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Journal of Bacteriology, April 2006, p. 3138-3142, Vol. 188, No. 8
0021-9193/06/$08.00+0     doi:10.1128/JB.188.8.3138-3142.2006
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

Two Putative c-Type Multiheme Cytochromes Required for the Expression of OmcB, an Outer Membrane Protein Essential for Optimal Fe(III) Reduction in Geobacter sulfurreducens

Byoung-Chan Kim,* Xinlei Qian, Ching Leang, Maddalena V. Coppi, and Derek R. Lovley

Department of Microbiology, University of Massachusetts, Amherst, Massachusetts 01003

Received 20 October 2005/ Accepted 25 January 2006

Deletion of two homologous Geobacter sulfurreducens c-type cytochrome genes, omcG and omcH, decreased the rate of Fe(III) reduction and decreased the level of an outer membrane cytochrome critical for Fe(III) reduction, OmcB, without affecting its transcription. Expression of either gene restored Fe(III) reduction and OmcB expression, suggesting functional similarity.

* Corresponding author. Mailing address: Department of Microbiology, 203 Morrill Science Center IVN, University of Massachusetts at Amherst, 639 North Pleasant St., Amherst, MA 01003. Phone: (413) 545-6796. Fax: (413) 545-1578. E-mail: bckim{at}microbio.umass.edu.

Journal of Bacteriology, April 2006, p. 3138-3142, Vol. 188, No. 8
0021-9193/06/$08.00+0     doi:10.1128/JB.188.8.3138-3142.2006
Copyright © 2006, American Society for Microbiology. All Rights Reserved.



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