Induction of the Escherichia coli cytochrome d by low delta mu H+ and by sodium ionsстатья

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[1] Induction of the escherichia coli cytochrome d by low delta mu h+ and by sodium ions / A. V. Bogachev, R. A. Murtazine, A. I. Shestopalov, V. P. Skulachev // European journal of biochemistry / FEBS. — 1995. — Vol. 232, no. 1. — P. 304–308. Regulation of synthesis of cytochrome d in Escherichia coli has been studied using mutants with cytochrome-d–beta-galactosidase gene fusions. It was shown that various protonophorous uncouplers, when added to the growth medium, cause induction of the cytochrome d synthesis. The cytochrome-d-inducing activity of uncouplers correlates with their ability to inhibit such a delta mu (H+)-driven function as motility of the E. coli cells. An increase in the Na+ concentration in the growth medium from 1.5 mM to 25 mM results in induction of the cytochrome d synthesis. The cytochrome-d-inducing effect of uncouplers is much more pronounced when the Na+ concentration is high than when it is low. These data are in agreement with the assumption that cytochrome d is involved in the Na+ energetics substituting for the H+ energetics when the latter appears to be inefficient. Mutations in arcA or arcB genes (but not in fnr gene) completely prevent the increase in the cytochrome d level induced by uncouplers but are without effect on that induced by Na+. It is assumed that in the control of the cytochrome d synthesis, the Arc system is involved in the delta mu H+ sensing whereas sensing of delta mu Na+ (or of the Na+ concentration) is mediated by some other receptor system. [ DOI ]

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