Transnitrosation of Thiols from Aliphatic <i>N</i>-Nitrosamines: <i>S</i>-Nitrosation and Indirect Generation of Nitric Oxide
作者:Takahiro Yanagimoto、Takeshi Toyota、Norio Matsuki、Yumi Makino、Seiichi Uchiyama、Tomohiko Ohwada
DOI:10.1021/ja0658259
日期:2007.1.1
S-Nitrosothiols and heme nitrosyl species are nitric oxide (NO)-derived metabolites that provide an endogenous reservoir of NO and also play roles in protein S-nitrosation, that is, transnitrosation of thiols (or thiolates) in proteins, thereby regulating protein functions and signal transduction pathways. Intriguingly, endogenous N-nitrosamines are present in similar abundance to S-nitrosothiols, and though they are thought to play similar physiological roles to S-nitrosothiols, their transnitrosation reactivities and their contribution to biological events are little understood. Herein we report aliphatic N-nitroso derivatives of 7-azabicyclo[2.2.1]heptanes, which do not act as NO donors themselves, but can transnitrosate thiols. On the basis of the calculated activation energies of transnitrosation and the aorta smooth-muscle relaxation activities of these N-nitrosamines, we present a possible scenario of Stransnitrosation from aliphatic N-nitrosamines, leading to indirect generation of NO.