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Journal of Bacteriology, June 2003, p. 3668-3671, Vol. 185, No. 12
0021-9193/03/$08.00+0     DOI: 10.1128/JB.185.12.3668-3671.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Involvement of Cyclic AMP (cAMP) and cAMP Receptor Protein in Anaerobic Respiration of Shewanella oneidensis

Daad A. Saffarini,* Ryan Schultz, and Alex Beliaev{dagger}

Department of Biological Sciences, University of Wisconsin—Milwaukee, Milwaukee, Wisconsin 53211

Received 18 September 2002/ Accepted 26 March 2003

Shewanella oneidensis is a metal reducer that can use several terminal electron acceptors for anaerobic respiration, including fumarate, nitrate, dimethyl sulfoxide (DMSO), trimethylamine N-oxide (TMAO), nitrite, and insoluble iron and manganese oxides. Two S. oneidensis mutants, SR-558 and SR-559, with Tn5 insertions in crp, were isolated and analyzed. Both mutants were deficient in Fe(III) and Mn(IV) reduction. They were also deficient in anaerobic growth with, and reduction of, nitrate, fumarate, and DMSO. Although nitrite reductase activity was not affected by the crp mutation, the mutants failed to grow with nitrite as a terminal electron acceptor. This growth deficiency may be due to the observed loss of cytochromes c in the mutants. In contrast, TMAO reduction and growth were not affected by loss of cyclic AMP (cAMP) receptor protein (CRP). Fumarate and Fe(III) reductase activities were induced in rich medium by the addition of cAMP to aerobically growing wild-type S. oneidensis. These results indicate that CRP and cAMP play a role in the regulation of anaerobic respiration, in addition to their known roles in catabolite repression and carbon source utilization in other bacteria.

* Corresponding author. Mailing address: University of Wisconsin—Milwaukee, Department of Biological Sciences, 3209 N. Maryland Ave., Milwaukee, WI 53211. Phone: (414) 229-2964. Fax: (414) 229-3926. E-mail: daads{at}uwm.edu.

{dagger} Present address: Pacific Northwest National Laboratories, Richland, WA 99352

Journal of Bacteriology, June 2003, p. 3668-3671, Vol. 185, No. 12
0021-9193/03/$08.00+0     DOI: 10.1128/JB.185.12.3668-3671.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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