期刊
ENVIRONMENTAL MICROBIOLOGY REPORTS
卷 9, 期 5, 页码 612-617出版社
WILEY
DOI: 10.1111/1758-2229.12548
关键词
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资金
- BioGreen 21 program from the Rural Development Administration of Korea [PJ011949]
- Bio-industry Technology Development Program of IPET (Korea Institute of Planning and Evaluation for Technology in Food, Agriculture, Forestry, and Fisheries) [316025-05]
- Catholic Kwandong University International St. Mary's Hospital [CKURF-201406880001, CKURF-201604820001]
Methionine synthase (MetE, EC 2.1.1.14) catalyses the final step in the methionine biosynthetic pathway. Methionine biosynthesis plays a major role in protein biogenesis and is the source of S-adenosyl methionine (SAM), the universal donor of methyl groups. In this study, we demonstrated that BbMetE acts as a typical MetE enzyme in the entomopathogenic fungus Beauveria bassiana. In addition, we found that BbMetE binds to calmodulin (CaM) in vitro and in vivo. The functional role of CaM binding to BbMetE was to negatively regulate BbMetE activity in B. bassiana. Our proton-nuclear magnetic resonance data revealed that CaM inhibitor W-7 increases methionine content in B. bassiana, suggesting that CaM negatively regulates the BbMetE activity. Environmental stress stimuli such as salt, H2O2 and heat suppressed BbMetE activity in B. bassiana. W-7 reversed this effect, suggesting that the inhibitory mechanism is mediated through stimulation of CaM activity. Therefore, this work suggests that BbMetE plays an important role in methionine biosynthesis, which is mediated by environmental stress stimuli via the CaM signalling pathway.
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