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Next Article 

Applied and Environmental Microbiology, October 1998, p. 3549-3555, Vol. 64, No. 10
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

c-Type Cytochromes and Manganese Oxidation in Pseudomonas putida MnB1

Ron Caspi,dagger Bradley M. Tebo,* and M. G. Haygood

Scripps Institution of Oceanography, University of California in San Diego, La Jolla, California 92093-0202

Received 23 April 1998/Accepted 12 July 1998

Pseudomonas putida MnB1 is an isolate from an Mn oxide-encrusted pipeline that can oxidize Mn(II) to Mn oxides. We used transposon mutagenesis to construct mutants of strain MnB1 that are unable to oxidize manganese, and we characterized some of these mutants. The mutants were divided into three groups: mutants defective in the biogenesis of c-type cytochromes, mutants defective in genes that encode key enzymes of the tricarboxylic acid cycle, and mutants defective in the biosynthesis of tryptophan. The mutants in the first two groups were cytochrome c oxidase negative and did not contain c-type cytochromes. Mn(II) oxidation capability could be recovered in a c-type cytochrome biogenesis-defective mutant by complementation of the mutation.

* Corresponding author. E-mail: btebo{at}ucsd.edu.

dagger Present address: Department of Biology, University of California in San Diego, La Jolla, CA 92093-0634.

Applied and Environmental Microbiology, October 1998, p. 3549-3555, Vol. 64, No. 10
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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