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2017 ; 17
(6
): ä Nephropedia Template TP
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Interrogating the hidden phosphoproteome
#MMPMID28165663
Kang UB
; Alexander WM
; Marto JA
Proteomics
2017[Mar]; 17
(6
): ä PMID28165663
show ga
Postgenomic studies continue to highlight the potential clinical importance of
protein phosphorylation signaling pathways in drug discovery. Unfortunately, the
dynamic range and variable stoichiometry of protein phosphorylation continues to
stymie efforts to achieve comprehensive characterization of the human
phosphoproteome. In this study, we develop a complementary, two-stage method for
enrichment of cysteine-containing phosphopeptides combined with TMT multiplex
labeling for relative quantification. The use of this approach with
multidimensional fractionation in mammalian cells yielded more than 7000 unique
cys-phosphopeptide sequences, comprising 15-20% novel phosphorylation sites. The
use of our approach in combination with pharmacologic inhibitors of the
mechanistic target of rapamycin complex 1 and 2 identified several putatively
novel protein substrates for the mechanistic target of rapamycin kinase.