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首页> 外文期刊>Applied Microbiology and Biotechnology >Extracellular reduction of selenite by a novel marine photosynthetic bacterium
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Extracellular reduction of selenite by a novel marine photosynthetic bacterium

机译：一种新型海洋光合细菌在细胞外还原亚硒酸盐

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摘要

A novel purple nonsulfur bacterium strain NKPB030619, which has resistance to over 5 mM selenite, was isolated from a marine environment. An initial concentration of 1.1 mM selenite, added to the medium, was decreased to under 0.05 mM within 5 days. The color of the cell suspension turned red within 2 days. The red coloration gradually decreased and black precipitates appeared during 2 weeks of cultivation. Under these conditions, two main types of deposit were formed extracellularly. These deposits were thought to contain red amorphous selenium and black vitreous selenium. The selenite reduction to elemental selenium in this bacterium was induced by the introduction of light and L-malic acid under anaerobic conditions. These results suggest that selenite reduction is coupled with photosynthesis and L-malic acid can serve as the indirect electron donor for its reduction. Phylogenetic analysis based on the 16S rDNA sequence showed that NKPB0360619 belongs to the alpha subdivision of Proteobacteria and is classified into the Rhodobacter species. The highest similarity of 86.2% was observed with R. sphaeroides.
机译：从海洋环境中分离出一种新型的紫色非硫细菌菌株NKPB030619，它对5 mM以上的亚硒酸盐具有抗性。添加到培养基中的亚硒酸盐的初始浓度为1.1 mM，在5天内降至0.05 mM以下。细胞悬液的颜色在2天内变成红色。在培养2周的过程中，红色逐渐减少，黑色沉淀出现。在这些条件下，两种主要类型的沉积物在细胞外形成。这些沉积物被认为含有红色无定形硒和黑色玻璃态硒。在厌氧条件下，通过引入光和L-苹果酸可诱导该细菌将亚硒酸盐还原为元素硒。这些结果表明亚硒酸盐的还原与光合作用结合，L-苹果酸可以作为其还原的间接电子供体。基于16S rDNA序列的系统发育分析表明，NKPB0360619属于变形杆菌的α细分，并被分类为红细菌属。球形球菌的最高相似度为86.2％。

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