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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Evolutionary divergence of co-selected beta-ketoadipate enol-lactone hydrolases in Acinetobacter calcoaceticus.

Muconolactone isomerase (EC and beta-ketoadipate enol-lactone hydrolase (EC mediate consecutive catabolic steps in bacteria. Separately inducible beta-ketoadipate enol-lactone hydrolases I and II are formed in representatives of Acinetobacter calcoaceticus. When subjected to DEAE-cellulose chromatography, Acinetobacter enol-lactone hydrolase I displays heterogeneous behavior which, in whole or in part, appears to be due to modifications of sulfhydryl groups in the protein; the enzyme is unusual in that its NH2-terminal amino acid is cysteine. Comparison of the NH2-terminal amino acid sequence of Acinetobacter enollactone hydrolase I, reported here, with the corresponding amino acid sequences of Acinetobacter enollactone hydrolase II and Pseudomonas enol-lactone hydrolase indicates that all three proteins have diverged widely from a common evolutionary origin. Sequence comparisons suggest that divergence of the Acinetobacter enol-lactone hydrolase structural genes was achieved by substitution with DNA derived from an ancestral muconolactone isomerase structural gene.[1]


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