Sirt1 carboxyl-domain is an ATP-repressible domain that is transferrable to other proteins

The deacetylase Sirt1, known to regulate many cellular functions, can be activated by energy deprivation, however the mechanism is unclear. Here, the authors show that ATP inhibits Sirt1 by binding to the C-terminal domain, and energy deprivation derepresses Sirt1 activity by lowering the ATP level.