期刊
BIOSYSTEMS
卷 87, 期 1, 页码 13-19出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biosystems.2006.02.011
关键词
phylogenetic analysis; protein concatenamers; deep divergences; hyperthermophilic ancestor of Bacteria; LUCA; origin of life
In order to establish whether the first lines of divergence in the Bacteria domain were the mesophilic or the hyperthermophilic organisms, we have performed a phylogenetic analysis on a concatenamer obtained from the fusion of 20 different proteins. The phylogenetic analysis carried out using five different methods has shown that, contrary to what is reported in the literature [Brochier, C., Philippe, H., 2002. A non-hyperthermophilic ancestor for Bacteria. Nature 417, 244], it was probably the hyperthermophilic organisms, the Thermotogales and the Aquiticales, which were the first lines of divergence in the Bacteria domain, and not the mesophilic Planctomycetales. This strengthens the hypothesis that the last universal common ancestor might have been a hyperthermophilic 'organism' and that, more generally, life might have originated at high temperature. (c) 2006 Elsevier Ireland Ltd. All rights reserved.
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