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New insights into the codon usage patterns of the bactericidal/permeability-increasing (BPI) gene across nine species.
Gene 2017 June 16
Bactericidal/permeability-increasing (BPI) protein is a member of a new generation of proteins known as super-antibiotics that are implicated as endotoxin neutralising agents. Non-uniform usage of synonymous codons for a specific amino acid during translation of a protein is known as codon usage bias (CUB). Analysis of CUB and compositional dynamics of coding sequences could contribute to a better understanding of the molecular mechanism and the evolution of a particular gene. In this study, we performed CUB analysis of the complete coding sequences of the BPI gene from nine different species. The codon usage patterns of BPI across different species were found to be influenced by GC bias, particularly GC3s, with a moderate bias in the codon usage of BPI. We found significant similarities in the codon usage patterns in BPI gene among closely related species, such as Sus_scrofa and Bos_taurus. Moreover, we observed evolutionary conservation of the most over-represented codon CUG for the amino acid leucine in the BPI gene across all species. In conclusion, our analysis provides a novel insight into the codon usage patterns of BPI. This information facilitates an improved understanding of the structural, functional and evolutionary significance of BPI gene among species, and provides a theoretical reference for developing antiseptic drug proteins with high efficiency across species.
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