Methanobactin, a Copper-Acquisition Compound from Methane-Oxidizing Bacteria (2004)

Author(s): Kim HJ, Graham DW, DiSpirito AA, Alterman MA, Galeva N, Larive CK, Asunskis D, Sherwood PMA

    Abstract: Siderophores are extracellular iron-binding compounds that mediate iron transport into many cells. We present evidence of analogous molecules for copper transport from methane-oxidizing bacteria, represented here by a small fluorescent chromopeptide (C45N12O14H62Cu; 1216 Da) produced by Methylosinus trichosporium OB3b. The crystal structure of this compound, methanobactin, was resolved to 1.15 Å. It is comprised of a tetrapeptide, a tripeptide, and several unique moieties, including two 4-thionyl-5-hydroxy-imidazole chromophores that coordinate the copper, a pyrrolidine that confers a bend in the overall chain, and a N-terminal isopropylester group. The copper coordination environment includes a dual N,S-donating system derived from the thionyl imidazolate moieties. Structural elucidation of this molecule has broad implications in terms of organo-copper chemistry, biological methane oxidation, and global carbon cycling.

    • Type of Article: Report
    • Date: 2004-09-10
    • Journal: Science
    • Volume: 305
    • Issue: 5690
    • Pages: 1612-1615
    • Publisher: American Association for the Advancement of Science
    • Publication type: Article
    • Bibliographic status: Published

    Professor David Graham
    Professor of Ecosystems Engineering