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2016 ; 15
(2
): 436-50
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Identification of Mediator Kinase Substrates in Human Cells using Cortistatin A
and Quantitative Phosphoproteomics
#MMPMID27050516
Poss ZC
; Ebmeier CC
; Odell AT
; Tangpeerachaikul A
; Lee T
; Pelish HE
; Shair MD
; Dowell RD
; Old WM
; Taatjes DJ
Cell Rep
2016[Apr]; 15
(2
): 436-50
PMID27050516
show ga
Cortistatin A (CA) is a highly selective inhibitor of the Mediator kinases CDK8
and CDK19. Using CA, we now report a large-scale identification of Mediator
kinase substrates in human cells (HCT116). We identified over 16,000 quantified
phosphosites including 78 high-confidence Mediator kinase targets within 64
proteins, including DNA-binding transcription factors and proteins associated
with chromatin, DNA repair, and RNA polymerase II. Although RNA-seq data
correlated with Mediator kinase targets, the effects of CA on gene expression
were limited and distinct from CDK8 or CDK19 knockdown. Quantitative proteome
analyses, tracking around 7,000 proteins across six time points (0-24 hr),
revealed that CA selectively affected pathways implicated in inflammation,
growth, and metabolic regulation. Contrary to expectations, increased turnover of
Mediator kinase targets was not generally observed. Collectively, these data
support Mediator kinases as regulators of chromatin and RNA polymerase II
activity and suggest their roles extend beyond transcription to metabolism and
DNA repair.