mitochondrial crista junction

GO:0044284 · Membrane organelle · Subcellular region · Proposed

A tubular structure of relatively uniform size that connects a mitochondrial crista to the mitochondrial inner boundary membrane. [GO:0044284]

Part of: mitochondrial inner membrane (GO:0005743)

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

Taxonomic distribution

NCBITaxon:2759 Eukaryota — VARIABLE: GO constrains mitochondrial crista junction to Eukaryota; the junction is modeled as a mitochondrial inner-membrane contact site in crista-bearing mitochondria. [GO:0044284]
NCBITaxon:4932 Saccharomyces cerevisiae — COMMON: Budding-yeast mitochondrial inner membranes form crista junctions whose positioning and abundance are regulated by MICOS subcomplexes. [DOI:10.7554/elife.07739]

Canonical examples

NCBITaxon:4932 Saccharomyces cerevisiae — Budding-yeast model used for electron tomography and genetic analysis of MICOS-dependent mitochondrial crista-junction architecture. [DOI:10.7554/elife.07739]

Functions

inner mitochondrial membrane organization GO:0007007 — Crista junctions define neck-like regions of the mitochondrial inner membrane that organize crista folds relative to the inner boundary membrane.
- GO:0044284 GO:0044284 defines the crista junction as the tubular connection between a crista and the mitochondrial inner boundary membrane.
- GO:0007007 GO:0007007 defines inner mitochondrial membrane organization as assembly, arrangement of constituent parts, or disassembly of the mitochondrial inner membrane.

Mechanism graphs

MICOS maintains yeast crista junctions (ASSEMBLY)

In budding yeast, crista junctions connect crista folds to the inner boundary membrane, and MICOS subcomplexes help position and maintain those junctions.

Subject	Predicate	Object	Evidence
mitochondrial crista junction	is part of	mitochondrial inner membrane	`GO:0044284` GO relates GO:0044284 mitochondrial crista junction part_of GO:0005743 mitochondrial inner membrane.
mitochondrial crista junction	connects	mitochondrial crista	`GO:0044284` GO:0044284 defines the crista junction as the tubular structure that connects a mitochondrial crista to the inner boundary membrane.
mitochondrial crista junction	connects	mitochondrial inner boundary membrane	`GO:0044284` GO:0044284 defines the crista junction as the tubular structure that connects a crista to the mitochondrial inner boundary membrane. `GO:0097002` GO:0097002 defines the mitochondrial inner boundary membrane as the portion of the mitochondrial inner membrane not invaginated to form cristae.
MICOS complex	maintains	mitochondrial crista junction	`GO:0061617` GO:0061617 defines the MICOS complex by its role in maintenance of crista junctions and inner-membrane architecture. `DOI:10.7554/elife.07739` Friedman et al. 2015 analyze how budding-yeast MICOS subcomplexes regulate crista-junction positioning and abundance.

Discussions

INTERPRETATION (RESOLVED): Should MICOS be duplicated as a component of the mitochondrial crista junction record? MICOS is curated as associated architecture machinery on the whole mitochondrial crista record. This crista-junction record keeps the junction as a membrane region and uses MICOS only as maintenance machinery in the nonmechanistic graph.

Evidence

GO:0044284 Gene Ontology cellular-component term for mitochondrial crista junction.
GO:0044232 Gene Ontology cellular-component parent term for organelle membrane contact site.
GO:0005743 Gene Ontology cellular-component term for mitochondrial inner membrane.
GO:0030061 Gene Ontology cellular-component term for mitochondrial crista.
GO:0097002 Gene Ontology cellular-component term for mitochondrial inner boundary membrane.
GO:0061617 Gene Ontology cellular-component term for the MICOS complex.
GO:0007007 Gene Ontology biological-process term for inner mitochondrial membrane organization.
DOI:10.7554/elife.07739 Friedman et al. 2015, 'MICOS coordinates with respiratory complexes and lipids to establish mitochondrial inner membrane architecture', eLife.
DOI:10.1038/nature12985 Friedman and Nunnari 2014, 'Mitochondrial form and function', Nature.

Curation history

2026-09-15T22:24:22Z codex · CREATED_RECORD — Scaffolded by scripts/new_record.py
2026-09-15T22:25:31Z codex · EXPANDED_RECORD — Added GO membrane-contact parentage and mitochondrial-inner-membrane parthood, Eukaryota and Saccharomyces scope, cristae-formation evidence, a nonmechanistic crista-junction topology graph, and a resolved MICOS boundary discussion.
2026-09-15T22:37:55Z codex · REVIEW_FIXES — Resolved PR #1033 review issues #1034 and #1035 by narrowing the junction function from cristae formation to inner mitochondrial membrane organization, removing the weak cristae-formation graph edge, and grounding the Eukaryota scope row to GO:0044284.

Source: data/structures/membrane_organelle/mitochondrial_crista_junction.yaml