inner plaque of spindle pole body

GO:0005822 · Cytoskeleton · Multiprotein complex · Proposed

One of three laminate structures that form the spindle pole body; the inner plaque is in the nucleus. [GO:0005822]

Part of: spindle pole body (GO:0005816)

Taxonomic distribution

NCBITaxon:4932 Saccharomyces cerevisiae — COMMON: Budding yeast is a characterized fungal model for the nuclear inner plaque of the 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 nuclear inner plaque have been characterized. [DOI:10.1146/annurev.cellbio.20.022003.114106]

nuclear microtubule organization — The inner plaque is the nuclear face of the budding-yeast SPB that organizes nuclear microtubule nucleation.
- DOI:10.1146/annurev.cellbio.20.022003.114106 Jaspersen and Winey 2004 reviewed the budding-yeast SPB inner plaque as the nuclear site for microtubule nucleation.

The inner plaque is the nuclear laminate of the budding-yeast spindle pole body and organizes nuclear microtubule nucleation.

Subject	Predicate	Object	Evidence
inner plaque of spindle pole body	is part of	spindle pole body	`GO:0005822` GO:0005822 defines the inner plaque as one of the laminate structures that form the spindle pole body.
inner plaque of spindle pole body	organizes	nuclear microtubule	`DOI:10.1146/annurev.cellbio.20.022003.114106` Jaspersen and Winey 2004 reviewed the budding-yeast SPB inner plaque as the nuclear site for microtubule nucleation.

INTERPRETATION (RESOLVED): Keep the spindle-pole-body inner plaque distinct from the central and outer plaques. GO:0005822 denotes a nuclear laminate structure of the spindle pole body, while GO:0005823 denotes the nuclear-envelope-embedded central plaque and GO:0005824 denotes the cytoplasmic outer plaque.
CURATION_TODO (OPEN): Resolve exact source-neutral family groundings for inner-plaque constituents. The first GO-backed inner-plaque record captures the lamina as a named SPB substructure without guessing exact InterPro, Pfam, NCBIfam, or Complex Portal groundings for the budding-yeast plaque proteins and associated gamma-tubulin complexes.

GO:0005822 Gene Ontology cellular-component term for the inner plaque of the spindle pole body.
GO:0005816 Gene Ontology cellular-component term for the spindle pole body that includes the inner plaque.
GO:0005880 Gene Ontology cellular-component term for nuclear microtubule, the structure organized by the inner plaque in the topology graph.
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.

2026-09-29T08:16:27Z codex · CREATED_RECORD — Scaffolded by scripts/new_record.py
2026-09-29T08:17:03Z codex · EXPANDED_RECORD — Added spindle-pole-body parthood, Saccharomyces scope, nuclear microtubule-organization function, GO and literature evidence, a nonmechanistic topology graph, and plaque-boundary discussions.