outer plaque of mitotic spindle pole body

GO:0061499 · Cytoskeleton · Multiprotein complex · Proposed

One of three laminate structures that form the mitotic spindle pole body; the outer plaque is in the cytoplasm. [GO:0061499]

Part of: mitotic spindle pole body (GO:0044732)

Taxonomic distribution

NCBITaxon:4932 Saccharomyces cerevisiae — COMMON: Budding yeast is a characterized fungal model for the cytoplasmic outer plaque of the mitotic spindle pole body. [DOI:10.1146/annurev.cellbio.20.022003.114106]

NCBITaxon:4932 Saccharomyces cerevisiae — Budding-yeast reference system in which the layered mitotic SPB and its cytoplasmic microtubule-nucleating outer plaque have been reviewed. [DOI:10.1146/annurev.cellbio.20.022003.114106]

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

The mitotic outer plaque is a mitosis-specific SPB outer plaque facing the budding-yeast cytoplasm.

Subject	Predicate	Object	Evidence
outer plaque of mitotic spindle pole body	is a	outer plaque of spindle pole body	`GO:0061499` GO:0061499 is_a GO:0005824 in the Gene Ontology cellular-component hierarchy.
outer plaque of mitotic spindle pole body	is part of	mitotic spindle pole body	`GO:0061499` GO:0061499 defines the outer plaque as one of the laminate structures of the mitotic spindle pole body.
outer plaque of mitotic spindle pole body	organizes	cytoplasmic microtubule	`DOI:10.1146/annurev.cellbio.20.022003.114106` Jaspersen and Winey 2004 reviewed the budding-yeast SPB outer plaque as the cytoplasmic site for microtubule nucleation.

INTERPRETATION (RESOLVED): Keep the mitotic SPB outer plaque narrower than the general SPB outer plaque and distinct from the meiotic outer plaque. GO:0061499 denotes the outer plaque of the mitotic spindle pole body, is narrower than GO:0005824, and is part of the GO:0044732 mitotic spindle pole body. The existing local meiotic outer plaque record denotes a sporulation-specific outer-plaque remodeling product and stays outside this mitotic subtype.
CURATION_TODO (OPEN): Resolve exact source-neutral family groundings for mitotic outer-plaque constituents. This first GO-backed mitotic outer-plaque record captures the cell-cycle-specific layer without guessing exact InterPro, Pfam, NCBIfam, or Complex Portal groundings for budding-yeast outer-plaque proteins.

GO:0061499 Gene Ontology cellular-component term for the outer plaque of the mitotic spindle pole body.
GO:0005824 Gene Ontology parent term for the general outer plaque of the spindle pole body.
GO:0044732 Gene Ontology cellular-component term for the mitotic spindle pole body that includes GO:0061499 by parthood.
GO:0005881 Gene Ontology cellular-component term for cytoplasmic microtubule, the structure organized by the outer plaque.
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.

2026-09-29T15:43:23Z codex · CREATED_RECORD — Scaffolded by scripts/new_record.py
2026-09-29T15:44:17Z codex · EXPANDED_RECORD — Added GO-backed outer-plaque parentage and mitotic-SPB parthood, Saccharomyces scope, a mitotic cytoplasmic microtubule-organization function, GO and literature evidence, a nonmechanistic mitotic outer-plaque topology graph, and boundary/component discussions.