Cited by 46Mitochondrial Function and PathologyGenetic Neurodegenerative DiseasesMetabolism and Genetic Disorders

Maturation of Frataxin Within Mammalian and Yeast Mitochondria: One-Step Processing by Matrix Processing Peptidase

Gordon, D. M., Shi, Q., Dancis, A., Pain, D.·1999·Human Molecular Genetics

Abstract

Friedreich's ataxia is a neurodegenerative disease caused by mutations in the nuclear gene encoding frataxin (FRDA). FRDA is synthesized with an N-terminal signal sequence, which is removed after import into mitochondria. We have shown that FRDA was imported efficiently into isolated mammalian or yeast mitochondria. In both cases, the processing cleavage that removed the N-terminal signal sequence occurred in a single step on import, generating mature products of identical mobility. The processing cleavage could be reconstituted by incubating the FRDA preprotein with rat or yeast matrix processing peptidase (MPP) expressed in Escherichia coli. We used these assays to evaluate the import and processing of an altered form of FRDA containing the disease-causing I154F mutation. No effects on import or maturation of this mutated FRDA were observed. Likewise, no effects were observed on import and maturation of the yeast frataxin homolog (Yfh1p) carrying a homologous I130F mutation. These results argue against the possibility that the I154F mutation interferes with FRDA function via effects on maturation. Other mutations can be screened for effects on FRDA biogenesis as described here, by evaluating import into isolated mitochondria and by testing maturation with purified MPP.

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Authors
Gordon, D. M., Shi, Q., Dancis, A., & Pain, D.
Affiliations
University of Pennsylvania (US)
Venue
Human Molecular Genetics
Published
1999-11-01
Volume
8
Issue
12
Pages
2255-2262
ISSN
  • 0964-6906 (ISSN-L)
  • 1460-2083
OpenAlex
W2109962929
Cited by
46
References
38
Citations by year
2024: 2 · 2023: 2 · 2020: 1 · 2017: 2 · 2016: 2 · 2014: 3 · 2013: 1
FWCI
1.84
Type
journal article
Language
en
Open access
closed
Locations
  • Human Molecular Genetics (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • American Heart Association
  • National Institutes of Health
  • National Heart, Lung, and Blood Institute (HL 07027-24)
  • National Institute of General Medical Sciences (GM57067, R01GM057067)
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK 53953)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Genetic Neurodegenerative Diseases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Clinical Biochemistry › Metabolism and Genetic Disorders
Keywords
frataxin, Friedreich's ataxia, mitochondrial protein import, mitochondrial biogenesis, pathogenic variants
MeSH terms
Mitochondrial Processing Peptidase, Frataxin, Animals, Base Sequence, Biological Transport, Friedreich Ataxia, Metalloendopeptidases, Mitochondria, Protein Processing, Post-Translational, Recombinant Proteins, Saccharomyces cerevisiae, Phosphotransferases (Alcohol Group Acceptor), DNA Primers, Iron-Binding Proteins, Rats

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