half bridge of spindle pole body

GO:0005825 · Cytoskeleton · Multiprotein complex · Proposed

Structure adjacent to the plaques of the spindle pole body. [GO:0005825]

Part of: spindle pole body (GO:0005816)

Taxonomic distribution

NCBITaxon:4932 Saccharomyces cerevisiae — COMMON: Budding yeast is a characterized fungal model in which SPB duplication starts at a half-bridge adjacent to the existing spindle pole body. [DOI:10.1146/annurev.cellbio.20.022003.114106]

NCBITaxon:4932 Saccharomyces cerevisiae — Budding-yeast reference system in which the layered SPB and its half-bridge-associated duplication pathway have been characterized. [DOI:10.1146/annurev.cellbio.20.022003.114106]

spindle pole body duplication site — The half-bridge next to an existing budding-yeast SPB provides the site where new SPB assembly begins.
- DOI:10.1146/annurev.cellbio.20.022003.114106 Jaspersen and Winey 2004 reviewed the half-bridge-associated pathway for budding-yeast SPB duplication.

The half bridge is adjacent to the SPB plaques and marks where a new budding-yeast spindle pole body begins to assemble.

Subject	Predicate	Object	Evidence
half bridge of spindle pole body	is part of	spindle pole body	`GO:0005825` GO:0005825 defines the half bridge as a structure adjacent to the plaques of the spindle pole body.
half bridge of spindle pole body	templates assembly of	new spindle pole body	`DOI:10.1146/annurev.cellbio.20.022003.114106` Jaspersen and Winey 2004 reviewed the half-bridge-associated pathway for SPB duplication.

INTERPRETATION (RESOLVED): Keep the spindle-pole-body half bridge distinct from the inner, central, and outer plaques. GO:0005825 denotes the half bridge adjacent to SPB plaques, while GO:0005822, GO:0005823, and GO:0005824 denote the nuclear inner, central, and cytoplasmic outer plaques.
CURATION_TODO (OPEN): Resolve exact source-neutral family groundings for half-bridge constituents. The first GO-backed half-bridge record captures the duplication-site substructure without guessing exact InterPro, Pfam, NCBIfam, or Complex Portal groundings for the budding-yeast half-bridge proteins.

GO:0005825 Gene Ontology cellular-component term for the half bridge of the spindle pole body.
GO:0005816 Gene Ontology cellular-component term for the spindle pole body that includes the half bridge.
GO:0005822 Gene Ontology cellular-component term for the inner plaque of the spindle pole body.
GO:0005823 Gene Ontology cellular-component term for the central plaque of the spindle pole body.
GO:0005824 Gene Ontology cellular-component term for the outer plaque of the spindle pole body.
DOI:10.1146/annurev.cellbio.20.022003.114106 Jaspersen and Winey 2004, The budding yeast spindle pole body: structure, duplication, and function, Annual Review of Cell and Developmental Biology.

2026-09-29T08:42:00Z codex · CREATED_RECORD — Scaffolded by scripts/new_record.py
2026-09-29T08:43:34Z codex · EXPANDED_RECORD — Added spindle-pole-body parthood, Saccharomyces scope, a duplication-site function, GO and literature evidence, a nonmechanistic half-bridge topology graph, and plaque-boundary discussions.