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Applied and Environmental Microbiology, November 2004, p. 6940-6943, Vol. 70, No. 11
0099-2240/04/$08.00+0     DOI: 10.1128/AEM.70.11.6940-6943.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

SHORT REPORT

Acetate Threshold Concentrations Suggest Varying Energy Requirements during Anaerobic Respiration by Anaeromyxobacter dehalogenans

Qiang He{dagger}, and Robert A. Sanford*

Department of Civil and Environmental Engineering, University of Illinois at Urbana/Champaign, Urbana, Illinois

Received 21 April 2004/ Accepted 13 July 2004

ABSTRACT

Acetate threshold concentrations were determined under chlororespiring and Fe(III)-reducing conditions for Anaeromyxobacter dehalogenans strain 2CP-C. The acetate threshold concentrations measured were 69 ± 4, 19 ± 8, and <1 nM for chlororespiration, amorphous Fe(III) reduction, and Fe(III) citrate reduction, respectively. Residual {Delta}G values of –75.4 kJ/mol of electrons for chlororespiration and –41.5 kJ/mol of electrons for amorphous Fe(III) reduction were calculated at the acetate threshold concentration. By comparing threshold concentrations for different metabolisms in a single organism, this study provides insight into the metabolic use of energy under different growth conditions.

* Corresponding author. Mailing address: Department of Geology, University of Illinois at Urbana/Champaign, 245 Natural History Bldg., 1301 W. Green St., Urbana, IL 61801-2352. Phone: (217) 244-7250. Fax: (217) 333-6968. E-mail: rsanford{at}uiuc.edu.

FOOTNOTES

{dagger} Present address: Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831.

Applied and Environmental Microbiology, November 2004, p. 6940-6943, Vol. 70, No. 11
0099-2240/04/$08.00+0     DOI: 10.1128/AEM.70.11.6940-6943.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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