Surfeit locus protein 1 (SURF1)

Surfeit locus protein 1 (SURF1) is a multi-pass inner mitochondrial membrane protein crucial for the assembly of cytochrome c oxidase (complex IV) in the mitochondrial respiratory chain. SURF1 acts as an assembly factor, ensuring the proper assembly, biogenesis, and stability of complex IV, enabling efficient oxidative phosphorylation and cellular energy production. Mutations in SURF1 cause mitochondrial complex IV deficiency, most commonly manifesting as Leigh syndrome (a severe early-onset neurodegenerative disorder) or Charcot-Marie-Tooth disease type 4K (a demyelinating neuropathy). SURF1 is encoded on chromosome 9 and is a member of the surfeit gene cluster. More than 80 disease-associated mutations have been identified, typically resulting in loss of SURF1 function and subsequent reduction or absence of cytochrome c oxidase activity, especially in brain and muscle. Patients with SURF1 deficiency typically present with progressive neurological deterioration, muscle weakness, and other multisystem findings from mitochondrial energy deficiency. There are currently no approved drugs that directly interact with or modulate SURF1. Diagnosis relies on genetic testing for SURF1 mutations and biochemical evidence of complex IV deficiency.

Other names

SURF1 cytochrome c oxidase assembly factorSURF-1SHY1 (yeast ortholog)Surfeit 1MC4DN1CMT4K (Charcot-Marie-Tooth disease type 4K-associated gene)surfeit locus protein 1

Not applicable; no approved drugs target SURF1 directly. Disease association is via genetic loss-of-function rather than pharmacologic inhibition or modulation