Abstract
We previously identified two oxidases in the membranes of bacterium Bacillus sp. FTU. One of them slowly ( caa 3) and the other rapidly ( bo) recombines with carbon monoxide (CO) after laser flash photolysis, in this respect resembling the Escherichia coli bo- and bd-type oxidases, respectively. In the present study we found three copper atoms in the slowly CO-recombining oxidase from Bacillus sp. FTU. In the other oxidase, the copper content is very low and clearly substoichiometric. Reversed-phase chromatography revealed the presence of haems A and C in the Bacillus sp. FTU copper-containing oxidase and haems B and C in the non-copper-containing one. We thus suggest that the Bacillus sp. FTU oxidase rapidly reacting with CO previously attributed to bo-type by analogy in redox spectrum with the E. coli enzyme be redefined as bb-type oxidase.
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