The physiology and habitat of the last universal common ancestor
The physiology and habitat of the last universal common ancestor
复制标题
最后一个普遍共同祖先的生理和栖息地
DOI:
10.1038/nmicrobiol.2016.116
复制
发表时间:
--
影响因子:
28.3
通讯作者:
William F. Martin
中科院分区:
文献类型:
--
作者:
Madeline C. Weiss;Filipa L. Sousa;Natalia Mrnjavac;Sinje Neukirchen;Mayo Roettger;Shijulal Nelson-Sathi;William F. Martin
The concept of a last universal common ancestor of all cells (LUCA, or the progenote) is central to the study of early evolution and life's origin, yet information about how and where LUCA lived is lacking. We investigated all clusters and phylogenetic trees for 6.1 million protein coding genes from sequenced prokaryotic genomes in order to reconstruct the microbial ecology of LUCA. Among 286,514 protein clusters, we identified 355 protein families (∼ 0.1%) that trace to LUCA by phylogenetic criteria. Because these proteins are not universally distributed, they can shed light on LUCA's physiology. Their functions, properties and prosthetic groups depict LUCA as anaerobic, CO 2-fixing, H 2-dependent with a Wood–Ljungdahl pathway, N 2-fixing and thermophilic. LUCA's biochemistry was replete with FeS clusters and radical reaction mechanisms. Its cofactors reveal dependence upon transition metals, flavins, S-adenosyl methionine, coenzyme A, ferredoxin, molybdopterin, corrins and selenium. Its genetic code required nucleoside modifications and S-adenosyl methionine-dependent methylations. The 355 phylogenies identify clostridia and methanogens, whose modern lifestyles resemble that of LUCA, as basal among their respective domains. LUCA inhabited a geochemically active environment rich in H 2, CO 2 and iron. The data support the theory of an autotrophic origin of life involving the Wood–Ljungdahl pathway in a hydrothermal setting.
登录
查看更多内容
影响因子:
4.5
作者:
E. Shock;E. Shock;E. Boyd;E. Boyd
通讯作者:
E. Boyd
影响因子:
10.7
作者:
Katoh K;Standley DM
通讯作者:
Standley DM
影响因子:
--
作者:
Shigeyuki Yokoyama;Kimitsuna Watanabe;Tatsuo Miyazawa
通讯作者:
Tatsuo Miyazawa
影响因子:
56.9
作者:
Evans, Paul N.;Parks, Donovan H.;Tyson, Gene W.
通讯作者:
Tyson, Gene W.
DOI:
--
发表时间:
2008
期刊:
--
影响因子:
--
作者:
P. Blum
通讯作者:
P. Blum