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首页> 外文期刊>Environmental Science & Technology >Novel Pathway for Vanadium(Ⅴ) Bio-Detoxification by Gram-Positive Lactococcus raffinolactis
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Novel Pathway for Vanadium(Ⅴ) Bio-Detoxification by Gram-Positive Lactococcus raffinolactis

机译：植物（Ⅳ）生物解毒的新型途径革兰氏阳性乳球菌醛氨基

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摘要

Whereas prospects of bio remediation for a vanadium(Ⅴ) [V(Ⅴ)]- contaminated environment are widely recognized, reported functional species are extremely limited, with the vast majority of Gram-negative bacteria in Proteobacteria. Herein, the effectiveness of V(Ⅴ) reduction is proved for the first time by Lactococcus raffinolactis, a Gram-positive bacterium in Firmicutes. The V(Ⅴ) removal efficiency was 86.5 ± 2.17% during 10-d operation, with an average removal rate of 4.32 ± 0.28 mg/L·d in a citrate-fed system correspondingly. V(Ⅴ) was bio-reduced to insoluble vanadium(Ⅳ) and distributed both inside and outside the cells. Nitrite reductase encoded by gene nirS mainly catalyzed intracellular V(Ⅴ) reduction, revealing a previously unrecognized pathway. Oxidative stress induced by reactive oxygen species from dissimilatory V(Ⅴ) reduction was alleviated through strengthened superoxide dismutase and catalase activities. Extracellular polymeric substances with chemically reactive hydroxyl (-OH) and carboxyl (-COO~-) groups also contributed to V(Ⅴ) binding and reduction as well as ROS scavenging. This study can improve the understanding of Gram-positiv bacteria for V(Ⅴ) bio-detoxification and offer microbial resources for bioremediation of a V(Ⅴ)-polluted environment.
机译：虽然钒的生物修复的前景（ⅴ）[v（ⅴ）] - 受污染的环境被广泛认识到，但报道的功能物种极为有限，具有绝大多数蛋菌在植物中的革兰氏阴性细菌。在此，V（Ⅵ）还原的有效性是第一次通过乳酸乳蛋白酶，革兰氏阳性细菌进行了重新证明。在10-D操作期间，V（Ⅵ）去除效率为86.5±2.17％，平均除去速率为4.32±0.28mg / L·d，相应地在柠檬酸盐送入系统中。 V（ⅴ）生物还原成不溶性钒（ⅳ）并分布在细胞内外。由基因NIR编码的亚硝酸盐还原酶主要催化细胞内V（Ⅵ）减少，揭示了先前未被识别的途径。通过加强超氧化物歧化酶和过氧化氢酶活性来缓解来自含量异化V（Ⅵ）的反应性氧物质诱导的氧化应激。具有化学反应性羟基（-OH）和羧基（-COO〜 - ）组的细胞外聚合物也有助于V（Ⅵ）结合和还原以及ROS清除。该研究可以改善对V（Ⅳ）生物排毒的克状细菌的理解，并为V（ⅴ） - 保存环境的生物修复提供微生物资源。

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  • 来源
    《Environmental Science & Technology》 |2021年第3期|2121-2131|共11页
  • 作者

    Baogang Zhang; Yina Li; Yangmei Fei; Yutong Cheng;

  • 作者单位

    School of Water Resources and Environment MOE Key Laboratory of Groundwater Circulation and Environmental Evolution China University of Geosciences (Beijing) Beijing 100083 P. R. China;

    School of Water Resources and Environment MOE Key Laboratory of Groundwater Circulation and Environmental Evolution China University of Geosciences (Beijing) Beijing 100083 P. R. China;

    School of Water Resources and Environment MOE Key Laboratory of Groundwater Circulation and Environmental Evolution China University of Geosciences (Beijing) Beijing 100083 P. R. China;

    School of Water Resources and Environment MOE Key Laboratory of Groundwater Circulation and Environmental Evolution China University of Geosciences (Beijing) Beijing 100083 P. R. China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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