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Article
Nature Structural Biology  5, 47 - 54 (1998)
doi:10.1038/nsb0198-47

Solution structure of the fourth metal-binding domain from the Menkes copper-transporting ATPase

Jane Gitschier1, Barbara Moffat2, Dorothea Reilly3, William I. Wood4 & Wayne J. Fairbrother5

  1Howard Hughes Medical Institute and Departments of Medicine and Pediatrics, University of California, San Francisco, California 94143, USA.

  2Department of Protein Chemistry, Genentech, Inc., South San Francisco, California 90480, USA.

  3Department of Cell Culture, Genentech, Inc., South San Francisco, California 90480, USA.

  4Department of Molecular Biology, Genentech, Inc., South San Francisco, California 90480, USA.

  5Department of Protein Engineering, Genentech, Inc., South San Francisco, California 90480, USA. e-mail: fairbro@gene.com

Menkes disease is an X-linked disorder in copper transport that results in death during early childhood. The solution structures of both apo and Ag(l)-bound forms of the fourth metal-binding domain (mbd4) from the Menkes copper-transporting ATPase have been solved. The 72-residue mbd4 has a ferredoxin-like betaalphabetabetaalphabeta fold. Structural differences between the two forms are limited to the metal-binding loop, which is disordered in the apo structure but well ordered in the Ag(l)-bound structure. Ag(l) binds in a linear bicoordinate manner to the two Cys residues of the conserved GMTCxxC motif; Cu(l) likely coordinates in a similar manner. Menkes mbd4 is thus the first bicoordinate copper-binding protein to be characterized structurally. Sequence comparisons with other heavy-metal-binding domains reveal a conserved hydrophobic core and metal-binding motif.

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Nature Structural & Molecular Biology
ISSN: 1545-9993
EISSN: 1545-9985
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