Journal
CELL METABOLISM
Volume 14, Issue 2, Pages 219-230Publisher
CELL PRESS
DOI: 10.1016/j.cmet.2011.06.010
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Funding
- National Institutes of Health [DK058199, DE018183]
- Cancer Center (CORE) [P30 CA021765]
- American Lebanese Syrian Associated Charities of St. Jude Children's Research Hospital
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Opposing activities of acetyltransferases and deacetylases help regulate energy balance. Mice heterozygous for the acetyltransferase CREB binding protein (CBP) are lean and insulin sensitized, but how CBP regulates energy homeostasis is unclear. In one model, the main CBP interaction with the glucagon-responsive factor CREB is not limiting for liver gluconeogenesis, whereas a second model posits that Ser436 in the CH1 (TAZ1) domain of CBP is required for insulin and the antidiabetic drug metformin to inhibit CREB-mediated liver gluconeogenesis. Here we show that conditional knockout of CBP in liver does not decrease fasting blood glucose or gluconeogenic gene expression, consistent with the first model. However, mice in which the CBP CH1 domain structure is disrupted by deleting residues 342-393 (Delta CH1) are lean and insulin sensitized, as are p300 Delta CH1 mutants. CBP(Delta CH1/Delta CH1) mice remain metformin responsive. An intact CH1 domain is thus necessary for normal energy storage, but not for the blood glucose-lowering actions of insulin and metformin.
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