Abstract
TOL plasmid pWW0 of Pseudomonas putida encodes a set of enzymes responsible for the degradation of toluene. The structural genes for these catobolic enzymes are clustered into two operons—namely, the xylCMAB and xylXYZLTEGFJQKIH operons. We examined the codon usage patterns of these catabolic genes by measuring the codon-usage distances between pairs of these catabolic genes. The codon-usage distance, d, between gene 1 and gene 2 was defined as d = [ε(p j − q j )2]1/2, where p j > and q j are the frequencies of the j-th codon in gene 1 and 2, respectively, j being any one of the 64 possible codons. We found that the genes in the same operon exhibit similar codon-usage patterns while genes in the different operons exhibit different codon bias. This observation suggests that genes in the same operon have coevolved, and that the ancestors of the xylCMAB and xylXYZLTEGFJQKIH operons evolved in different organisms.
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Harayama, S. Codon usage patterns suggest independent evolution of two catabolic operons on toluene-degradative plasmid TOL pWW0 of Pseudomonas putida . J Mol Evol 38, 328–335 (1994). https://doi.org/10.1007/BF00163150
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DOI: https://doi.org/10.1007/BF00163150