Effects of inhibitors and NaCl on the oxidation of reduced inorganic sulfur compounds by a marine acidophilic, sulfur-oxidizing bacterium, Acidithiobacillus thiooxidans strain SH

Extremophiles : Life Under Extreme Conditions
Kazuo KamimuraTsuyoshi Sugio

Abstract

The effect of NaCl and the pathways of the oxidation of reduced inorganic sulfur compounds were studied using resting cells and cell-free extracts of Acidithiobacillus thiooxidans strain SH. This isolate specifically requires NaCl for growth. The oxidation of sulfur and sulfite by resting cells was strongly inhibited by 2-heptyl-4-hydroxyquinoline-N-oxide. Carbonylcyanide m-chlorophenyl-hydrazone and monensin were also relatively strong inhibitors. Thiosulfate-oxidizing activity was not inhibited by these uncouplers. Valinomycin did not inhibit the oxidation of sulfur compounds. NaCl stimulated the sulfur- and sulfite-oxidizing activities in resting cells but not in cell-free extracts. The tetrathionate-oxidizing activity in resting cells was slightly stimulated by NaCl, whereas it did not influence the thiosulfate-oxidizing activity. Sulfide oxidation was biphasic, suggesting the formation of intermediate sulfur. The initial phase of sulfide oxidation was not affected by NaCl, whereas the subsequent oxidation of sulfur in the second phase was Na+-dependent. A model is proposed for the role of NaCl in the metabolism of reduced sulfur compounds in A. thiooxidans strain SH.

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Mar 29, 2003·Extremophiles : Life Under Extreme Conditions·Kazuo KamimuraTsuyoshi Sugio
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Citations

Nov 30, 2011·Applied Microbiology and Biotechnology·Carla M ZammitElizabeth L J Watkin
Sep 24, 2014·Advances in Colloid and Interface Science·Mengxue DiaoAnh V Nguyen
Apr 19, 2012·Environmental Microbiology·Mark Dopson, D Barrie Johnson
Feb 26, 2013·Biotechnology and Bioengineering·Roberto A Bobadilla FazziniPilar Parada
Mar 4, 2010·Biotechnology and Bioengineering·Chandra Sekhar GahanAke Sandström
May 26, 2020·World Journal of Microbiology & Biotechnology·Paola Gissel Duarte BriceñoMarco Antonio Márquez Godoy

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