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Combinatorial regulation of a signal-dependent activator by phosphorylation and acetylation.


ABSTRACT: In the fasted state, increases in catecholamine signaling promote adipocyte function via the protein kinase A-mediated phosphorylation of cyclic AMP response element binding protein (CREB). CREB activity is further up-regulated in obesity, despite reductions in catecholamine signaling, where it contributes to the development of insulin resistance. Here we show that obesity promotes the CREB binding protein (CBP)-mediated acetylation of CREB at Lys136 in adipose. Under lean conditions, CREB acetylation was low due to an association with the energy-sensing NAD(+)-dependent deacetylase SirT1; amounts of acetylated CREB were increased in obesity, when SirT1 undergoes proteolytic degradation. Whereas CREB phosphorylation stimulated an association with the KIX domain of CBP, Lys136 acetylation triggered an interaction with the CBP bromodomain (BRD) that augmented recruitment of this coactivator to the promoter. Indeed, coincident Ser133 phosphorylation and Lys136 acetylation of CREB stimulated the formation of a ternary complex with the KIX and BRD domains of CBP by NMR analysis. As disruption of the CREB:BRD complex with a CBP-specific BRD inhibitor blocked effects of CREB acetylation on target gene expression, our results demonstrate how changes in nutrient status modulate cellular gene expression in response to hormonal signals.

SUBMITTER: Paz JC 

PROVIDER: S-EPMC4260582 | biostudies-literature | 2014 Dec

REPOSITORIES: biostudies-literature

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Combinatorial regulation of a signal-dependent activator by phosphorylation and acetylation.

Paz Jose C JC   Park Sangho S   Phillips Naomi N   Matsumura Shigenobu S   Tsai Wen-Wei WW   Kasper Lawryn L   Brindle Paul K PK   Zhang Guangtao G   Zhou Ming-Ming MM   Wright Peter E PE   Montminy Marc M  

Proceedings of the National Academy of Sciences of the United States of America 20141117 48


In the fasted state, increases in catecholamine signaling promote adipocyte function via the protein kinase A-mediated phosphorylation of cyclic AMP response element binding protein (CREB). CREB activity is further up-regulated in obesity, despite reductions in catecholamine signaling, where it contributes to the development of insulin resistance. Here we show that obesity promotes the CREB binding protein (CBP)-mediated acetylation of CREB at Lys136 in adipose. Under lean conditions, CREB acety  ...[more]

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