cyanelle inner membrane

GO:0036012 · Membrane organelle · Membrane · Proposed

The inner, i.e. lumen-facing, lipid bilayer of the cyanelle envelope; also faces the cyanelle stroma. [GO:0036012]

Synonyms: cyanelle inner envelope membrane

Part of: cyanelle envelope (GO:0033112)

Xrefs: uniprot.location:SL-0480 — Cyanelle inner membrane

Components

Component	Type	Part of / acts on	Grounding	Genes	Stoichiometry	Essential	Role
cyanelle inner lipid bilayer	Lipid	part of	Reviewed label only (reviewed name; no accession asserted)			ESSENTIAL	Lumen-facing lipid bilayer that separates the cyanelle stroma from the intermembrane space. `GO:0036012` GO:0036012 defines the cyanelle inner membrane as the lumen-facing lipid bilayer of the cyanelle envelope that also faces the cyanelle stroma. `uniprot.location:SL-0480` — Cyanelle inner membrane UniProt SL-0480 maps directly to GO:0036012 and describes the same stroma/intermembrane-space boundary.

NCBITaxon:38254 Glaucocystophyceae — COMMON: The cyanelle inner membrane is the stroma-facing envelope boundary of glaucophyte cyanelles. [uniprot.location:SL-0480 — Cyanelle inner membrane]
NCBITaxon:2762 Cyanophora paradoxa — COMMON: Cyanophora paradoxa cyanelles have distinct inner and outer membranes in their double cyanelle envelopes. [DOI:10.1104/pp.71.2.409]

NCBITaxon:2762 Cyanophora paradoxa — Model glaucophyte used for ultrastructural studies of the inner and outer cyanelle envelope membranes. [DOI:10.1104/pp.71.2.409]

The cyanelle inner membrane is the lumen-facing lipid bilayer that separates the cyanelle stroma from the intermembrane space.

Subject	Predicate	Object	Evidence
cyanelle inner membrane	is part of	cyanelle envelope	`GO:0036012` GO:0036012 defines this inner membrane as a lipid bilayer of the cyanelle envelope. `uniprot.location:SL-0480` — Cyanelle inner membrane UniProt SL-0480 places the cyanelle inner membrane under the cyanelle envelope.
cyanelle inner membrane	bounds	cyanelle stroma	`GO:0036012` GO:0036012 defines this membrane by its lumen-facing position and states that it also faces the cyanelle stroma. `GO:0034060` GO:0034060 identifies the cyanelle stroma as the space enclosed by the double membrane of a cyanelle.
cyanelle inner membrane	delimits	cyanelle intermembrane space	`uniprot.location:SL-0480` — Cyanelle inner membrane UniProt SL-0480 describes the cyanelle inner membrane as separating the cyanelle stroma from the intermembrane space. `GO:0036014` GO:0036014 defines the cyanelle intermembrane space as the region between the inner and outer lipid bilayers of the envelope.

CURATION_TODO (OPEN): Resolve an exact source-neutral grounding for the lipid constituent of the cyanelle inner membrane. The record is exactly grounded to GO:0036012 and UniProt SL-0480, but the lipid bilayer constituent is intentionally left as a reviewed-label-only component until an exact source-neutral lipid or membrane-constituent CURIE is curated.

GO:0036012 Gene Ontology cellular-component term for cyanelle inner membrane.
GO:0009528 Gene Ontology cellular-component term for plastid inner membrane.
GO:0033113 Gene Ontology cellular-component term for the generic cyanelle membrane parent.
GO:0033112 Gene Ontology cellular-component term for cyanelle envelope.
GO:0036014 Gene Ontology cellular-component term for the cyanelle intermembrane space.
GO:0034060 Gene Ontology cellular-component term for cyanelle stroma.
uniprot.location:SL-0480 — Cyanelle inner membrane UniProt Subcellular Location entry SL-0480 maps Cyanelle inner membrane to GO:0036012 and places it under cyanelle membrane and plastid inner membrane.
DOI:10.1104/pp.71.2.409 Giddings, Wasmann and Staehelin 1983, Structure of the Thylakoids and Envelope Membranes of the Cyanelles of Cyanophora paradoxa, Plant Physiology.
DOI:10.1128/jb.178.2.332-339.1996 Pfanzagl et al. 1996, Primary structure of cyanelle peptidoglycan of Cyanophora paradoxa: a prokaryotic cell wall as part of an organelle envelope, Journal of Bacteriology.

2026-09-12T21:06:06Z codex · CREATED_RECORD — Scaffolded by scripts/new_record.py
2026-09-12T21:06:48Z codex · EXPANDED_RECORD — Added the GO synonym, plastid-inner and cyanelle-membrane parentage, cyanelle-envelope parthood, the UniProt SL-0480 xref, a reviewed-label-only inner lipid bilayer component, glaucophyte distribution, a Cyanophora paradoxa canonical example, a nonmechanistic topology graph, and a lipid-bilayer grounding TODO.
2026-09-12T21:13:07Z codex · ADDRESS_REVIEW — Resolved #706 by narrowing the Cyanophora paradoxa taxonomic note to the inner/outer cyanelle envelope membranes directly supported by Giddings et al. 1983.
2026-09-21T10:04:10Z codex · REPLACED_UNREADABLE_EVIDENCE — Replaced unreadable Jackson et al. 2015 Glaucophyta evidence with reachable cyanelle evidence for #1231.