periplastidial membrane

GO:7770041 · Membrane organelle · Membrane · Proposed

The lipid bilayer that forms the second outermost membrane of complex plastids in organisms that acquired their plastids through secondary endosymbiosis. The periplastidial membrane is evolutionarily derived from the plasma membrane of the engulfed algal endosymbiont and together with the outer envelope membrane of the plastid defines the periplastidial compartment. [GO:7770041]

Synonyms: PPM

Part of: plastid (GO:0009536)

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
periplastidial lipid bilayer	Lipid	part of	Reviewed label only (reviewed name; no accession asserted)			ESSENTIAL	Second outermost complex-plastid bilayer derived from the engulfed algal endosymbiont plasma membrane. `GO:7770041` GO:7770041 defines the periplastidial membrane as the second outermost complex-plastid lipid bilayer and describes its endosymbiont plasma-membrane origin. `DOI:10.1016/j.protis.2016.04.001` Flori et al. 2016 analyzed the Phaeodactylum tricornutum periplastidial compartment ultrastructure.

Taxonomic distribution

NCBITaxon:2850 Phaeodactylum tricornutum — COMMON: The diatom Phaeodactylum tricornutum contains a complex secondary plastid with a periplastidial membrane around the periplastidial compartment. [DOI:10.1016/j.protis.2016.04.001]

Canonical examples

NCBITaxon:2850 Phaeodactylum tricornutum — Diatom model used for ultrastructural analysis of the periplastidial compartment and its bounding membranes. [DOI:10.1016/j.protis.2016.04.001]

Functions

periplastidial compartment boundary — The periplastidial membrane forms the second outermost membrane of a secondary complex plastid and helps delimit the periplastidial compartment with the plastid outer envelope membrane.
- GO:7770041 The GO definition states that the periplastidial membrane and the outer plastid envelope membrane together define the periplastidial compartment.
- DOI:10.1007/s10265-005-0214-6 Hashimoto 2005 reviewed the ultrastructure and division of secondary plastids.

Discussions

CURATION_TODO (OPEN): Resolve an exact source-neutral grounding for the lipid constituent of the periplastidial membrane. The record is exactly grounded to GO:7770041, but no exact source-neutral lipid or lipid-bilayer CURIE was curated for the periplastidial membrane matrix.
CURATION_TODO (OPEN): Keep the periplastidial membrane distinct from the epiplastidial membrane and the plastid outer envelope. GO:7770041 denotes the second outermost complex-plastid membrane, whereas GO:7770040 denotes the outermost epiplastidial membrane and GO:0009527 denotes the outer membrane of the canonical plastid envelope.

Evidence

GO:7770041 Gene Ontology cellular-component term for the periplastidial membrane.
GO:0042170 Gene Ontology cellular-component parent term for plastid membrane.
GO:0009536 Gene Ontology cellular-component term for plastid.
DOI:10.1007/s10265-005-0214-6 Hashimoto 2005, The ultrastructural features and division of secondary plastids, Journal of Plant Research.
DOI:10.1016/j.protis.2016.04.001 Flori et al. 2016, Ultrastructure of the Periplastidial Compartment of the Diatom Phaeodactylum tricornutum, Protist.
DOI:10.1093/plcell/koae275 Gueguen et al. 2024, Monogalactosyldiacylglycerol synthase isoforms play diverse roles inside and outside the diatom plastid, The Plant Cell.

Curation history

2026-10-03T05:26:46Z codex · CREATED_RECORD — Scaffolded by scripts/new_record.py
2026-10-03T05:27:32Z codex · EXPANDED_RECORD — Added GO synonymy and plastid-membrane parentage, curated a reviewed-label-only periplastidial lipid-bilayer constituent, added Phaeodactylum tricornutum scope, a periplastidial-compartment boundary function, GO and DOI evidence, and open lipid-grounding and complex-plastid membrane-boundary discussions.

Source: data/structures/membrane_organelle/periplastidial_membrane.yaml