Iron requirement for Mn(II) oxidation by Leptothrix discophora SS-1.

ABSTRACT: A common form of biocatalysis of Mn(II) oxidation results in the formation of biogenic Mn(III, IV) oxides and is a key reaction in the geochemical cycling of Mn. In this study, we grew the model Mn(II)-oxidizing bacterium Leptothrix discophora SS-1 in media with limited iron (0.1 microM iron/5.8 mM pyruvate) and sufficient iron (0.2 microM iron/5.8 mM pyruvate). The influence of iron on the rate of extracellular Mn(II) oxidation was evaluated. Cultures in which cell growth was limited by iron exhibited reduced abilities to oxidize Mn(II) compared to cultures in medium with sufficient iron. While the extracellular Mn(II)-oxidizing factor (MOF) is thought to be a putative multicopper oxidase, Mn(II) oxidation in the presence of zero added Cu(II) was detected and the decrease in the observed

SUBMITTER: El Gheriany IA 

PROVIDER: S-EPMC2648177 | biostudies-literature | 2009 Mar

REPOSITORIES: biostudies-literature