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Appl Environ Microbiol. 1981 October; 42(4): 629-631

Inorganic Sulfur Oxidation by Aureobasidium pullulans

¹ Department of Microbiology, University of Sheffield, Sheffield, S10 2TN, United Kingdom

ABSTRACT

Aureobasidium pullulans (de Bary) Arnaud isolated from the phylloplane of sycamore exposed to heavy atmospheric pollution oxidized S⁰ to S₂O₃^2–, S₄O₆^2–, and SO₄^2– in vitro. The intermediates S₂O₃^2– and S₄O₆^2– were also oxidized to SO₄^2–. Cell-free extracts of A. pullulans also oxidized reduced forms of S, the oxidation increasing linearly with increasing protein concentration, showing that the process is enzymatic. The possible role of fungi in S oxidation in soils is discussed.