LONP1 - dismech genes

Normal function · from ai-gene-review (P36776, commit 79fe13b38970) · AI-generated, not KB evidence

LONP1 is the nuclear-encoded mitochondrial Lon protease, synthesized as a precursor and processed after import into the mitochondrial matrix. The canonical protein assembles into a homo-oligomeric ring-shaped AAA+ machine whose ATPase cycle recognizes, unfolds, and translocates selected misfolded, unassembled, oxidatively damaged, or short-lived proteins into a serine protease chamber for degradation. LONP1 also has a separable, protease-independent ATP-dependent chaperone activity that assists folding and suppresses aggregation of newly imported matrix and inner-membrane proteins, thereby supporting mitochondrial proteostasis and organization. Binding to single-stranded mitochondrial DNA and RNA is a genuine secondary property, but its physiological regulatory consequences remain incompletely defined. Isoforms 2 and 3 delete N-terminal sequence that overlaps or removes the canonical targeting region, so their mitochondrial localization and ability to execute the matrix protease and chaperone functions are not established.

Homo-oligomeric LONP1 couples ATP-driven substrate recognition, unfolding, and translocation to serine-type endopeptidase activity, selectively degrading damaged, misfolded, unassembled, and regulatory proteins in the mitochondrial matrix. This is the principal mitochondrial protein-quality control and protein-catabolic activity of the canonical protein.

molecular function: ATP-dependent peptidase activity · directly involved in: mitochondrial protein catabolic process; protein quality control for misfolded or incompletely synthesized proteins; oxidation-dependent protein catabolic process · locations: mitochondrial matrix

LONP1 uses its AAA+ ATPase cycle as a protease-independent protein-folding chaperone, maintaining client solubility and cooperating with the mtHSP70 system during biogenesis of newly imported mitochondrial proteins. This activity is mechanistically separable from peptide-bond hydrolysis and does not imply that LONP1, mtHSP70, and their partners form one stable obligate heteromeric complex.

molecular function: ATP-dependent protein folding chaperone · directly involved in: 'de novo' protein folding · locations: mitochondrial matrix

In the knowledge base · computed from kb/ at build time

Disorders

Relationship is the entry's genetic[].relationship_type. untyped means the entry has a genetic record for the gene but does not type it; its free-text association is shown instead.

Disorder	Relationship	Where the gene appears
Congenital Diaphragmatic Hernia	risk factor
Pyruvate Dehydrogenase Deficiency	causative germline	mechanism: LONP1 impaired phospho-E1-alpha proteolysis subtype: E1-alpha deficiency scoped to subtype: E1-alpha deficiency
CODAS Syndrome	untyped Biallelic variants with substrate-dependent residual function	mechanism: LONP1 Protease Dysfunction

ClinGen gene–disease validity · snapshot 2026-10-03 · matched to entries by MONDO

An entry matches when ClinGen's MONDO disease is the entry's own disease term, a subtype term, or an exact-match mapping. An amber status marks an entry ClinGen supports the gene for (Definitive, Strong or Moderate) whose own record does not type it. A Limited, Disputed or Refuted tier on such an entry is not a gap.

ClinGen disease	MOI	Classification	dismech entry
Leigh syndrome MONDO:0009723	AR	Limited 2021-04-09	Leber-like Hereditary Optic Neuropathy, Autosomal Recessive 1 not named Leigh Syndrome not named