Szczepankiewicz BG, Dai H, Koppetsch KJ, Qian D, Jiang F, Mao C, Perni RB. Synthesis of carba-NAD and the structures of its ternary complexes with SIRT3 and SIRT5.
J Org Chem 2012;
77:7319-29. [PMID:
22849721 DOI:
10.1021/jo301067e]
[Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Carba-NAD is a synthetic compound identical to NAD except for one substitution, where an oxygen atom adjacent to the anomeric linkage bearing nicotinamide is replaced with a methylene group. Because it is inert in nicotinamide displacement reactions, carba-NAD is an unreactive substrate analogue for NAD-consuming enzymes. SIRT3 and SIRT5 are NAD-consuming enzymes that are potential therapeutic targets for the treatment of metabolic diseases and cancers. We report an improved carba-NAD synthesis, including a pyrophosphate coupling method that proceeds in approximately 60% yield. We also disclose the X-ray crystal structures of the ternary complexes of SIRT3 and SIRT5 bound to a peptide substrate and carba-NAD. These X-ray crystal structures provide critical snapshots of the mechanism by which human sirtuins function as protein deacylation catalysts.
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