Quantifying Kinase-Specific Phosphorylation Stoichiometry Using Stable Isotope Labeling In a Reverse In-Gel Kinase Assay.

Quantifying Kinase-Specific Phosphorylation Stoichiometry Using Stable Isotope Labeling In a Reverse In-Gel Kinase Assay.
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DOI:
10.1021/acs.analchem.6b02599
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发表时间:
2016-12-06
影响因子:
7.4
通讯作者:
Bieberich, Charles J.
Bieberich, Charles J.
中科院分区:
化学1区
文献类型:
--
作者:
Li, Xiang;Cox, Jonathan T.;Huang, Weiliang;Kane, Maureen;Tang, Keqi;Bieberich, Charles J.

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Despite recent advancements in large-scale phospho-proteomics, methods to quantify kinase-specific phosphorylation stoichiometry of protein substrates are lacking. We developed a method to quantify kinase-specific phosphorylation stoichiometry by combining the reverse in-gel kinase assay (RIKA) with high resolution LC-MS. Beginning with predetermined ratios of phosphorylated to non-phosphorylated Protein Kinase CK2 (CK2) substrate molecules, we employed 18O-ATP as the phosphate donor in a RIKA, then quantified the ratio of 18O-versus 16O-labeled tryptic phosphopeptide using high mass accuracy MS. We demonstrate that the phosphorylation stoichiometry determined by this method across a broad percent phosphorylation range correlated extremely well with the predicted value (correlation coefficient =0.99). This approach provides a quantitative alternative to antibody-based methods of determining the extent of phosphorylation of a substrate pool.
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