards for analysis by liquid chromatography coupled to tandem mass spectrometry. This approach concurrently measured up to 90 site-specific peptide phosphorylation rates, reporting a diagnostic fingerprint for activated kinase pathways. We applied this unique kinome-activity profiling strategy in a variety of cellular settings, including mitogen stimulation, cell cycle, pharmacological inhibition of pathways, and to a panel of breast cancer cell lines. Finally, we identified the source of activity for a peptide (derived from a PI3K regulatory subunit) from our library. This peptide substrate demonstrated mitotic and tyrosine-specific phosphorylation, which was confirmed to be a novel Src family kinase site in vivo.

Original languageEnglish (US)
Pages (from-to)11606-11611
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume106
Issue number28
DOIs
StatePublished - Jul 14 2009

ASJC Scopus subject areas

  • General

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