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Appl Environ Microbiol. 1989 May; 55(5): 1262-1266
Copyright © 1989, American Society for Microbiology. All Rights Reserved.

Temperature Compensation in Methanosarcina barkeri by Modulation of Hydrogen and Acetate Affinity

Peter Westermann{dagger}, Birgitte K. Ahring{ddagger},* and Robert A. Mah

Environmental and Occupational Health Sciences, School of Public Health, University of California, Los Angeles, California 90024

ABSTRACT

The affinity of Methanosarcina barkeri 227 for acetate and hydrogen at different incubation temperatures was investigated. Increasing the temperature from 20 to 37°C resulted in a 4.5-fold increase in Km for acetate and a 4.8-fold increase for hydrogen. The corresponding increase in Vmax for acetate was 8.3-fold (5.4-fold for hydrogen). This response implied a decrease in the temperature coefficient (Q10) and hence a decrease in the temperature dependency as a function of decreasing substrate concentration.

FOOTNOTES

* Corresponding author.

{dagger} Present address: Department of General Microbiology, University of Copenhagen, Sølvgade 83H, 1307 Copenhagen K, Denmark.

{ddagger} Present address: Institute of Biotechnology, The Technical University of Denmark, Block 223, 2800 Lyngby, Denmark.

Appl Environ Microbiol. 1989 May; 55(5): 1262-1266
Copyright © 1989, American Society for Microbiology. All Rights Reserved.



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