Localization of the Wilson's disease protein product to mitochondria

Svetlana Lutsenko, Matthew J. Cooper

Research output: Contribution to journalArticlepeer-review

Abstract

Wilson's disease (WND) is an inherited disorder of copper homeostasis characterized by abnormal accumulation of copper in several tissues, particularly in the liver, brain, and kidney. The disease-associated gene encodes a copper-transporting P-type ATPase, the WND protein, the subcellular location of which could be regulated by copper. We demonstrate that the WND protein is present in cells in two forms, the 160-kDa and the 140-kDa products. The 160-kDa product was earlier shown to be targeted to trans- Golgi network. The 140-kDa product identified herein is located in mitochondria as evidenced by the immunofluorescent staining of HepG2 cells with specific mitochondria markers and polyclonal antibody directed against the C terminus of the WND molecule. The mitochondrial location for the 140- kDa WND product was confirmed by membrane fractionation and by analysis of purified human mitochondria. The antibody raised against a repetitive sequence in the N-terminal portion of the WND molecule detects an additional 16-kDa protein, suggesting that the 140-kDa product was formed after proteolytic cleavage of the full-length WND protein at the N terminus. Thus, the WND protein is a P-type ATPase with an unusual subcellular localization. The mitochondria targeting of the WND protein suggests its important role for copper-dependent processes taking place in this organelle.

Original languageEnglish (US)
Pages (from-to)6004-6009
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume95
Issue number11
DOIs
StatePublished - May 26 1998
Externally publishedYes

Keywords

  • Copper
  • Subcellular localization

ASJC Scopus subject areas

  • General

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