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J. Biol. Chem., Vol. 277, Issue 19, 16853-16859, May 10, 2002
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From the Department of Biomolecular Sciences, University of
Manchester Institute of Science and Technology, Manchester M60 1QD,
United Kingdom and the The irreversible oxidation of cysteine residues
can be prevented by protein S-thiolation, a process by
which protein -SH groups form mixed disulfides with low molecular
weight thiols such as glutathione. We report here that this protein
modification is not a simple response to the cellular redox state,
since different oxidants lead to different patterns of protein
S-thiolation. SDS-polyacrylamide gel electrophoresis shows
that glyceraldehyde-3-phosphate dehydrogenase (GAPDH) is the major
target for modification following treatment with hydroperoxides
(hydrogen peroxide or tert-butylhydroperoxide), whereas
this enzyme is unaffected following cellular exposure to the thiol
oxidant diamide. Further evidence that protein S-thiolation is tightly regulated in response to oxidative stress is provided by the
finding that the Tdh3 GAPDH isoenzyme, and not the Tdh2 isoenzyme, is
S-thiolated following exposure to
H2O2 in vivo, whereas both GAPDH
isoenzymes are S-thiolated when
H2O2 is added to cell-free extracts. This
indicates that cellular factors are likely to be responsible for the
difference in GAPDH S-thiolation observed in
vivo rather than intrinsic structural differences between the
GAPDH isoenzymes. To begin to search for factors that can regulate the
S-thiolation process, we investigated the role of the
glutaredoxin family of oxidoreductases. We provide the first evidence
that protein dethiolation in vivo is regulated by a
monothiol-glutaredoxin rather than the classical glutaredoxins, which contain two active site cysteine residues. In particular, glutaredoxin 5 is required for efficient dethiolation of the Tdh3 GAPDH isoenzyme.
Regulation of Protein S-Thiolation by Glutaredoxin 5 in the Yeast Saccharomyces cerevisiae*
,
, and
School of Biochemistry and
Molecular Genetics, University of New South Wales,
Sydney, New South Wales 2052, Australia
*
This work was supported by Biotechnology and Biological
Sciences Research Council Grant 36/C13319.The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
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