Conservation of protein structure over four billion years.

Conservation of protein structure over four billion years.
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DOI:
10.1016/j.str.2013.06.020
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发表时间:
2013-09-03
期刊:
影响因子:
5.7
通讯作者:
Gavira, Jose A.
Gavira, Jose A.
中科院分区:
生物学2区
文献类型:
--
作者:
Ingles-Prieto, Alvaro;Ibarra-Molero, Beatriz;Delgado-Delgado, Asuncion;Perez-Jimenez, Raul;Fernandez, Julio M.;Gaucher, Eric A.;Sanchez-Ruiz, Jose M.;Gavira, Jose A.

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Little is known with certainty about the evolution of protein structures in general and the degree of protein structure conservation over planetary time scales in particular. Here we report the X-ray crystal structures of seven laboratory resurrections of Precambrian thioredoxins dating back up to ~4 billion years before present. Despite considerable sequence differences compared with extant enzymes, the ancestral proteins display the canonical thioredoxin fold while only small structural changes have occurred over 4 billion years. This remarkable degree of structure conservation since a time near the last common ancestor of life supports a punctuated-equilibrium model of structure evolution in which the generation of new folds occurs over comparatively short periods of time and is followed by long periods of structural stasis.
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