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Two different isozymes (Iso A and Iso B) of catechol1,2 dioxygenase (C1,2O) were isolated from cultures of A. radioresistens grownin two different media, containing phenol and benzoate respectively. In thephenol medium the bacteria expressed about 90% of Iso A, whereas in thebenzoate medium the Iso A/Iso B ratio was 40:60. The two proteins havedifferent molecular masses, isoelectric points and Nterminal sequences that arenot consistent with simple posttranslational modifications. Furthermore, theirbehaviour differs at high temperatures (42 C47 C) and at moderately acidic pH(pH 6.0): Iso A proved to be the more stable under conditions of environmentalstress. Hybridisation analysis with an A. calcoaceticus catAderived proberevealed that A. radioresistens C1,2O proteins are encoded by two chromosomallylocated genes. Bidimensional electrophoresis (2DE) maps of crude extracts ofcells grown in different carbon sources (phenol, benzoate and acetate) clearlydemonstrated a differential induction pattern for the two proteins. Thehypothesis of a double set of genes, one for benzoate catabolism and the otherfor phenol catabolism, is discussed, and analogies are drawn with other knownC1,2Os.

The Catechol 1,2 Dioxygenase System of Acinetobacter radioresistens: Isoenzymes, Inductors and Gene Localisation