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首页> 外文期刊>Archives of microbiology >Dehalobacter restrictus gen. nov. and sp. nov., a strictly anaerobic bacterium that reductively dechlorinates tetra- and trichloroethene in an anaerobic respiration
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Dehalobacter restrictus gen. nov. and sp. nov., a strictly anaerobic bacterium that reductively dechlorinates tetra- and trichloroethene in an anaerobic respiration

机译：限制性脱氢杆菌属。十一月和sp。 nov。，一种严格厌氧的细菌，可在厌氧呼吸中还原四氯乙烯和三氯乙烯

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摘要

The highly enriched anaerobic bacterium that couples the reductive dechlorination of tetrachloroethene to growth, previously referred to as PER-K23, was obtained in pure culture and characterized. The bacterium, which does not form spores, is a small, gram-negative rod with one lateral flagellum. It utilized only H-2 as an electron donor and tetrachloroethene and trichloroethene as electron accepters in an anaerobic respiration process; it could not grow fermentatively. Acetate served as a carbon source in a defined medium containing iron as the sole trace element, the two vitamins thiamine and cyanocobalamin, and the three amino acids arginine, histidine, and threonine. The cells contained menaquinones and b-type cytochromes. The G+C content of the DNA was 45.3 +/- 0.3 mol%. The cell wall consisted of type-A3 gamma peptidoglycan with LL-diaminopimelic acid and one glycine as an interpeptide bridge. The cells are surrounded by an S-layer, an outer membrane was absent. Comparative sequence analysis of the 16S rRNA sequence showed that PER-K23 is related to gram-positive bacteria with a low G+C content of the DNA, Based on the cytological, physiological, and phylogenetic characterization, it is proposed to affiliate the isolate to a new genus, Dehalobacter, with PER-K23 as the type strain of the new species Dehalobacter restrictus. [References: 54]
机译：在纯培养中获得并表征了高浓度厌氧细菌，该细菌将四氯乙烯的还原性脱氯作用与生长结合在一起，以前称为PER-K23。这种不形成孢子的细菌是一种小的革兰氏阴性杆，带有一个侧鞭毛。在厌氧呼吸过程中，它仅利用H-2作为电子供体，并利用四氯乙烯和三氯乙烯作为电子受体。它无法发酵生长。乙酸盐在特定的介质中充当碳源，该介质包含铁作为唯一的微量元素，两种维生素硫胺素和氰钴胺素以及三种氨基酸精氨酸，组氨酸和苏氨酸。这些细胞含有甲萘醌和b型细胞色素。 DNA的G + C含量为45.3 +/- 0.3mol％。细胞壁由具有LL-二氨基庚二酸和一个甘氨酸作为肽间桥的A3型γ肽聚糖组成。细胞被S层包围，不存在外膜。对16S rRNA序列的比较序列分析表明，PER-K23与DNA的G + C含量低的革兰氏阳性细菌有关，基于细胞学，生理学和系统发育的特征，建议将分离物与一个新属，Dehalobacter，以PER-K23为新种Dehalobacterstrictus的类型菌株。 [参考：54]

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