日本慢生根瘤菌中两组亚极鞭毛的特性分析
Characterization of two sets of subpolar flagella in Bradyrhizobium japonicum.
作者信息
Kanbe Masaomi, Yagasaki Jin, Zehner Susanne, Göttfert Michael, Aizawa Shin-Ichi
机构信息
Department of Life Sciences, Prefectural University of Hiroshima, 562 Nanatsuka, Shobara, Hiroshima 727-0023, Japan.
出版信息
J Bacteriol. 2007 Feb;189(3):1083-9. doi: 10.1128/JB.01405-06. Epub 2006 Nov 10.
Abstract
Bradyrhizobium japonicum is one of the soil bacteria that form nodules on soybean roots. The cell has two sets of flagellar systems, one thick flagellum and a few thin flagella, uniquely growing at subpolar positions. The thick flagellum appears to be semicoiled in morphology, and the thin flagella were in a tight-curly form as observed by dark-field microscopy. Flagellin genes were identified from the amino acid sequence of each flagellin. Flagellar genes for the thick flagellum are scattered into several clusters on the genome, while those genes for the thin flagellum are compactly organized in one cluster. Both types of flagella are powered by proton-driven motors. The swimming propulsion is supplied mainly by the thick flagellum. B. japonicum flagellar systems resemble the polar-lateral flagellar systems of Vibrio species but differ in several aspects.
摘要
慢生根瘤菌是能在大豆根上形成根瘤的土壤细菌之一。该细胞有两组鞭毛系统，一根粗鞭毛和几根细鞭毛，独特地生长在亚极位置。粗鞭毛在形态上似乎是半卷曲的，通过暗视野显微镜观察，细鞭毛呈紧密卷曲的形式。从每种鞭毛蛋白的氨基酸序列中鉴定出鞭毛蛋白基因。粗鞭毛的鞭毛基因分散在基因组中的几个簇中，而细鞭毛的那些基因紧密地组织在一个簇中。两种类型的鞭毛都由质子驱动的马达提供动力。游动推进主要由粗鞭毛提供。慢生根瘤菌的鞭毛系统类似于弧菌属的极侧鞭毛系统，但在几个方面有所不同。
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