Optimality of codon usage in Escherichia coli due to load minimization.
The canonical genetic code is known to be highly efficient in minimizing the effects of mistranslational errors and point mutations, an ability which in term is designated "load minimization". One parameter involved in calculating the load minimizing property of the genetic code is codon usage. In most bacteria, synonymous codons are not used with equal frequencies. Different factors have been proposed to contribute to codon usage preference. It has been shown that the codon preference is correlated with the composition of the tRNA pool. Selection for translational efficiency and translational accuracy both result in such a correlation. In this work, it is shown that codon usage bias in Escherichia coli works so as to minimize the consequences of translational errors, i.e. optimized for load minimization.
Najafabadi
Hamed Shateri
HS
Department of Biotechnology, Faculty of Science, University of Tehran, Enghelab Ave., Tehran, Iran. shateri@khayam.ut.ac.ir
Goodarzi
Hani
H
Torabi
Noorossadat
N
D003062:Codon; D019295:Computational Biology; D004926:Escherichia coli / Q000235:genetics*; D019143:Evolution, Molecular; D015964:Gene Expression Regulation, Bacterial; D005798:Genes, Bacterial; D005815:Genetic Code; D040741:Genetic Load; D008957:Models, Genetic; D017354:Point Mutation; D012343:RNA, Transfer
D003062:Codon; D012343:RNA, Transfer