rhoptry lumen

GO:0034591 · Membrane organelle · Subcellular region · Proposed

The volume enclosed by the rhoptry membrane. [GO:0034591]

Part of: rhoptry (GO:0020008)

Taxonomic distribution

NCBITaxon:5794 Apicomplexa — COMMON: Rhoptry lumina are the internal secretory compartments of apicomplexan rhoptries, whose number and morphology vary among lineages and invasive stages. [DOI:10.1128/mmbr.00197-22]

NCBITaxon:5811 Toxoplasma gondii — Apicomplexan model whose rhoptry lumen stores neck and bulb secretory cargo before rhoptry discharge during host-cell invasion. [DOI:10.1038/nrmicro1800]

The rhoptry lumen is the internal rhoptry compartment enclosed by the rhoptry membrane.

Subject	Predicate	Object	Evidence
rhoptry lumen	is part of	rhoptry	`GO:0034591` GO:0034591 identifies the rhoptry lumen cellular component. `GO:0020008` GO:0020008 identifies the containing rhoptry organelle. `DOI:10.1038/nrmicro1800` Boothroyd and Dubremetz 2008 review the rhoptry as a membrane-bounded neck-and-bulb secretory organelle.
rhoptry membrane	encloses	rhoptry lumen	`GO:0034591` GO:0034591 defines the rhoptry lumen as the volume enclosed by the rhoptry membrane. `GO:0033016` GO:0033016 identifies the rhoptry membrane as the lipid bilayer surrounding a rhoptry.

INTERPRETATION (RESOLVED): Keep the rhoptry membrane as the boundary of the rhoptry lumen rather than as a lumen component. GO:0034591 denotes the volume enclosed by the rhoptry membrane, whereas GO:0033016 denotes the lipid bilayer surrounding a rhoptry.

GO:0034591 Gene Ontology cellular-component term for the rhoptry lumen.
GO:0043233 Gene Ontology cellular-component term for organelle lumen, the broader class of organelle-enclosed compartments.
GO:0033016 Gene Ontology cellular-component term for the rhoptry membrane that encloses the rhoptry lumen.
GO:0020008 Gene Ontology cellular-component term for the rhoptry, the organelle that contains this lumen.
DOI:10.1038/nrmicro1800 Boothroyd and Dubremetz 2008, Kiss and spit: the dual roles of Toxoplasma rhoptries, Nature Reviews Microbiology.
DOI:10.1128/mmbr.00197-22 Waller and Carruthers 2024, Adaptations and metabolic evolution of myzozoan protists across diverse lifestyles and environments, Microbiology and Molecular Biology Reviews.

2026-09-13T12:39:19Z codex · CREATED_RECORD — Scaffolded by scripts/new_record.py
2026-09-13T12:39:55Z codex · EXPANDED_RECORD — Added organelle-lumen parentage, rhoptry parthood, Apicomplexa and Toxoplasma gondii scope, GO/DOI evidence, a nonmechanistic rhoptry-lumen topology graph, and a resolved boundary interpretation.