Yeong-Renn Chen, Chwen-Lih Chen, Douglas R Pfeiffer, and Jay L. Zweier
Mitochondrial complex II in post-ischemic heart: Oxidative injury and the role of protein S-glutathionylation
J. Biol. Chem, 10.1074/jbc.M702294200
(Complex II was glutathionylated at C90 which is C46 in the mature sequence, 10 residues from the FAD covalent attachment site and spatially near the surface and near the adenine end of FAD. )
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Actually C90/C46 is about 12 A from the surface, in fairly densely packed protein. It seems likely a conformational change would be required to acommodate GSH, much less expose the site to GSH in solution.
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