The effect of temperature on sulfur and oxygen isotope fractionation by sulfate reducing bacteria (Desulfococcus multivorans). Issue 9 (8th April 2020)

• Record Type: Journal Article
• Authors: Pellerin, André; Antler, Gilad; Marietou, Angeliki; Turchyn, Alexandra V; Jørgensen, Bo Barker
• Is Part Of: FEMS microbiology letters. Volume 367:Issue 9(2020)
• Publication Date: 2020-04-08
• Subjects: sulfur isotope -- sulfate reduction -- oxygen isotope -- temperature; sulfate reducing pathway -- isotope -- equilibrium; Microbiology -- Periodicals; 579
• DOI: 10.1093/femsle/fnaa061
• Languages: English
• ISSNs: 0378-1097

Abstract

ABSTRACT: Temperature influences microbiological growth and catabolic rates. Between 15 and 35 °C the growth rate and cell specific sulfate reduction rate of the sulfate reducing bacterium Desulfococcus multivorans increased with temperature. Sulfur isotope fractionation during sulfate reduction decreased with increasing temperature from 27.2 ‰ at 15 °C to 18.8 ‰ at 35 °C which is consistent with a decreasing reversibility of the metabolic pathway as the catabolic rate increases. Oxygen isotope fractionation, in contrast, decreased between 15 and 25 °C and then increased again between 25 and 35 °C, suggesting increasing reversibility in the first steps of the sulfate reducing pathway at higher temperatures. This points to a decoupling in the reversibility of sulfate reduction between the steps from the uptake of sulfate into the cell to the formation of sulfite, relative to the whole pathway from sulfate to sulfide. This observation is consistent with observations of increasing sulfur isotope fractionation when sulfate reducing bacteria are living near their upper temperature limit. The oxygen isotope decoupling may be a first signal of changing physiology as the bacteria cope with higher temperatures. Abstract : Changing bacterial physiology as temperature increases leads to a decoupling of reversibility in the different steps of the sulfate reducing pathway.