Previous Article | Next Article ![]()
Molecular and Cellular Biology, December 1999, p. 8180-8190, Vol. 19, No. 12
Departament de Ciències Mèdiques
Bàsiques, Facultat de Medicina, Universitat de Lleida, 25198 Lleida, Spain
Received 4 August 1999/Returned for modification 10 September
1999/Accepted 21 September 1999
Glutaredoxins are members of a superfamily of thiol disulfide
oxidoreductases involved in maintaining the redox state of target proteins. In Saccharomyces cerevisiae, two glutaredoxins
(Grx1 and Grx2) containing a cysteine pair at the active site had been characterized as protecting yeast cells against oxidative damage. In
this work, another subfamily of yeast glutaredoxins (Grx3, Grx4, and
Grx5) that differs from the first in containing a single cysteine
residue at the putative active site is described. This trait is also
characteristic for a number of glutaredoxins from bacteria to humans,
with which the Grx3/4/5 group has extensive homology over two regions.
Mutants lacking Grx5 are partially deficient in growth in rich and
minimal media and also highly sensitive to oxidative damage caused by
menadione and hydrogen peroxide. A significant increase in total
protein carbonyl content is constitutively observed in grx5
cells, and a number of specific proteins, including transketolase,
appear to be highly oxidized in this mutant. The synthetic lethality of
the grx5 and grx2 mutations on one hand and of
grx5 with the grx3 grx4 combination on the other points to a complex functional relationship among yeast glutaredoxins, with Grx5 playing a specially important role in protection against oxidative stress both during ordinary growth conditions and after externally induced damage. Grx5-deficient mutants
are also sensitive to osmotic stress, which indicates a relationship
between the two types of stress in yeast cells.
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Grx5 Glutaredoxin Plays a Central Role in
Protection against Protein Oxidative Damage in
Saccharomyces cerevisiae
*
Corresponding author. Mailing address: Departament de
Ciències Mèdiques Bàsiques, Facultat de Medicina,
Universitat de Lleida, Rovira Roure 44, 25198 Lleida, Spain. Phone:
34-973-702409. Fax: 34-973-702426. E-mail:
enric.herrero{at}cmb.udl.es.
This article has been cited by other articles:
| J. Bacteriol. | J. Virol. | Eukaryot. Cell |
|---|
| Microbiol. Mol. Biol. Rev. | Clin. Vaccine Immunol. | All ASM Journals |
|---|