Document Detail


Mutational Bias Plays an Important Role in Shaping Longevity-Related Amino Acid Content in Mammalian mtDNA-Encoded Proteins.
MedLine Citation:
PMID:  22752047     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
During the course of evolution, amino acid shifts might have resulted in mitochondrial proteomes better endowed to resist oxidative stress. However, owing to the problem of distinguishing between functional constraints/adaptations in protein sequences and mutation-driven biases in the composition of these sequences, the adaptive value of such amino acid shifts remains under discussion. We have analyzed the coding sequences of mtDNA from 173 mammalian species, dissecting the effect of nucleotide composition on amino acid usages. We found remarkable cysteine avoidance in mtDNA-encoded proteins. However, no effect of longevity on cysteine content could be detected. On the other hand, nucleotide compositional shifts fully accounted for threonine usages. In spite of a strong effect of mutational bias on methionine abundances, our results suggest a role of selection in determining the composition of methionine. Whether this selective effect is linked or not to protection against oxidative stress is still a subject of debate.
Authors:
Juan Carlos Aledo; Héctor Valverde; João Pedro de Magalhães
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-6-30
Journal Detail:
Title:  Journal of molecular evolution     Volume:  -     ISSN:  1432-1432     ISO Abbreviation:  -     Publication Date:  2012 Jun 
Date Detail:
Created Date:  2012-7-3     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0360051     Medline TA:  J Mol Evol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Departamento de Biología Molecular y Bioquímica, Facultad de Ciencias, Universidad de Málaga, 29071, Málaga, Spain, caledo@uma.es.
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