Meta-Biol

• Pathways

Sirtuin 1 (SIRT1) functions as a NAD(+)-dependent deacetylase, which regulates the heat shock response through deacetylation of HSF1 at Lys80. The acetylation at Lys80, which is located within DNA binding domain of HSF1 disrupts HSF1 DNA-binding ability. SIRT1-mediated stress-inducible regulation of HSF1 results in prolonged HSF1 binding to the heat shock promoter of hsp70 gene. The mechanism of the enzymatic reaction which couples NAD(+) hydrolysis with lysine deacetylation in the presence of acetylated peptide is described by several groups (Landry J et al. 2000; Sauve AA et al. 2001)