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Investigations on microbial sulfur respiration

1. Activation and reduction of elemental sulfur in several strains of eubacteria

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Abstract

The reduction of elemental or sulfane sulfur to hydrogen sulfide by eubacteria was investigated. Spirillum 5175 had the most active sulfur oxidoreductase. It could be cultivated with fumarate (F), elemental sulfur (S) or nitrate (N) as electron acceptor. Maximum activity was found for Spirillum 5175S but activity was also present in Spirillum 5175F and Spirillum 5175N, i.e. the sulfur oxidoreductase is a constitutive enzyme. It was localized in the membrane, and no activity was found in the cytoplasm in contrast to Desulfovibrio baculatus. Different procedures were applied for the measurement of the sulfur oxidoreductase activity. In the manometric assay hydrogenase was coupled to the sulfur oxidoreductase, and the uptake of dihydrogen was measured in the presence of elemental sulfur. Alternatively, H2S was assayed directly or was trapped in 12% NaOH and determined by the methylene blue procedure. Using 35S sulfur and 35S-labelled compounds both the substrate and H2S could be measured. A further increase in sensitivity was achieved using phenosafranin. It was reduced photochemically, and served as the electron donor to the sulfur oxidoreductase, i.e. no hydrogenase was required. This was an important result in view of the fact that not all sulfur-reducing bacteria contain hydrogenase. However, in those cases the hydrogenase isolated from Clostridium pasteurianum could be coupled to the sulfur oxidoreductase. Among the different forms of elemental sulfur Janek sulfur gave the best results in terms of activity and reproducibility. The reduction of elemental sulfur to hydrogen sulfide had a pH optimum at pH 8.7–8.9. There was always a lag-phase which was pH-dependent. During this period the turbidity of the solution changed. Addition of thiols, such as GSH, shortened the lag-phase and caused an increase in activity of the sulfur oxidoreductase. In the presence of p-chloromercuribenzenesulfonic acid the reaction rate decreased significantly. Comparable reaction rates and activity values of the sulfur oxidoreductase in Spirillum 5175F were obtained with organic trisulfides, RS-S-SR. In contrast to elemental sulfur RS-S-SR are well-defined chemical compounds suitable for quantitative and mechanistic investigations. Labelling the central sulfur of RS-S-SR with 35S gave a satisfactory recovery of the total radioactivity in form of (35S) H2S in our assay. Trisulfides were shown to be formed as reactive intermediates in bacteria. This process required the sulfur transferase rhodanese which was present in Spirillum 5175, or other sulfur-reducing eubacteria.

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Abbreviations

EPR:

Electron Paramagnetic Resonance

A:

Absorbance

PCMS:

p-chloromercuribenzenesulfonic acid

Sp. 5175F :

Splrillum 5175 grown with fumarate

Sp. 5175S :

with sulfur

Sp. 5175N :

with nitrate

SCE:

Standard Calomel Electrode

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Author notes

  1. M. C. Kennedy & H. Beinert

    Present address: Department of Biochemistry, Medical College of Wisconsin, 8701 Watertown Plank Road, 53226, Milwaukee, WI, USA

Authors and Affiliations

  1. Fakultät für Biologie, Universität Konstanz, D-7750, Konstanz, Federal Republic of Germany

    A. Zöphel, M. C. Kennedy, H. Beinert & P. M. H. Kroneck

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  3. H. Beinert
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  4. P. M. H. Kroneck
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Zöphel, A., Kennedy, M.C., Beinert, H. et al. Investigations on microbial sulfur respiration. Arch. Microbiol. 150, 72–77 (1988). https://doi.org/10.1007/BF00409720

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