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Trends in amino acid usage across the class Mollicutes.
MedLine Citation:
PMID:  23297862     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Many studies have explored the mechanisms involved in relative amino acid usage (RAAU) in a variety of prokaryotes and eukaryotes. A strong bias was observed in highly expressed genes (HEGs) of endosymbiotic bacteria. By means of correspondence analysis, we studied the major trends affecting internal variability of RAAU in Mollicutes. The principal trend is related to the usage of smaller, less aromatic, and GC-rich coded amino acids in HEGs. Given the nature of the genetic code, these properties are linked among them. Expectedly, we found a slow evolutionary rate of HEGs, which is likely driven by purifying selection. On the other hand, the rest of the genes accumulate rapid changes as a result of the extreme mutational bias toward A + T of the genomes and genetic drift, increasing internal variability. Amino acid changes across the phylogeny of the group were traced in order to estimate the mean molecular weight and aromaticity trends in each branch. Finally, we compared amino acid usage bias within and between Mollicutes and the free-living Firmicutes.
Authors:
Andrés Iriarte; Juan Diego Baraibar; Leticia Diana; Susana Castro-Sowinski; Héctor Romero; Héctor Musto
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-9
Journal Detail:
Title:  Journal of biomolecular structure & dynamics     Volume:  -     ISSN:  1538-0254     ISO Abbreviation:  J. Biomol. Struct. Dyn.     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-9     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8404176     Medline TA:  J Biomol Struct Dyn     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
a Laboratorio de Organización y Evolución del Genoma, Facultad de Ciencias , UDELAR. Iguá 4225 , Montevideo , 11400 , Uruguay.
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