Expression of the Ciona intestinalis Alternative Oxidase (AOX) in Drosophila Complements Defects in Mitochondrial Oxidative Phosphorylation

Daniel J M Fernandez-Ayala, Alberto Sanz, Suvi Vartiainen, Kia K. Kemppainen, Marek Babusiak, Eero Mustalahti, Rodolfo Costa, Tea Tuomela, Massimo Zeviani, Jongkyeong Chung, Kevin M C O'Dell, Pierre Rustin, Howard T. Jacobs

Research output: Contribution to journalArticlepeer-review

Abstract

Defects in mitochondrial OXPHOS are associated with diverse and mostly intractable human disorders. The single-subunit alternative oxidase (AOX) found in many eukaryotes, but not in arthropods or vertebrates, offers a potential bypass of the OXPHOS cytochrome chain under conditions of pathological OXPHOS inhibition. We have engineered Ciona intestinalis AOX for conditional expression in Drosophila melanogaster. Ubiquitous AOX expression produced no detrimental phenotype in wild-type flies. However, mitochondrial suspensions from AOX-expressing flies exhibited a significant cyanide-resistant substrate oxidation, and the flies were partially resistant to both cyanide and antimycin. AOX expression was able to complement the semilethality of partial knockdown of both cyclope (COXVIc) and the complex IV assembly factor Surf1. It also rescued the locomotor defect and excess mitochondrial ROS production of flies mutated in dj-1β, a Drosophila homolog of the human Parkinson's disease gene DJ1. AOX appears to offer promise as a wide-spectrum therapeutic tool in OXPHOS disorders.

Original languageEnglish
Pages (from-to)449-460
Number of pages12
JournalCell Metabolism
Volume9
Issue number5
DOIs
Publication statusPublished - May 6 2009

Keywords

  • HUMDISEASE

ASJC Scopus subject areas

  • Cell Biology
  • Molecular Biology
  • Physiology

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