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Saccharomyces cerevisiae Hsp31p, a stress response protein conferring protection against reactive oxygen species

Saccharomyces cerevisiae Hsp31p, a stress response protein conferring protection against reactive oxygen species

Free Radical Biology and Medicine 42(9): 1409-1420

ISSN/ISBN: 0891-5849

PMID: 17395014

DOI: 10.1016/j.freeradbiomed.2007.01.042

The Saccharomyces cerevisiae HSP31 (YDR533c) gene encodes a protein that belongs to the DJ-1/PfpI family and its function is unknown. Homologs to Hsp31p polypeptide can be found in organisms from all systematic groups of eukaryotes and prokaryotes, and the functions of the vast majority of them are also hypothetical. One of the homologs is human protein DJ-1. Various amino acid substitutions within this protein correlate with early onset hereditary Parkinson's disease. The deletion of the HSP31 gene displays no apparent phenotype under standard growth conditions, but a thorough functional analysis of S. cerevisiae revealed that its absence makes the cells sensitive to a subset of reactive oxygen species (ROS) generators. HSP31 is induced under conditions of oxidative stress in a YAP1-dependent manner. Similar to other stress response genes, it is also induced in the postdiauxic phase of growth and this induction is YAP1-independent. The patterns of sensitivities to various ROS generators of the hsp31Delta strain and the strain with the deletion of SOD1, another gene defending the cell against ROS, are different. We postulate that Hsp31p protects the cell against oxidative stress and complements other stress protection systems within the cell.

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Accession: 013266700

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