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Determination of the transmembrane proton gradient in the anaerobic bacterium Desulfovibrio desulfuricans by 31P nuclear magnetic resonance

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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

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