The lack of substrate-bound crystal structures of SIRT1 and SIRT2 complicates the drug design for these targets. In this work, we aim to study whether SIRT3 could serve as a target structure in the design of substrate based pseudopeptidic inhibitors of SIRT1 and SIRT2. We created a binding hypothesis for pseudopeptidic inhibitors, synthesized a series of inhibitors, and studied how well the fulfillment of the binding criteria proposed by the hypothesis correlated with the in vitro inhibitory activities. The chosen approach was further validated by studying docking results between 12 different SIRT3, Sir2Tm, SIRT1 and SIRT2 X-ray structures and homology models in different conformational forms. It was concluded that the created binding hypothesis can be used in the design of the substrate based inhibitors of SIRT1 and SIRT2 although there are some reservations, and it is better to use the substrate-bound structure of SIRT3 instead of the available apo-SIRT2 as the target structure.

A new inhibitor for human sirtuin type proteins 1 and 2 (SIRT1 and SIRT2) was discovered through virtual database screening in search of new scaffolds. A series of compounds was synthesized based on the hit compound (3-[[3-(4-tert-butylphenyl)1,2,4-oxadiazole-5-carbonyl]amino]-1-[3-(trifluoromethyl)phenyl]thiourea). The most potent compound in the series was nearly as potent as the reference compound (6-chloro-2,3,4,9-tetrahydro-1H-carbazole-1-carboxamide).

Sirtuins are NAD-dependent histone deacetylases, which cleave the acetyl-group from acetylated proteins, such as histones but also the acetyl groups from several transcription factors, and in this way can change their activities. Of all seven mammalian SirTs, the human sirtuin SirT1 has been the most extensively studied. However, there is no crystal structure or comparative model reported for SirT1. We have therefore built up a three-dimensional comparison model of the SirT1 protein catalytic core (domain area from residues 244 to 498 of the full length SirT1) in order to assist in the investigation of active site-ligand interactions and in the design of novel SirT1 inhibitors. In this study we also propose the binding-mode of recently reported set of indole-based inhibitors in SirT1. The site of interaction and the ligand conformation were predicted by the use of molecular docking techniques. To distinguish between active and inactive compounds, a post-docking filter based on H-bond network was constructed. Docking results were used to investigate the pharmacophore and to identify a filter for database mining.

No abstract

SIRT6 belongs to the family of histone deacetylases (class III), but it also has mono-ADP-ribosyltransferase activity. SIRT6 is a nuclear sirtuin that has been associated with aging, cellular protection, and sugar metabolism. Despite these important roles for SIRT6, thus far, there are only a few weak SIRT6 inhibitors available, and no structure-activity relationship (SAR) studies have been published. This is the first study concerning peptides and pseudopeptides as SIRT6 deacetylation inhibitors and the first SAR data concerning SIRT6. We also investigated the molecular interactions using a homology model. We report three compounds exhibiting 62-91% SIRT6 inhibition at 200 μM concentration. These compounds can serve as starting points for systematic SAR studies and SIRT6 inhibitor design.