mitochondrial ribonuclease P complex

GO:0030678 · Other · Other · Proposed

A ribonuclease P complex located in the mitochondrion of a eukaryotic cell, where it catalyzes the 5' endonucleolytic cleavage of precursor tRNAs to yield mature tRNAs. The subunit composition of mitochondrial ribonuclease P complexes varies between species. The complex contains a single RNA molecule and a single protein molecule in yeast (PMID:12045094), but comprises three proteins and lacks an RNA component in humans. [GO:0030678]

Synonyms: mitochondrial RNase P complex

UniProt location names: UniProt Consortium, CC BY 4.0. Reference label and route sources.

Functions

ribonuclease P activity GO:0004526 — The mitochondrial ribonuclease P complex removes 5-prime extra nucleotides from precursor tRNA by endonucleolytic RNA cleavage.
- GO:0004526 GO:0004526 is the Gene Ontology molecular-function term for ribonuclease P activity.
- GO:0030678 GO:0030678 defines mitochondrial RNase P as catalyzing 5-prime endonucleolytic cleavage of precursor tRNAs.
tRNA 5'-leader removal GO:0001682 — Mitochondrial RNase P complexes generate mature tRNA 5-prime ends by cleaving 5-prime leader sequences from pre-tRNAs.
- GO:0001682 GO:0001682 is the Gene Ontology biological-process term for tRNA 5'-leader removal.
- GO:0030678 GO:0030678 defines mitochondrial RNase P as generating mature tRNAs by precursor-tRNA cleavage.

Mechanism graphs

Mitochondrial RNase P processes precursor tRNAs (FUNCTION)

GO defines the mitochondrial ribonuclease P complex as a mitochondrial RNase P complex that catalyzes 5-prime endonucleolytic cleavage of precursor tRNAs.

Subject	Predicate	Object	Evidence
mitochondrial ribonuclease P complex	localizes to	mitochondrion	`GO:0030678` GO:0030678 defines this RNase P complex by its mitochondrial localization. `GO:0098798` GO:0098798 is the cellular-component parent for mitochondrial protein-containing complexes.
mitochondrial ribonuclease P complex	enables	ribonuclease P activity	`GO:0030678` GO:0030678 defines mitochondrial RNase P as catalyzing cleavage of precursor tRNAs. `GO:0004526` GO:0004526 is the molecular-function term for ribonuclease P activity.
precursor tRNA	has 5-prime leader removed by	ribonuclease P activity	`GO:0004526` GO:0004526 defines ribonuclease P activity as endonucleolytic removal of 5-prime extra nucleotides from tRNA precursor.
mitochondrial ribonuclease P complex	supports	tRNA 5'-leader removal	`GO:0030678` GO:0030678 defines mitochondrial RNase P as generating mature tRNAs by precursor-tRNA cleavage. `GO:0001682` GO:0001682 is the biological-process term for tRNA 5'-leader removal.

Discussions

CURATION_TODO (OPEN): Resolve RNA-containing and protein-only mitochondrial RNase P component boundaries. GO:0030678 spans species-variable mitochondrial RNase P complexes, including a yeast RNA-plus-protein form and a human protein-only form. Exact source-neutral RNA and protein constituents should be curated from primary component evidence before assigning components.

Evidence

GO:0030678 Gene Ontology cellular-component term for the mitochondrial ribonuclease P complex and its exact synonym.
GO:0030677 Gene Ontology cellular-component parent term for the ribonuclease P complex.
GO:0098798 Gene Ontology cellular-component parent term for mitochondrial protein-containing complexes.
GO:0005739 Gene Ontology cellular-component term for the mitochondrion.
GO:0004526 Gene Ontology molecular-function term for ribonuclease P activity.
GO:0001682 Gene Ontology biological-process term for tRNA 5'-leader removal.
PMID:12045094 Publication cited in GO:0030678 definition xrefs for mitochondrial RNase P subunit-composition evidence.
PMID:27187488 Publication cited in GO:0030678 definition xrefs for mitochondrial RNase P subunit-composition evidence.

Curation history

2026-09-25T16:27:39Z codex · CREATED_RECORD — Scaffolded by scripts/new_record.py
2026-09-25T16:28:34Z codex · EXPANDED_RECORD — Added GO exact synonymy, RNase P and mitochondrial-complex parentage, GO-backed tRNA 5-prime leader cleavage functions, GO/PubMed evidence, a nonmechanistic function graph and a TODO for species-variable mitochondrial RNase P component boundaries.

Source: data/structures/other/mitochondrial_ribonuclease_p_complex.yaml