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J Biol Chem, Vol. 274, Issue 40, 28497-28504, October 1, 1999

Characterization of the Interaction between the Wilson and Menkes Disease Proteins and the Cytoplasmic Copper Chaperone, HAH1p

Dmitri LarinDagger , Constantinos Mekios§, Kamna DasDagger , Barbara RossDagger , An-Suei YangDagger , and T. Conrad GilliamDagger §

From the Dagger  Columbia Genome Center and the § Departments of Psychiatry and Genetics and Development, College of Physicians and Surgeons, Columbia University, New York, New York 10032

Wilson disease (WD) and Menkes disease (MNK) are inherited disorders of copper metabolism. The genes that mutate to give rise to these disorders encode highly homologous copper transporting ATPases. We use yeast and mammalian two-hybrid systems, along with an in vitro assay to demonstrate a specific, copper-dependent interaction between the six metal-binding domains of the WD and MNK ATPases and the cytoplasmic copper chaperone HAH1. We demonstrate that several metal-binding domains interact independently or in combination with HAH1p, although notably domains five and six of WDp do not. Alteration of either the Met or Thr residue of the HAH1p MTCXXC motif has no observable effect on the copper-dependent interaction, whereas alteration of either of the two Cys residues abolishes the interaction. Mutation of any one of the HAH1p C-terminal Lys residues (Lys56, Lys57, or Lys60) to Gly does not affect the interaction, although deletion of the 15 C-terminal residues abolishes the interaction. We show that apo-HAH1p can bind in vitro to copper-loaded WDp, suggesting reversibility of copper transfer from HAH1p to WD/MNKp. The in vitro HAH1/WDp interaction is metalospecific; HAH1 preincubated with Cu2+ or Hg+ but not with Zn2+, Cd2+, Co2+, Ni3+, Fe3+, or Cr3+ interacted with WDp. Finally, we model the protein-protein interaction and present a theoretical representation of the HAH1p·Cu·WD/MNKp complex.

Copyright © 1999 by The American Society for Biochemistry and Molecular Biology, Inc.
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