pseudohyphal septin ring

GO:0032170 · Cytoskeleton · Filament · Proposed

A tight ring-shaped structure that forms in the division plane at the junction between the mother cell and a pseudohyphal projection; composed of septins as well as septin-associated proteins. [GO:0032170]

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
septin proteins	Protein	part of	Reviewed label only (reviewed name; no accession asserted)			ESSENTIAL	Septin GTPases that assemble into the ring-shaped structure at the mother-cell/pseudohyphal-projection junction. `GO:0032170` GO:0032170 defines the pseudohyphal septin ring as composed of septins and septin-associated proteins. `GO:0005940` GO:0005940 defines the broader septin ring as a septin- and septin-associated-protein structure.

Mechanism graphs

Pseudohyphal septin-ring topology (ASSEMBLY)

Septin proteins form a ring-shaped structure at the junction between the mother cell and a pseudohyphal projection.

Subject	Predicate	Object	Evidence
septin proteins	assemble into	pseudohyphal septin ring	`GO:0032170` GO:0032170 defines the pseudohyphal septin ring as composed of septins and septin-associated proteins.
pseudohyphal septin ring	forms at	mother-cell/pseudohyphal-projection junction	`GO:0032170` GO:0032170 places the pseudohyphal septin ring at the mother-cell/pseudohyphal-projection junction.

Discussions

INTERPRETATION (RESOLVED): Keep the pseudohyphal septin ring distinct from other localized fungal septin-ring states. GO:0032170 denotes the septin ring at the junction between a mother cell and a pseudohyphal projection, while GO:0005940 denotes the broader septin ring class. This record models only the pseudohyphal-projection subtype.
CURATION_TODO (OPEN): Resolve exact source-neutral family groundings and boundary status for pseudohyphal septin-ring septins and septin-associated proteins. The first pseudohyphal septin-ring record keeps only the reviewed-label-only septin protein cohort rather than guessing fungal-paralog family groundings or adding septin-associated proteins before their exact constituent boundary has been reviewed.

Evidence

GO:0032170 Gene Ontology cellular-component term for the pseudohyphal septin ring.
GO:0005940 Gene Ontology cellular-component parent term for the septin ring.

Curation history

2026-09-29T00:54:39Z codex · CREATED_RECORD — Scaffolded by scripts/new_record.py
2026-09-29T00:55:23Z codex · EXPANDED_RECORD — Added septin-ring parentage, a reviewed-label-only septin constituent, GO evidence, a nonmechanistic pseudohyphal-ring topology graph, and boundary and component-grounding discussions.
2026-09-29T01:13:11Z codex · ADDRESSED_REVIEW — Resolved #1753 by tightening the GO:0032170 graph-edge evidence note for the pseudohyphal septin-protein constituent edge.

Source: data/structures/cytoskeleton/pseudohyphal_septin_ring.yaml