Evolution of Bcl-2 homology motifs: homology versus homoplasy.
Evolution of Bcl-2 homology motifs: homology versus homoplasy.
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DOI:
10.1016/j.tcb.2012.10.010
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发表时间:
2013-03
影响因子:
19
通讯作者:
Hardwick JM
中科院分区:
文献类型:
--
作者:
Aouacheria A;Rech de Laval V;Combet C;Hardwick JM
Bcl-2 family proteins regulate apoptosis in animals. This protein family includes several homologous proteins and a collection of other proteins lacking sequence similarity except for a Bcl-2 homology (BH)3 motif. Thus, membership in the Bcl-2 family requires only one of the four BH motifs. On this basis, a growing number of diverse BH3-only proteins are being reported. Although compelling cell biological and biophysical evidence validates many BH3-only proteins, claims of significant BH3 sequence similarity are often unfounded. Computational and phylogenetic analyses suggest that only some BH3 motifs arose by divergent evolution from a common ancestor (homology), whereas others arose by convergent evolution or random coincidence (homoplasy), challenging current assumptions about which proteins constitute the extended Bcl-2 family.
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