Maturation of Frataxin Within Mammalian and Yeast Mitochondria: One-Step Processing by Matrix Processing Peptidase
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
- Publisher
- Oxford University Press (OUP)
- 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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