irrE, an exogenous gene from deinococcus radiodurans, improves the growth of and ethanol production by a Zymomonas mobilis strain under ethanol and acid stresses
文献类型: 外文期刊
作者: Zhang Ying;Ma, Ruiqiang;Zhou, Zhengfu;Lu, Wei;Zhang, Wei;Chen, Ming;Zhang Ying;Ma, Ruiqiang;Zhao, Zhonglin
作者机构:
关键词: Abiotic stress tolerance;Ethanol productivity;irrE expression;Zymomonas mobilis
期刊名称: JOURNAL OF MICROBIOLOGY AND BIOTECHNOLOGY
ISSN:
年卷期:
页码:
收录情况: SCI
摘要: During ethanol fermentation, bacterial strains may encounter various stresses, such as ethanol and acid shock, which adversely affect cell viability and the production of ethanol. Therefore, ethanologenic strains that tolerate abiotic stresses are highly desirable. Bacteria of the genus Deinococcus are extremely resistant to ionizing radiation, ultraviolet light, and desiccation, and therefore constitute an important pool of extreme resistance genes. The irrE gene encodes a general switch responsible for the extreme radioresistance of D. radiodurans. Here, we present evidence that IrrE, acting as a global regulator, confers high stress tolerance to a Zymomonas mobilis strain. Expression of the gene protected Z. mobilis cells against ethanol, acid, osmotic, and thermal shocks. It also markedly improved cell viability, the expression levels and enzyme activities of pyruvate decarboxylase and alcohol dehydrogenase, and the production of ethanol under both ethanol and acid stresses. These data suggest that irrE is a potentially promising gene for improving the abiotic stress tolerance of ethanologenic bacterial strains.
分类号: Q93
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