Kelly, Donovan P., 1940-. (2008) Stable sulfur isotope fractionation and discrimination between the sulfur atoms of thiosulfate during oxidation by Halothiobacillus neapolitanus. FEMS Microbiology Letters, Vol.282 (No.2). pp. 299-306. ISSN 0378-1097

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Abstract

Growing cultures and nongrowing suspensions of Halothiobacillus neapolitanus selectively fractionated S-32 and S-34 during the oxidation of the sulfane- and sulfonate-sulfur atoms of thiosulfate. Sulfate was enriched in S-32, with delta S-34 reaching -6.3 parts per thousand relative to the precursor sulfonate-sulfur of thiosulfate, which was progressively resynthesized from the thiosulfate-sulfane-sulfur during thiosulfate metabolism. Polythionates, principally trithionate, accumulated during thiosulfate oxidation and showed progressive increase in the relative S-34 content of their sulfonate groups, with delta S-34 values up to +20 parts per thousand, relative to the substrate sulfur. The origins of the sulfur in the sulfate and polythionate products of oxidation were tracked by the use thiosulfate labelled with S-35 in each of its sulfur atoms, enabling determination of the flow of the sulfur atoms into the oxidation products. The results confirm that highly significant fractionation of stable sulfur isotopes can be catalyzed by thiobacilli oxidizing thiosulfate, but that differences in the S-34/S-32 ratios of the nonequivalent constituent sulfur atoms of the thiosulfate used as substrate mean that the oxidative fate of each atom needs separate determination. The data are very significant to the understanding of bacterial sulfur-compound oxidation and highly relevant to the origins of biogenic sulfate minerals.

Item Type:	Journal Article
Subjects:	Q Science > QR Microbiology
Divisions:	Faculty of Science > Life Sciences (2010- )
Library of Congress Subject Headings (LCSH):	Sulfur -- Isotopes, Sulfur bacteria, Bacillus (Bacteria), Thiosulfates -- Oxidation, Chemoautotrophic bacteria
Journal or Publication Title:	FEMS Microbiology Letters
Publisher:	Wiley-Blackwell Publishing Ltd.
ISSN:	0378-1097
Date:	May 2008
Volume:	Vol.282
Number:	No.2
Number of Pages:	8
Page Range:	pp. 299-306
Identification Number:	10.1111/j.1574-6968.2008.01146.x
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
URI:	http://wrap.warwick.ac.uk/id/eprint/30218

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