Mechanism-Based Inhibitors of the Human Sirtuin 5 Deacylase: Structure-Activity Relationship, Biostructural, and Kinetic Insight
作者:Nima Rajabi、Marina Auth、Kathrin R. Troelsen、Martin Pannek、Dhaval P. Bhatt、Martin Fontenas、Matthew D. Hirschey、Clemens Steegborn、Andreas S. Madsen、Christian A. Olsen
DOI:10.1002/anie.201709050
日期:2017.11.20
The sirtuin enzymes are important regulatory deacylases in a variety of biochemical contexts and may therefore be potential therapeutic targets through either activation or inhibition by small molecules. Here, we describe the discovery of the most potent inhibitor of sirtuin5 (SIRT5) reported to date. We provide rationalization of the mode of binding by solving co‐crystal structures of selected inhibitors
Collectively, compound A10 represented a promising potent and selective PI3Kδ inhibitor bearing amino acid fragement albeit with moderate selectivity over PI3Kγ but superior selectivity against PI3Kα and β. This study suggested that using the amino acid fragments instead of the pyrrolidine ring is new strategy for design of potent PI3Kδ inhibitors.
To evaluate the contribution of triethylsilyl a,a-di-n-propylglycine, namely TESDpg, to induce a defined secondary structure, we have prepared model tripeptides in which TESDpg was inserted in three different positions. Studies in solid state and in solution with adapted techniques showed that TESDpg was able to induce a nascent 310 helix in both crystal and solution states.
The silaproline-containing dipeptide N-(3,3-dimethyl-1-pivaloyl-1-aza-3-sila-5-cyclopentylcarbonyl)-L-alanine isopropylamide, C17H33N3O3Si, has two independent molecules in the asymmetric unit and each adopts a beta -II folded conformation, where the amide on the terminal C interacts intramolecularly with the pivaloyl O atom. The five-membered silaproline ring is C-beta-puckered, an infrequent conformation for the homologous proline ring.