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HOME > J. Microbiol > Volume 46(4); 2008 > Article
Research Support, Non-U.S. Gov't
The Role and Regulation of Trx1, a Cytosolic Thioredoxin in Schizosaccharomyces pombe
Ji-Yoon Song , Jung-Hye Roe
Journal of Microbiology 2008;46(4):408-414.
DOI: https://doi.org/10.1007/s12275-008-0076-4
Published online: August 31, 2008
Laboratory of Molecular Microbiology, School of Biological Sciences and Institute of Microbiology, Seoul National University, Seoul 151-742, Republic of KoreaLaboratory of Molecular Microbiology, School of Biological Sciences and Institute of Microbiology, Seoul National University, Seoul 151-742, Republic of Korea
Corresponding author:  Jung-Hye Roe , Tel: 82-2-880-6706, 
Received: 26 March 2008   • Accepted: 26 May 2008
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Abstract

The genome of fission yeast Schizosaccharomyces pombe harbors two genes for thioredoxins, trx1+ and trx2+, which encode cytosolic and mitochondrial thioredoxins, respectively. The Δtrx1 mutant was found sensitive to diverse external stressors such as various oxidants, heat, and salt, whereas Δtrx2 mutant was not sensitive except to paraquat, a superoxide generator. Both Δtrx1 and Δtrx2 mutants were more resistant to diamide, a thiol-specific oxidant, than the wild type. The trx1+ gene expression was induced by H2O2 and menadione, being mediated through a stress-responsive transcription factor Pap1. In Δtrx1 cells, the basal expression of Pap1-regulated genes were elevated, suggesting a role for Trx1 as a reducer for oxidized (activated) Pap1. The Δtrx1 mutant exhibited cysteine auxotrophy, which can be overcome by adding sulfite. This suggests that Trx1 serves as a primary electron donor for 3’-phosphoadenosine-5’-phosphosulfate (PAPS) reductase and thus is an essential protein for sulfur assimilation in S. pombe. These results suggest that, in contrast to Trx2 whose role is more confined to mitochondrial functions, Trx1 plays a major role in protecting S. pombe against various stressful conditions and enables proper sulfur metabolism.

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    The Role and Regulation of Trx1, a Cytosolic Thioredoxin in Schizosaccharomyces pombe
    J. Microbiol. 2008;46(4):408-414.   Published online August 31, 2008
    DOI: https://doi.org/10.1007/s12275-008-0076-4
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