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. 1985 Dec;164(3):1294–1300. doi: 10.1128/jb.164.3.1294-1300.1985

Calcium transport in membrane vesicles of Bacillus subtilis.

W de Vrij, R Bulthuis, E Postma, W N Konings
PMCID: PMC219329  PMID: 3934142

Abstract

Right-side-out membrane vesicles of Bacillus subtilis W23 grown on tryptone-citrate medium accumulated Ca2+ under aerobic conditions in the presence of a suitable electron donor. Ca2+ uptake was an electrogenic process which was completely inhibited by carbonyl cyanide m-chlorophenylhydrazone or valinomycin and not by nigericin. This electrogenic uptake of calcium was strongly dependent on the presence of phosphate and magnesium ions. The system had a low affinity for Ca2+. The kinetic constants in membrane vesicles were Km = 310 microM Ca2+ and Vmax = 16 nmol/mg of protein per min. B. subtilis also possesses a Ca2+ extrusion system. Right-side-out-oriented membrane vesicles accumulated Ca2+ upon the artificial imposition of a pH-gradient, inside acid. This system had a high affinity for Ca2+; Km = 17 microM Ca2+ and Vmax = 3.3 nmol/mg of protein per min. Also, a membrane potential, inside positive, drove Ca2+ transport via this Ca2+ extrusion system. Evidence for a Ca2+ extrusion system was also supplied by studies of inside-out-oriented membrane vesicles in which Ca2+ uptake was energized by respiratory chain-linked oxidation of NADH or ascorbate-phenazine methosulfate. Both components of the proton motive force, the pH gradient and the membrane potential, drove Ca2+ transport via the Ca2+ extrusion system, indicating a proton-calcium antiport system with a H+ to Ca2+ stoichiometry larger than 2. The kinetic parameters of this Ca2+ extrusion system in inside-out-oriented membranes were Km = 25 microM and Vmax = 0.7 nmol/mg of protein per min.

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Selected References

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