Mzm1 influences a labile pool of mitochondrial zinc important for respiratory function

Aaron Atkinson, Oleh Khalimonchuk, Pamela Smith, Hana Sabic, David Eide, Dennis R. Winge

Research output: Contribution to journalArticlepeer-review

41 Scopus citations


Zinc is essential for function of mitochondria as a cofactor for several matrix zinc metalloproteins. We demonstrate that a labile cationic zinc component of low molecular mass exists in the yeast mitochondrial matrix. This zinc pool is homeostatically regulated in response to the cellular zinc status. This pool of zinc is functionally important because matrix targeting of a cytosolic zinc-binding protein reduces the level of labile zinc and interferes with mitochondrial respiratory function. We identified a series of proteins that modulate the matrix zinc pool, one of which is a novel conserved mitochondrial protein designated Mzm1. Mutant mzm1Δ cells have reduced total and labile mitochondrial zinc, and these cells are hypersensitive to perturbations of the labile pool. In addition, mzm1Δ cells have a destabilized cytochrome c reductase (Complex III) without any effects on Complexes IV or V. Thus, we have established that a link exists between Complex III integrity and the labile mitochondrial zinc pool.

Original languageEnglish (US)
Pages (from-to)19450-19459
Number of pages10
JournalJournal of Biological Chemistry
Issue number25
StatePublished - Jun 18 2010
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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