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Mobilization of insoluble copper salts and minerals by methanobactin

¹ Chemistry, University of Wisconsin-Eau Claire, Phillips Hall, Eau Claire, WI, 54702,
² Biochemistry, I, 205 Science I, Iowa State University, Ames, IA, 50011

ABSTRACT

Methanobactin (mb) is a chalkophore produced by Methylosinus trichosporium OB3b. It binds Cu(II) ions at a 1:1 stoichiometry very strongly (K_d> 10–30 M) and many other ions with varying stoichiometries and affinities. It is produced in abundance under copper limiting conditions, and contributes to the activity of membrane-bound methane monooxygenase. Since M. trichosporium is widely distributed in the environment and is used in bioremediation of hydrocarbons, it was of interest to see if mb could contribute to mobilization of potentially toxic metals in the environment. In experiments using atomic absorption, UV/visible spectroscopy, and inductively coupled plasma mass spectrometry (ICP-MS) analysis, we find that mb can lead to a net extraction of Cu(II) from insoluble Cu(II)-containing substances including Cu(II)oxide and Cu(II)-containing minerals such as tetrahedrite and malachite.

This Article Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Google Scholar Articles by Zook, J. Articles by Dispirito, A. PubMed Articles by Zook, J. Articles by Dispirito, A.