Abstract
The transmembrane proton gradient of the sulfate-reducing bacterium Desulfovibrio desulfuricans strain CSN has been determined by in vivo31P nuclear magnetic resonance (NMR) spectroscopy in the absence of dioxygen. At pH 7.0 in the medium (pHex) the intracellular pH (pHin) was 7.5. By lowering pHex to 5.9 pHin decreased to 7.1. At pHex greater than 7.7 the transmembrane proton gradient (ΔpH) was zero. The uncouplers 3,3′,4′,5-tetrachlorosalicylanilide (TCS) and carbonylcyanide-m-chlorophenylhydrazone (CCCP), or the permeant anion thiocyanate caused complete dissipation of ΔpH.
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Abbreviations
- CCCP :
-
carbonylcyanide-m-chlorophenylhydrazone
- TCS :
-
3,3′,4′,5-tetrachlorosalicylanilide
- MOPS :
-
3-(N-morpholino)-propanesulfonic acid
- P i :
-
inorganic phosphate
- pH in (pHex):
-
intracellular (extracellular) pH
- ΔpH :
-
transmembrane proton gradient (pHin-pHex)
- ΔΨ:
-
electrochemical membrane potential
- δ:
-
chemical shift in parts per million
- NMR :
-
nuclear magnetic resonance
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Kroder, M., Kroneck, P.M.H. & Cypionka, H. Determination of the transmembrane proton gradient in the anaerobic bacterium Desulfovibrio desulfuricans by 31P nuclear magnetic resonance. Arch. Microbiol. 156, 145–147 (1991). https://doi.org/10.1007/BF00290988
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DOI: https://doi.org/10.1007/BF00290988