organellar chromatophore intermembrane space

GO:0070115 · Membrane organelle · Subcellular region · Proposed

The region between the inner and outer lipid bilayers that surround an organellar chromatophore. [GO:0070115]

Synonyms: Paulinella-type chromatophore intermembrane space

Part of: organellar chromatophore (GO:0070111)

Xrefs: uniprot.location:SL-0360 — Organellar chromatophore intermembrane space

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
organellar chromatophore peptidoglycan wall	Peptidoglycan	part of	Reviewed label only (reviewed name; no accession asserted)			UNKNOWN	Residual bacterial cell-wall layer positioned in the organellar chromatophore intermembrane space between the inner and outer envelope membranes. `uniprot.location:SL-0351` — Organellar chromatophore UniProt Subcellular Location SL-0351 describes the organellar chromatophore as being surrounded by two membranes with a residual peptidoglycan wall between them.

Taxonomic distribution

NCBITaxon:39716 Paulinella — VARIABLE: UniProt SL-0360 constrains organellar chromatophore intermembrane spaces to Paulinella species without asserting that every Paulinella species carries an organellar chromatophore. [uniprot.location:SL-0360 — Organellar chromatophore intermembrane space]

Mechanism graphs

Organellar chromatophore intermembrane-space topology (FUNCTION)

The organellar chromatophore intermembrane space lies between the inner and outer organellar chromatophore membranes and contains a residual peptidoglycan wall.

Subject	Predicate	Object	Evidence
organellar chromatophore outer membrane	delimits	organellar chromatophore intermembrane space	`GO:0070115` GO:0070115 defines this space as the region between the inner and outer lipid bilayers around an organellar chromatophore. `uniprot.location:SL-0360` — Organellar chromatophore intermembrane space UniProt SL-0360 describes the space as the intermembrane space between the inner and outer organellar chromatophore membranes.
organellar chromatophore inner membrane	delimits	organellar chromatophore intermembrane space	`GO:0070115` GO:0070115 defines this space as the region between the inner and outer lipid bilayers around an organellar chromatophore. `uniprot.location:SL-0359` — Organellar chromatophore inner membrane UniProt SL-0359 defines the organellar chromatophore inner membrane as separating the stroma from the intermembrane space.
organellar chromatophore peptidoglycan wall	resides in	organellar chromatophore intermembrane space	`uniprot.location:SL-0351` — Organellar chromatophore UniProt SL-0351 states that a residual peptidoglycan wall is found between the two organellar chromatophore membranes.

Discussions

CURATION_TODO (OPEN): Resolve an exact source-neutral grounding for the residual peptidoglycan wall in the organellar chromatophore intermembrane space. UniProt SL-0351 supports the placement of residual peptidoglycan between the two organellar chromatophore membranes, but the curated GO and UniProt authority terms identify the whole intermembrane space rather than a standalone peptidoglycan wall.

Evidence

GO:0070115 Gene Ontology cellular-component term for the organellar chromatophore intermembrane space.
GO:0009529 Gene Ontology cellular-component term for plastid intermembrane space, the broader plastid envelope region.
GO:0070111 Gene Ontology cellular-component term for the organellar chromatophore that this space is part of.
GO:0070113 Gene Ontology cellular-component term for the organellar chromatophore inner membrane that delimits this space.
GO:0070114 Gene Ontology cellular-component term for the organellar chromatophore outer membrane that delimits this space.
uniprot.location:SL-0359 — Organellar chromatophore inner membrane UniProt Subcellular Location entry SL-0359 maps directly to GO:0070113 and describes the organellar chromatophore inner membrane as separating the chromatophore stroma from the intermembrane space.
uniprot.location:SL-0360 — Organellar chromatophore intermembrane space UniProt Subcellular Location entry SL-0360 maps directly to GO:0070115, places it under plastid intermembrane space, and describes its Paulinella-specific taxonomic range.
uniprot.location:SL-0351 — Organellar chromatophore UniProt Subcellular Location entry SL-0351 describes the organellar chromatophore as a Paulinella photosynthetic inclusion with two membranes and a residual peptidoglycan wall between them.

Curation history

2026-09-12T19:07:11Z codex · CREATED_RECORD — Scaffolded by scripts/new_record.py
2026-09-12T19:07:46Z codex · EXPANDED_RECORD — Added the GO synonym, plastid intermembrane-space parentage, organellar chromatophore parthood, UniProt SL xref, a reviewed-label-only residual peptidoglycan-wall component, Paulinella distribution, a nonmechanistic envelope topology graph, and a peptidoglycan-wall grounding TODO.
2026-09-12T19:14:40Z codex · ADDRESS_REVIEW — Resolved #694 by adding record-level UniProt SL-0359 evidence for the inner-membrane boundary citation used in the topology graph.

Source: data/structures/membrane_organelle/organellar_chromatophore_intermembrane_space.yaml