ArticleProceedings of the National Academy of Sciences of the United States of America2002
Complementary advantageous substitutions in the evolution of an antiviral RNase of higher primates.
Article in Proceedings of the National Academy of Sciences of the United States of America, 2002. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 40 papers.
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40 citing papers in PubMed, 96 citations in OpenAlex.
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- The use of orthologous sequences to predict the impact of amino acid substitutions on protein function.PLoS genetics · 2010Article
- Greedy selection of species for ancestral state reconstruction on phylogenies: elimination is better than insertion.PloS one · 2010Article
- Evolutionary triplet models of structured RNA.PLoS computational biology · 2009Article
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Abstract
An improved understanding of the evolution of gene function at the molecular level may provide significant insights into the origin of biological novelty and adaptation. With the approach of ancestral protein reconstruction, we here address the question of how a dramatically enhanced ribonucleolytic activity and the related antiviral activity evolved in a recently duplicated ribonuclease (eosinophil-derived neurotoxin) gene of higher primates. We show that the mother gene of the duplicated genes had already possessed a weak antiviral activity before duplication. After duplication, substitutions at two interacting sites (Arg-64-->Ser and Thr-132-->Arg) resulted in a 13-fold enhancement of the ribonucleolytic activity of eosinophil-derived neurotoxin. These substitutions are also necessary for the potent antiviral activity, with contributions from additional amino acid changes at interacting sites. Our observation that a change in eosinophil-derived neurotoxin function occurs only when both interacting sites are altered indicates the importance of complementary substitutions in protein evolution. Thus, neutral substitutions are not simply "noises" in protein evolution, as many have thought. They may play constructive roles by setting the intramolecular microenvironment for further complementary advantageous substitutions, which can lead to improved or altered function. Overall, our study illustrates the power of the "paleomolecular biochemistry" approach in delineating the complex interplays of amino acid substitutions in evolution and in identifying the molecular basis of biological innovation.
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