Abstract
The thermostability of the respiratory chain of Bacillus coagulans grown at different temperatures was similar to the thermotolerance of the primary dehydrogenases. NADH was the major electron donor to the respiratory chain in cells grown at both 37 °C and 55 °C. The respiratory chain from cells grown at 55 °C exhibited slightly greater thermostability than that from cells grown at 37 °C. NADH-supported respiration, as well as NADH dehydrogenase activity, was much more thermotolerant than that with succinate in cells grown at both temperatures. Membrane-bound succinate dehydrogenase could be stabilized by the addition of 10% (w/v) NaCl while NADH dehydrogenase exhibited intrinsic thermostability.
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