Identification of benzofuran-3-yl(phenyl)methanones as novel SIRT1 inhibitors: Binding mode, inhibitory mechanism and biological action
作者:Jiahui Wu、Yi Li、Kaixian Chen、Hualiang Jiang、Ming-Hua Xu、Dongxiang Liu
DOI:10.1016/j.ejmech.2012.12.026
日期:2013.2
SIRT1 is a NAD(+)-dependent deacetylase. Here we described new SIRT1 inhibitors with the scaffold of benzofuran-3-yl(phenyl)methanone. The inhibitors were predicted to bind in C-pocket of SIRT1, forming hydrophobic interactions with Phe273, Phe312 and Ile347. Introducing hydroxyl to meta position of phenyl may form H-bond with Asn346. Indeed, (2,5-dihydroxyphenyl)(5-hydroxy-1-benzofuran-3-yl) methanone (16), an analogue with hydroxyls at ortho and meta positions, showed greater inhibition. The binding mode was validated by structural modifications and kinetic studies. Since C-pocket is the site where the nicotinamide moiety of NAD(+) binds and the hydrolysis takes place, binding of 16 in C-pocket would block the transformation of NAD(+) to productive conformation and hence inhibit the deacetylase activity. Consistently, 16 inhibited SIRT1 through up-regulating p53 acetylation on cellular level. (C) 2012 Elsevier Masson SAS. All rights reserved.