PHYLOGENETIC POSITION OF THE GENUS HYDROGENOBACTER
PHYLOGENETIC POSITION OF THE GENUS HYDROGENOBACTER
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DOI：
10.1099/00207713-44-4-620
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发表时间：
1994-10-01
期刊：
影响因子：
--
通讯作者：
FOX, GE
中科院分区：
文献类型：
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作者：
PITULLE, C;YANG, YQ;FOX, GE
嗜氢菌属由极端嗜热、专性化能无机营养的生物组成，它们表现出厌氧厌氧但好氧催化的特性。基于有限的16 S核糖体DNA序列数据对这些生物的系统发育位置的初步研究表明，它们属于细菌的最早分支目之一。本研究测定了嗜热氢杆菌TK-6和嗜氢热破热杆菌Z-829两个模式菌株以及另一个分离株Hgdrogenophilus sp.菌株T3的16 S核糖体DNA全序列，并对这些生物的系统发育位置进行了研究。我们的研究结果表明，这两个模式菌株是一个单一的属，属氢。我们的研究结果也证实了以前的结论，Aquifex-Hydrogenolysis复合物属于一个非常早期的分支秩序，'' Aquificales。在这个目中，各种生物之间的关系是这样的，只有一个科，即Aquificaceae，在这个时候可以被识别。考虑到“Aquificales”的早期分支点，这些生物的特征支持现有生命的最后一个共同祖先是嗜热的观点，并表明这个祖先可能已经固定了碳的化学自养。
The genus Hydrogenobacter consists of extremely thermophilic, obligately chemolithotrophic organisms that exhibit anaerobic anabolism but aerobic catabolism. Preliminary studies of the phylogenetic position of these organisms based on limited 16S ribosomal DNA sequence data suggested that they belong to one of the earliest branching orders of the Bacteria. In this study, the complete 16S ribosomal DNA sequences of two type strains, Hydrogenobacter thermophilus TK-6 and Calderabacterium hydrogenophilum Z-829, and another isolate, Hgdrogenobacter sp. strain T3, were determined, and the phylogenetic positions of these organisms were examined. Our results revealed that the two type strains are members of a single genus, the genus Hydrogenobacter. Our results also verified the previous conclusion that the Aquifex-Hydrogenobacter complex belongs to a very early branching order, the ''Aquificales.'' Within this order, the relationships among the various organisms are such that only a single family, the ''Aquificaceae,'' can be recognized at this time. Given the early branching point of the ''Aquificales,'' the characteristics of these organisms support the view that the last common ancestor of existing life was thermophilic and suggest that this ancestor may have fixed carbon chemoautotrophically.