Kuroda Masashi, Ishimoto Iori, Kameoka Chisato, Kawanishi Toshiki, Saito Ren, Toki Hajime, Yamagishi Hiroya, Watanabe Yuzuki, Tani Yukinori
Faculty of Social and Environmental Studies, Tokoha University, 6-1 Yayoi-cho, Shizuoka 422-8581, Japan.
Department of Environmental Health Sciences, Graduate School of Nutritional and Environmental Sciences, University of Shizuoka, 52-1 Yada, Shizuoka 422-8526, Japan.
Microorganisms. 2025 Jul 16;13(7):1675. doi: 10.3390/microorganisms13071675.
The role of bacterial selenium metabolism in non-polluted environments remains underexplored within the selenium biogeochemical cycle. In this study, selenium-metabolizing bacteria were isolated from urban environmental samples. Among 12 isolates, 10 were identified as spp., while the remaining 2 were and . The isolates demonstrated high selenium-removal efficiency, removing over 95% of 5 mM selenium from the aqueous phase within one week. In contrast, K24-1 and K24-4 removed only 19% and 69%, respectively. A detailed investigation of five representative isolates, K21-1, K24-1, K24-2, K24-4, and K24-5, revealed that spp. efficiently reduced selenate directly to elemental selenium, with minimal accumulation of selenite intermediates. These results highlight spp. as key selenium reducers and suggest their potential as bioindicators of selenium metabolic capacity in the environment.
在硒生物地球化学循环中，细菌硒代谢在未受污染环境中的作用仍未得到充分探索。在本研究中，从城市环境样本中分离出了硒代谢细菌。在12株分离菌株中，10株被鉴定为 属，其余2株为 属和 属。 属分离菌株表现出较高的硒去除效率，在一周内从水相中去除了超过95%的5 mM硒。相比之下， K24 - 1和 K24 - 4分别仅去除了19%和69%。对5株代表性分离菌株 K21 - 1、 K24 - 1、 K24 - 2、 K24 - 4和 K24 - 5的详细研究表明， 属能有效地将硒酸盐直接还原为元素硒，亚硒酸盐中间体的积累极少。这些结果突出了 属作为关键硒还原剂的地位，并表明它们作为环境中硒代谢能力生物指示剂的潜力。
