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Published online ahead of print on 21 April 2009 as doi:10.1099/mic.0.024141-0
Microbiology 2009;155:1989.

Microbiology (2009), DOI 10.1099/mic.0.024141-0
© 2009 Society for General Microbiology
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Microbiology 0 (2009), mic.0.024141; DOI  10.1099/mic.0.024141-0
© 2009 Society for General Microbiology

Removal of multi-heavy metals using biogenic manganese oxides generated by a deep-sea sedimentary bacterium - Brachybacterium sp. Mn32

Wenming Wang1, Zongze Shao2, Yanjun Liu1 and Gejiao Wang1,3

1 State Key Laboratory of Agricultural Microbiology;
2 The Third Institute of Oceanography

ABSTRACT

A deep-sea manganese-oxidizing bacterium, Brachybacterium sp. Mn32, showed high Mn(II) resistance (MIC = 55 mM) and Mn(II) oxidizing / removing abilities. Mn32 removed Mn(II) by two pathways: 1) oxidizing soluble Mn(II) to insoluble biogenic Mn oxides - birnessite ({delta}-MnO2 group) and manganite ({gamma}-MnOOH); 2) the biogenic Mn oxides further adsorb more Mn(II) from the culture. The generated biogenic Mn oxides surround the cell surfaces of Mn32 and provide a big ability to adsorb Zn(II) and Ni(II). Mn(II) oxidation by Mn32 was inhibited by both sodium azide and o-phenanthroline suggesting the involvement of a metalloenzyme which was induced by Mn(II). X-ray diffraction analysis showed the crystal structures of the biogenic Mn oxides were different from the commercial pyrolusite (β-MnO2 group) and the fresh chemical synthetic vernadite ({delta}-MnO2 group). The biogenic Mn oxides generated by Mn32 showed 2-3 times higher Zn(II) and Ni(II) adsorption abilities than the commercial and fresh synthetic MnO2. The crystal structure and the biogenic MnO2 types might be the important factors for the high heavy metal adsorption ability of Mn32. This study provides potential applications of a new marine Mn(II)-oxidizing bacterium in heavy metal bioremediation and increases our basic knowledge of the manganese oxidation mechanisms.

3 E-mail: gejiao{at}mail.hzau.edu.cn






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