Sirtuin-1 (SIRT1) is an NAD+-dependent protein deacetylase that is sensitive to oxidative signals. Our purpose was to determine whether SIRT1 activity is sensitive to the low molecular weight nitrosothiol, S-nitrosoglutathione (GSNO), which can transduce oxidative signals into physiological responses. SIRT1 formed mixed disulfides with GSNO-Sepharose, and mass spectrometry identified several cysteines that are modified by GSNO, including Cys-67 which was S-glutathiolated. GSNO had no effect on basal SIRT1deacetylase activity, but inhibited stimulation of activity by resveratrol (RSV) with an IC50 of 69 μM. These observations indicate that S-glutathiolation of SIRT1 by low concentrations of reactive glutathione can modulate its enzymatic activity.
Antioxid. Redox Signal.
13, 1023–1032.
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