Uptake of sulfate, sulfite and thiosulfate by proton-anion symport in Desulfovibrio desulfuricans (original) (raw)
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Abstract
pH changes and sulfide production upon addition of sulfate, sulfite or thiosulfate to non-buffered H2-saturated cell suspensions of Desulfovibrio desulfuricans were studied by means of electrodes. The addition of these electron acceptors resulted in a rapid alkalinization of the suspension which was accompanied by sulfide production. At-2° C, alkalinization without immediate sulfide production could be obtained. After addition of 35S-labelled sulfate at-2° C, the label was found to be concentrated 7,500-fold in the cells, while 2 protons per sulfate molecule had disappeared from the outer bulk phase. Alkalinization and sulfide production from micromolar electron acceptor additions depended on the transmembraneous proton gradient (Δ pH), and were reversibly inhibited in alkaline solution (pH>8.0) or by the protonophore carbonylcyanide m-chlorophenylhydrazone (CCCP). Protonophore-inhibited sulfide production from sulfite or thiosulfate could be restored if the cell membranes were permeabilized by the detergent cetyltrimethylammonium bromide (CTAB), or if downhill transport was made possible by the addition of electron acceptors at millimolar concentrations. Sulfate was not reduced under these conditions, presumably because the cells did not contain ATP for its activation. K+-and Na+-ionophores such as nigericin, valinomycin or monensin appeared to be of limited efficiency in D. desulfuricans. In most experiments, sulfate reduction was inhibited by the K+−H+ antiporter nigericin in the presence of K+, but not by the thiocyanate anion or the K+-transporter valinomycin. The results indicate that sulfate, sulfite and thiosulfate are taken up by proton-anion symport, presumably as undissociated acids with an electroneutral mechanism, driven by the transmembraneous pH gradient (Δ pH) or by a solute gradient. Kinetics of alkalinization and sulfide production in cells grown with different electron acceptors revealed that D. desulfuricans has different specific uptake systems for sulfate and thiosulfate, and obviously also for sulfite. It is proposed that the electron acceptor transport finally will not consume net energy during growth in buffered medium: The protons taken up during active electron acceptor transport leave the cell with the reduced end-product by simple passive diffusion of H2S.
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Abbreviations
CCCP:
carbonyl cyanide m-chlorophenylhydrazone
FCCP:
carbonyl cyanide p-trifluoromethoxy phenylhydrazone
CTAB:
cethyltrimethylammonium bromide
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Authors and Affiliations
- Fakultät für Biologie, Universität Konstanz, D-7750, Konstanz, Federal Republic of Germany
H. Cypionka
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- H. Cypionka
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Cypionka, H. Uptake of sulfate, sulfite and thiosulfate by proton-anion symport in Desulfovibrio desulfuricans.Arch. Microbiol. 148, 144–149 (1987). https://doi.org/10.1007/BF00425363
- Received: 24 February 1987
- Accepted: 06 May 1987
- Issue Date: July 1987
- DOI: https://doi.org/10.1007/BF00425363