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FXN

Function

Promotes the biosynthesis of heme and assembly and repair of iron-sulfur clusters by delivering Fe(2+) to proteins involved in these pathways. May play a role in the protection against iron-catalyzed oxidative stress through its ability to catalyze the oxidation of Fe(2+) to Fe(3+); the oligomeric form but not the monomeric form has in vitro ferroxidase activity. May be able to store large amounts of iron in the form of a ferrihydrite mineral by oligomerization; however, the physiological relevance is unsure as reports are conflicting and the function has only been shown using heterologous overexpression systems. Modulates the RNA-binding activity of ACO1.

Involvement in disease

Friedreich ataxia

FRDA

Autosomal recessive, progressive degenerative disease characterized by neurodegeneration and cardiomyopathy it is the most common inherited ataxia. The disorder is usually manifest before adolescence and is generally characterized by incoordination of limb movements, dysarthria, nystagmus, diminished or absent tendon reflexes, Babinski sign, impairment of position and vibratory senses, scoliosis, pes cavus, and hammer toe. In most patients, FRDA is due to GAA triplet repeat expansions in the first intron of the frataxin gene. But in some cases the disease is due to mutations in the coding region.

None

The disease is caused by variants affecting the gene represented in this entry.

Post-translational modifications

Processed in two steps by mitochondrial processing peptidase (MPP). MPP first cleaves the precursor to intermediate form and subsequently converts the intermediate to yield frataxin mature form (frataxin(81-210)) which is the predominant form. The additional forms, frataxin(56-210) and frataxin(78-210), seem to be produced when the normal maturation process is impaired; their physiological relevance is unsure.

Sequence similarities

Belongs to the frataxin family.

Tissue specificity

Expressed in the heart, peripheral blood lymphocytes and dermal fibroblasts.

Cellular localization

  • Mitochondrion
  • Cytoplasm
  • Cytosol
  • PubMed:18725397 reports localization exclusively in mitochondria.

Alternative names

  • Friedreich ataxia protein
  • Fxn
  • FXN
  • FRDA
  • X25

Target type

Proteins

Primary research area

Neuroscience

Other research areas

  • Epigenetics

Molecular weight

23135Da