Isotope effects associated with the anaerobic oxidation of sulfite and thiosulfate by the photosynthetic bacterium, Chromatium vinosum

FEMS Microbiology Letters
B FryJ M Hayes


The purple photosynthetic bacterium Chromatium vinosum, strain D, catalyzes several oxidations of reduced sulfur compounds under anaerobic conditions in the light: e.g., sulfide --> sulfur --> sulfate, sulfite --> sulfate, and thiosulfate --> sulfur + sulfate. Here it is shown that no sulfur isotope effect is associated with the last of these processes; isotopic compositions of the sulfur and sulfate produced can differ, however, if the sulfane and sulfonate positions within the thiosulfate have different isotopic compositions. In the second process, an observed change from an inverse to a normal isotope effect during oxidation of sulfite may indicate the operation of 2 enzymatic pathways. In contrast to heterotrophic anaerobic reduction of oxidized sulfur compounds, anaerobic oxidations of inorganic sulfur compounds by photosynthetic bacteria are characterized by relatively small isotope effects.


Feb 11, 2012·Isotopes in Environmental and Health Studies·Alexander V SurkovJan Kuever
May 21, 2013·Applied and Environmental Microbiology·Masrure AlamWriddhiman Ghosh
Sep 7, 2001·Geochimica Et Cosmochimica Acta·K S Habicht, D E Canfield
Jan 17, 2014·Environmental Microbiology·Elizabeth G WilbanksVictoria J Orphan
Mar 15, 2019·Nature Communications·Lena PetersAndre C Stiel
Sep 2, 2017·Frontiers in Microbiology·Nurgul BalciAlexandra V Turchyn

Related Concepts

Chemical Fractionation
Sulfates, Inorganic
Sulfur Isotopes
Water Microbiology

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