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2014 ; 289
(44
): 30763-30771
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Critical role for lysine 685 in gene expression mediated by transcription factor
unphosphorylated STAT3
#MMPMID25217633
Dasgupta M
; Unal H
; Willard B
; Yang J
; Karnik SS
; Stark GR
J Biol Chem
2014[Oct]; 289
(44
): 30763-30771
PMID25217633
show ga
STAT3 is a pleiotropic transcription factor that is activated by the
phosphorylation of tyrosine 705 in response to many cytokines and growth factors.
STAT3 without Tyr-705 phosphorylation (U-STAT3) is also a potent transcription
factor, and its concentration in cells increases greatly in response to STAT3
activation because the STAT3 gene can be driven by phosphorylated STAT3 dimers.
We have now searched for post-translational modifications of U-STAT3 that might
have a critical role in its function. An analysis by mass spectroscopy indicated
that U-STAT3 is acetylated on Lys-685, and the integrity of Lys-685 is required
for the expression of most U-STAT3-dependent genes. In contrast, we found only a
very minor role for Lys-685 in gene expression induced in response to
tyrosine-phosphorylated STAT3. U-STAT3 plays an important role in angiotensin
II-induced gene expression and in the consequent development of cardiac
hypertrophy and dysfunction. Mutation of Lys-685 inhibits this function of STAT3,
providing new information on the role of U-STAT3 in augmenting the development of
heart failure.