Functional significance may underlie the taxonomic utility of single amino acid substitutions in conserved proteins.
Functional significance may underlie the taxonomic utility of single amino acid substitutions in conserved proteins.
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DOI:
10.1007/s00239-010-9338-y
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发表时间:
2010-04
影响因子:
3.9
通讯作者:
Huber, Katharina T.
中科院分区:
文献类型:
--
作者:
Tyler, Kevin M.;Wagner, Gerd K.;Wu, Qiong;Huber, Katharina T.
We hypothesized that some amino acid substitutions in conserved proteins that are strongly fixed by critical functional roles would show lineage-specific distributions. As an example of an archetypal conserved eukaryotic protein we considered the active site of β-tubulin. Our analysis identified one amino acid substitution—β-tubulin F224—which was highly lineage specific. Investigation of β-tubulin for other phylogenetically restricted amino acids identified several with apparent specificity for well-defined phylogenetic groups. Intriguingly, none showed specificity for “supergroups” other than the unikonts. To understand why, we analysed the β-tubulin Neighbor-Net and demonstrated a fundamental division between core β-tubulins (plant-like) and divergent β-tubulins (animal and fungal). F224 was almost completely restricted to the core β-tubulins, while divergent β-tubulins possessed Y224. Thus, our specific example offers insight into the restrictions associated with the co-evolution of β-tubulin during the radiation of eukaryotes, underlining a fundamental dichotomy between F-type, core β-tubulins and Y-type, divergent β-tubulins. More broadly our study provides proof of principle for the taxonomic utility of critical amino acids in the active sites of conserved proteins. The online version of this article (doi:10.1007/s00239-010-9338-y) contains supplementary material, which is available to authorized users.
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