Posttranslational modification of glyceraldehyde-3-phosphate dehydrogenase by S-nitrosylation and subsequent NADH attachment.

Published

Journal Article

Nitric oxide (NO)-related activity has been associated with an NAD+-dependent modification of the glycolytic enzyme, glyceraldehyde-3-phosphate dehydrogenase (GAPDH). However, the mechanism by which NO effects covalent attachment of nucleotide and its role in regulation of enzyme activity are controversial. Recent studies have shown that S-nitrosylation of GAPDH (Cys149) initiates subsequent modification by the pyridinium cofactor. Here we show that NADH rather than NAD+ is the preferred substrate. Transnitrosation from active site S-nitrosothiol to the reduced nicotinamide ring system appears to facilitate protein thiolate attack on the enzyme-bound cofactor. This results in attachment of the intact NADH molecule. Moreover, we find that S-nitrosylation of GAPDH is responsible for reversible enzyme inhibition, whereas attachment of NADH accounts for irreversible enzyme inactivation. S-Nitrosylation may serve to protect GAPDH from oxidant inactivation in settings of cytokine overproduction and to regulate glycolysis. NADH attachment is more likely to be a pathophysiological event associated with inhibition of gluconeogenesis.

Full Text

Duke Authors

Cited Authors

  • Mohr, S; Stamler, JS; Brüne, B

Published Date

  • February 23, 1996

Published In

Volume / Issue

  • 271 / 8

Start / End Page

  • 4209 - 4214

PubMed ID

  • 8626764

Pubmed Central ID

  • 8626764

International Standard Serial Number (ISSN)

  • 0021-9258

Digital Object Identifier (DOI)

  • 10.1074/jbc.271.8.4209

Language

  • eng

Conference Location

  • United States