Abstract
Manganese(II)-oxidizing bacteria play an integral role in the cycling of Mn as well as other metals and organics. Prior work with Mn(II)-oxidizing bacteria suggested that Mn(II) oxidation involves a multicopper oxidase, but whether this enzyme directly catalyzes Mn(II) oxidation is unknown. For a clearer understanding of Mn(II) oxidation, we have undertaken biochemical studies in the model marine α-proteobacterium, Erythrobacter sp. strain SD21. The optimum pH for Mn(II)-oxidizing activity was 8.0 with a specific activity of 2.5 nmol × min−1 × mg−1 and a K m = 204 μM. The activity was soluble suggesting a cytoplasmic or periplasmic protein. Mn(III) was an intermediate in the oxidation of Mn(II) and likely the primary product of enzymatic oxidation. The activity was stimulated by pyrroloquinoline quinone (PQQ), NAD+, and calcium but not by copper. In addition, PQQ rescued Pseudomonas putida MnB1 non Mn(II)-oxidizing mutants with insertions in the anthranilate synthase gene. The substrate and product of anthranilate synthase are intermediates in various quinone biosyntheses. Partially purified Mn(II) oxidase was enriched in quinones and had a UV/VIS absorption spectrum similar to a known quinone requiring enzyme but not to multicopper oxidases. These studies suggest that quinones may play an integral role in bacterial Mn(II) oxidation.
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Acknowledgments
We thank Cassandra Gaston, Patrizia Pretto, James McCarthy, and Greg Dick for laboratory assistance and helpful discussions. We thank Hans Duine for generously supplying soluble glucose dehydrogenase apoenzyme. We thank the Gordon and Betty Moore Foundation and The Venter Institute for Genome Sequencing of Erythrobacter sp. SD21. This research was funded by grants from the National Science Foundation (CHE-0089208 and MCB-0630355) and a Superfund Basic Research Program Grant to UCSD (NIEHS ES10337).
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Communicated by Friedrich Widdel.
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Johnson, H.A., Tebo, B.M. In vitro studies indicate a quinone is involved in bacterial Mn(II) oxidation. Arch Microbiol 189, 59–69 (2008). https://doi.org/10.1007/s00203-007-0293-y
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DOI: https://doi.org/10.1007/s00203-007-0293-y