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Yap1-dependent oxidative stress response provides a link to riboflavin production in Ashbya gossypii
- Source :
-
Fungal Genetics & Biology . Sep2012, Vol. 49 Issue 9, p697-707. 11p. - Publication Year :
- 2012
-
Abstract
- Abstract: Ashbya gossypii is a natural overproducer of riboflavin. Overproduction of riboflavin can be induced by environmental stress, e.g. nutritional or oxidative stress. The Yap-protein family has a well-documented role in stress response. Particularly, Yap1 has a major role in directing the oxidative stress responses. The A. gossypii YAP-family consists of only three genes in contrast to its closest relative Eremothecium cymbalariae, which has four YAP-homologs. Gene order at Eremothecium YAP-loci is conserved with the reconstructed yeast ancestor. AgYap1p is unique amongst Yap-homologs as it lacks the cysteine-rich domains (CRDs). AgYAP1 expression is inducible and GFP-AgYap1 localizes to the nucleus. Agyap1 mutants displayed higher sensitivity against oxidative stress – H2O2 and menadione - and are strongly reduced in riboflavin production. High levels of cAMP, which also reduce riboflavin production, show a synergistic effect on this sensitivity. AgYAP1 and a chimera of AgYAP1 (with the DNA-binding domain) and ScYAP1 (with the CRDs) can both complement the Scyap1 oxidative stress sensitivity. This suggests that the DNA-binding sites of ScYap1 are conserved in A. gossypii. Expression of AgRIB4, which contains three putative Yap1-binding sites, assayed via a lacZ-reporter gene was strongly reduced in an Agyap1 mutant suggesting a direct involvement of AgYap1 in riboflavin production. Furthermore, our data show that application of H2O2 stress leads to an increase in riboflavin production in a Yap1-dependent manner. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 10871845
- Volume :
- 49
- Issue :
- 9
- Database :
- Academic Search Index
- Journal :
- Fungal Genetics & Biology
- Publication Type :
- Academic Journal
- Accession number :
- 79045784
- Full Text :
- https://doi.org/10.1016/j.fgb.2012.06.006