cyanelle membrane

GO:0033113 · Membrane organelle · Membrane · Proposed

Either of the lipid bilayers that surround a cyanelle and form the cyanelle envelope. [GO:0033113]

Part of: cyanelle envelope (GO:0033112)

Components

Component	Type	Part of / acts on	Grounding	Genes	Stoichiometry	Essential	Role
cyanelle envelope lipid bilayer	Lipid	part of	Reviewed label only (reviewed name; no accession asserted)			ESSENTIAL	Generic lipid-bilayer constituent of a cyanelle envelope membrane when the exact inner or outer membrane identity is unspecified. `GO:0033113` GO:0033113 defines a cyanelle membrane as either lipid bilayer that forms the cyanelle envelope. `uniprot.location:SL-0083` — Cyanelle membrane UniProt SL-0083 provides the cyanelle membrane localization entry and notes that it can be used when the exact cyanelle membrane assignment is unresolved.

NCBITaxon:38254 Glaucocystophyceae — COMMON: Cyanelle membranes are envelope lipid bilayers of glaucophyte cyanelles. [GO:0033113]
NCBITaxon:2762 Cyanophora paradoxa — COMMON: Cyanophora paradoxa is a glaucophyte model whose cyanelles have inner and outer envelope membranes. [DOI:10.1104/pp.71.2.409]

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

The generic cyanelle membrane class covers either cyanelle-envelope lipid bilayer when the exact inner or outer membrane identity is unspecified.

Subject	Predicate	Object	Evidence
cyanelle membrane	is part of	cyanelle envelope	`GO:0033113` GO:0033113 defines the generic cyanelle membrane as either bilayer that forms the cyanelle envelope. `GO:0033112` GO:0033112 identifies the complete double lipid bilayer of the cyanelle envelope.
cyanelle inner membrane	is a	cyanelle membrane	`GO:0033113` GO places GO:0036012 as an is_a child of the generic cyanelle membrane term.
cyanelle outer membrane	is a	cyanelle membrane	`GO:0033113` GO places GO:0036013 as an is_a child of the generic cyanelle membrane term.

INTERPRETATION (RESOLVED): Exclude GO:0033115 cyanelle thylakoid membrane from the GO:0033113 cyanelle membrane scope even though UniProt SL-0083 can be used as a fallback thylakoid localization. GO:0033113 is defined as either envelope lipid bilayer that surrounds a cyanelle, whereas GO:0033115 identifies the separate internal thylakoid membrane.
CURATION_TODO (OPEN): Resolve an exact source-neutral grounding for the generic lipid constituent of a cyanelle envelope membrane. The record is exactly grounded to GO:0033113, while UniProt SL-0083 is broader fallback evidence; 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:0033113 Gene Ontology cellular-component term for the generic cyanelle membrane.
GO:0042170 Gene Ontology cellular-component term for plastid membrane.
GO:0033112 Gene Ontology cellular-component term for cyanelle envelope.
GO:0036012 Gene Ontology cellular-component child term for cyanelle inner membrane.
GO:0036013 Gene Ontology cellular-component child term for cyanelle outer membrane.
GO:0033115 Gene Ontology cellular-component term for the distinct cyanelle thylakoid membrane.
uniprot.location:SL-0083 — Cyanelle membrane UniProt Subcellular Location entry SL-0083 maps to GO:0033113 but can also be used when a cyanelle protein's exact outer, inner, or thylakoid membrane assignment is unclear.
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.

2026-09-12T20:21:47Z codex · CREATED_RECORD — Scaffolded by scripts/new_record.py
2026-09-12T20:23:22Z codex · EXPANDED_RECORD — Added plastid-membrane parentage, cyanelle-envelope parthood, the UniProt SL-0083 xref, a reviewed-label-only envelope lipid bilayer component, glaucophyte distribution, a Cyanophora paradoxa canonical example, a nonmechanistic GO-scope graph, and discussions for excluding the thylakoid membrane and grounding the generic lipid bilayer component.
2026-09-12T20:32:15Z codex · ADDRESS_REVIEW — Resolved #702 by demoting UniProt SL-0083 from an exact xref to broader fallback evidence and caveating notes that mention its scope.
2026-09-21T10:04:10Z codex · REPLACED_UNREADABLE_EVIDENCE — Replaced unreadable Jackson et al. 2015 Glaucophyta evidence with reachable cyanelle evidence for #1231.