Mutations and environmental factors affecting regulation of riboflavin synthesis and iron assimilation also cause oxidative stress in the yeastPichia guilliermondii
| Autor: | Igor O. Mukalov, Tetiana M. Prokopiv, Yuriy R. Boretsky, Daria V. Fedorovych, Olga Protchenko, Andriy A. Sibirny |
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| Rok vydání: | 2007 |
| Předmět: |
Iron
Riboflavin Biology medicine.disease_cause Applied Microbiology and Biotechnology Pichia Microbiology Iron assimilation Microscopy Electron Transmission Gene Expression Regulation Fungal Malondialdehyde medicine Pichia guilliermondii Wild type food and beverages Cobalt General Medicine Iron deficiency biology.organism_classification medicine.disease Yeast Oxidative Stress Biochemistry Mutation Oxidative stress |
| Zdroj: | Journal of Basic Microbiology. 47:371-377 |
| ISSN: | 1521-4028 0233-111X |
| Popis: | Iron deficiency causes oversynthesis of riboflavin in several yeast species, known as flavinogenic yeasts. However, the mechanisms of such regulation are not known. We found that mutations causing riboflavin overproduction and iron hyperaccumulation (rib80, rib81 and hit1), as well as cobalt excess or iron deficiency all provoke oxidative stress in the Pichia guilliermondii yeast. Iron content in the cells, production both of riboflavin and malondialdehyde by P. guilliermondii wild type and hit1 mutant strains depend on a type of carbon source used in cultivation media. The data suggest that the regulation of riboflavin biosynthesis and iron assimilation in P. guilliermondii are linked with cellular oxidative state. |
| Databáze: | OpenAIRE |
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