Requirement for terminal cytochromes in generation of the aerobic signal for the arc regulatory system in Escherichia coli: study utilizing deletions and lac fusions of cyo and cyd.

Abstract excerpt

Escherichia coli has two terminal oxidases for its respiratory chain: cytochrome o (low O2 affinity) and cytochrome d (high O2 affinity). Expression of the cyo operon, encoding cytochrome o, is decreased by anaerobic growth, whereas expression of the cyd operon, encoding cytochrome d, is increased by anaerobic growth. We show by the use of lac gene fusion that the expressions of cyo and cyd are under the control...

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