Cited by 118Genetic Neurodegenerative DiseasesMitochondrial Function and PathologyHereditary Neurological Disorders

In vivo maturation of human frataxin

Condò, Ivano, Ventura, Natascia, Malisan, Florence, Rufini, Alessandra, Tomassini, Barbara, Testi, Roberto·2007·Human Molecular Genetics

Abstract

The defective expression of frataxin causes the hereditary neurodegenerative disorder Friedreich's ataxia (FRDA). Human frataxin is synthesized as a 210 amino acid precursor protein, which needs proteolytic processing into mitochondria to be converted into the functional mature form. In vitro processing of human frataxin was previously described to yield a 155 amino acid mature form, corresponding to residues 56-210 (frataxin(56-210)). Here, we studied the maturation of frataxin by in vivo overexpression in human cells. Our data show that the main form of mature frataxin is generated by a proteolytic cleavage between Lys80 and Ser81, yielding a 130 amino acid protein (frataxin(81-210)). This maturation product corresponds to the endogenous frataxin detected in human heart, peripheral blood lymphocytes or dermal fibroblasts. Moreover, we demonstrate that frataxin(81-210) is biologically functional, as it rescues aconitase defects in frataxin-deficient cells derived from FRDA patients. Importantly, our data indicate that frataxin(56-210) can be produced in vivo when the primary 80-81 maturation site is unavailable, suggesting the existence of proteolytic mechanisms that can actively control the size of the mature product, with possible functional implications.

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Crossref · 10.1093/hmg/ddm102

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Authors
Condò, I., Ventura, N., Malisan, F., Rufini, A., Tomassini, B., & Testi, R.
Affiliations
University of Rome Tor Vergata (IT)
Corresponding author
Testi, Roberto
Venue
Human Molecular Genetics
Published
2007-04-27
Volume
16
Issue
13
Pages
1534-1540
ISSN
  • 0964-6906 (ISSN-L)
  • 1460-2083
OpenAlex
W2120039680
Cited by
118
References
39
Citations by year
2026: 2 · 2025: 2 · 2024: 3 · 2023: 6 · 2022: 7 · 2021: 3 · 2020: 7 · 2019: 9 · 2018: 9 · 2017: 5 · 2016: 4 · 2015: 5 · 2014: 8 · 2013: 9 · 2012: 7
FWCI
2.79
Type
journal article
Language
en
Open access
closed
Locations
  • Human Molecular Genetics (publishedVersion)
  • PubMed (publishedVersion)
  • Cineca Institutional Research Information System (Tor Vergata University) (submittedVersion)
Funders
  • Friedreich's Ataxia Research Alliance
  • National Ataxia Foundation
  • Ataxia UK
  • European Commission
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Genetic Neurodegenerative Diseases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Hereditary Neurological Disorders
Keywords
frataxin, Friedreich's ataxia, protein maturation, proteolytic processing, mitochondrial targeting, aconitase, protein isoforms
MeSH terms
Frataxin, Aconitate Hydratase, Amino Acid Sequence, Cell Line, Cells, Cultured, Fibroblasts, Friedreich Ataxia, Gene Expression Regulation, Homozygote, Humans, Lymphocytes, Models, Biological, Molecular Sequence Data, Mutation, Gene Deletion, Iron-Binding Proteins

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