cyanelle ribonuclease P complex

GO:0030679 · Ribonucleoprotein · Ribonucleoprotein complex · Proposed

A ribonuclease P complex located in the cyanelle, where it catalyzes the 5' endonucleolytic cleavage of precursor tRNAs to yield mature tRNAs. The best characterized cyanelle ribonuclease P complex, from the alga Cyanophora paradoxa, contains a single RNA molecule that is necessary but not sufficient for catalysis, and several protein molecules. [GO:0030679]

Synonyms: cyanelle RNase P complex

Part of: cyanelle (GO:0009842)

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

Components

Component	Type	Part of / acts on	Grounding	Genes	Stoichiometry	Essential	Role
RNase P RNA	Rna	part of	`SO:0000386`				Single RNA constituent of the Cyanophora paradoxa cyanelle RNase P complex that is necessary but not sufficient for catalysis. `GO:0030679` GO:0030679 defines the best characterized cyanelle RNase P complex as containing a single RNA molecule. `SO:0000386` SO:0000386 is the Sequence Ontology term for RNase_P_RNA.
cyanelle RNase P protein subunits	Protein	part of	Reviewed label only (reviewed name; no accession asserted)				Protein constituents that accompany RNase P RNA in the Cyanophora paradoxa cyanelle RNase P complex. `GO:0030679` GO:0030679 defines the best characterized cyanelle RNase P complex as containing several protein molecules.

Functions

ribonuclease P activity GO:0004526 — The cyanelle 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:0030679 GO:0030679 defines cyanelle RNase P as catalyzing 5-prime endonucleolytic cleavage of precursor tRNAs.
tRNA 5'-leader removal GO:0001682 — Cyanelle 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:0030679 GO:0030679 defines cyanelle RNase P as generating mature tRNAs by precursor-tRNA cleavage.

Mechanism graphs

RNase P RNA and proteins form cyanelle RNase P (ASSEMBLY)

The best characterized cyanelle ribonuclease P complex from Cyanophora paradoxa contains a single RNase P RNA and several protein molecules.

Subject	Predicate	Object	Evidence
RNase P RNA	contributes constituents to	cyanelle ribonuclease P complex	`GO:0030679` GO:0030679 defines the complex as containing a single RNA molecule.
cyanelle RNase P protein subunits	contributes constituents to	cyanelle ribonuclease P complex	`GO:0030679` GO:0030679 defines the complex as containing several protein molecules.
cyanelle ribonuclease P complex	localizes to	cyanelle	`GO:0030679` GO:0030679 defines this RNase P complex by its cyanelle localization. `GO:0009842` GO:0009842 is the cyanelle cellular-component term.

Discussions

CURATION_TODO (OPEN): Resolve exact source-neutral protein-family boundaries for the Cyanophora paradoxa cyanelle RNase P complex. The first GO:0030679 record captures the GO-defined single-RNA, several-protein cyanelle composition at cohort granularity. Exact source-neutral cyanelle RNase P protein families should be resolved before assigning protein groundings.

Evidence

GO:0030679 Gene Ontology cellular-component term for the cyanelle ribonuclease P complex and its exact synonym.
GO:0030681 Gene Ontology cellular-component parent term for multimeric ribonuclease P complexes.
GO:0009842 Gene Ontology cellular-component term for the cyanelle.
SO:0000386 Sequence Ontology term for RNase_P_RNA.
GO:0004526 Gene Ontology molecular-function term for ribonuclease P activity.
GO:0001682 Gene Ontology biological-process term for tRNA 5'-leader removal.

Curation history

2026-09-25T13:27:31Z codex · CREATED_RECORD — Scaffolded by scripts/new_record.py
2026-09-25T13:28:13Z codex · EXPANDED_RECORD — Added cyanelle RNase P parentage and parthood, GO exact synonymy, SO-grounded RNase P RNA plus reviewed-label-only cyanelle RNase P protein components, conservative function terms, an assembly graph and a TODO for exact Cyanophora cyanelle protein-family boundaries.

Source: data/structures/ribonucleoprotein/cyanelle_ribonuclease_p_complex.yaml