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首页> 外文期刊>Journal of Molecular Biology >Early evolution of cytochrome bc complexes.
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Early evolution of cytochrome bc complexes.

机译：细胞色素BC复合物的早期进化。

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摘要

Primary structures, functional characteristics and phylogenetic relationships of subunits of cytochrome bc complexes from phylogenetically diverse bacterial and archaeal species were analysed. A single case of lateral gene transfer, i.e. the import of an epsilon-proteobacterial cytochrome bc(1) complex into Aquificales, was identified. For the enzyme in the remainder of the species studied, the obtained phylogenies were globally in line with small subunit rRNA trees. The distribution of a few key phylogenetic markers, such as contiguousness of cytochrome b, nature of the c-type subunit or spacing between b-heme ligands, are discussed. A localised modification of previous tree topologies is proposed on the basis of the obtained data. The comparison of extant enzymes furthermore allowed us to define the minimal functional and evolutionary core of the enzyme. The data furthermore suggest that the ancestral enzyme was put together from subunits that previously had played a role in other electron transfer chains. Copyright 2000 Academic Press.
机译：分析了系统发育多样的细菌和古细菌物种的细胞色素bc复合体的亚基的一级结构，功能特征和系统发育关系。确定了一个横向基因转移的单一案例，即将ε-蛋白细菌细胞色素bc（1）复合体导入Aquificales。对于其余物种的酶，获得的系统发育总体上与小亚基rRNA树一致。讨论了一些关键的系统发育标记的分布，例如细胞色素b的连续性，c型亚基的性质或b-血红素配体之间的间隔。基于获得的数据，提出了对先前树形拓扑的局部修改。现有酶的比较还使我们能够定义酶的最小功能和进化核心。数据进一步表明，祖先酶是由以前在其他电子转移链中起作用的亚基组成的。版权所有2000学术出版社。

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