cellular bud membrane

GO:0033101 · Envelope · Membrane · Proposed

The specialized plasma-membrane region that surrounds a cellular bud. [GO:0033101]

Synonyms: bud membrane

Part of: cellular bud (GO:0005933); plasma membrane (GO:0005886)

Xrefs: uniprot.location:SL-0028 — Bud membrane

Components

Component	Type	Part of / acts on	Grounding	Genes	Stoichiometry	Essential	Role
cellular bud lipid bilayer	Lipid	part of	Reviewed label only (reviewed name; no accession asserted)			ESSENTIAL	Specialized plasma-membrane lipid boundary surrounding the daughter bud. `GO:0033101` GO:0033101 identifies the cellular bud membrane as the membrane surrounding the bud. `uniprot.location:SL-0028` — Bud membrane UniProt SL-0028 maps Bud membrane to GO:0033101 and places it under both Bud and Cell membrane. `GO:0005886` GO:0005886 is the plasma membrane term corresponding to the UniProt Cell membrane parent location.

NCBITaxon:4932 Saccharomyces cerevisiae — COMMON: Budding yeast forms a membrane-bounded daughter bud during polarized mitotic growth. [DOI:10.1083/jcb.135.3.725]

NCBITaxon:4932 Saccharomyces cerevisiae — Budding-yeast model in which polarized exocytic sites form on small bud membranes during bud growth. [DOI:10.1016/S0092-8674(00)80948-4]

polarized bud membrane growth — The bud membrane is the plasma-membrane domain around the daughter bud that expands as polarized secretion delivers membrane to bud growth sites.
- GO:0033101 GO:0033101 identifies the membrane surrounding a cellular bud.
- DOI:10.1016/S0092-8674(00)80948-4 Finger et al. 1998 characterized Sec3p as a spatial landmark for polarized secretion in budding yeast.

The cellular bud membrane is the specialized plasma-membrane patch that surrounds the daughter bud.

Subject	Predicate	Object	Evidence
cellular bud membrane	surrounds	cellular bud	`GO:0033101` GO:0033101 identifies the membrane surrounding the cellular bud. `uniprot.location:SL-0028` — Bud membrane UniProt SL-0028 places the bud membrane under the Bud subcellular location.
cellular bud membrane	is part of	plasma membrane	`uniprot.location:SL-0028` — Bud membrane UniProt SL-0028 places the bud membrane under the Cell membrane location. `GO:0005886` GO:0005886 is the plasma membrane term corresponding to the UniProt Cell membrane location.

INTERPRETATION (RESOLVED): Keep exocyst and polarity proteins off the cellular bud membrane component list. Sec3p and the Pea2/Spa2 polarity module localize to budding sites, but they are curated as exocyst or polarisome constituents rather than as structural constituents of the bud membrane lipid boundary.

GO:0033101 Gene Ontology cellular-component term for the cellular bud membrane.
GO:0016020 Gene Ontology cellular-component term for membrane.
GO:0005933 Gene Ontology cellular-component term for the cellular bud.
GO:0005886 Gene Ontology cellular-component term for the plasma membrane.
uniprot.location:SL-0028 — Bud membrane UniProt Subcellular Location entry SL-0028 maps Bud membrane to GO:0033101 and places it under Bud and Cell membrane.
uniprot.location:SL-0027 — Bud UniProt Subcellular Location entry SL-0027 maps the parent Bud location to GO:0005933.
DOI:10.1083/jcb.135.3.725 Valtz and Herskowitz 1996 studied Saccharomyces Pea2/Spa2 polarity proteins during budding and mating.
DOI:10.1016/S0092-8674(00)80948-4 Finger et al. 1998, 'Sec3p is a spatial landmark for polarized secretion in budding yeast', Cell.

2026-09-15T00:03:40Z codex · CREATED_RECORD — Scaffolded by scripts/new_record.py
2026-09-15T00:04:18Z codex · EXPANDED_RECORD — Added UniProt bud-membrane synonymy and xref, membrane parentage, cellular-bud and plasma-membrane parthood, a reviewed-label-only lipid component, budding-yeast distribution and example evidence, a polarized bud-membrane growth function, GO/UniProt/DOI evidence, a nonmechanistic topology graph, and an exocyst/polarity-factor boundary decision.
2026-09-15T00:13:27Z codex · FIXED_DISCUSSION_ANCHOR — Replaced the bare components discussion anchor with components#cellular_bud_lipid_bilayer so the boundary decision resolves to the local lipid-boundary component.
2026-09-15T00:30:36Z codex · ADDRESSED_REVIEW — Resolved #908 by adding GO:0016020 evidence for the generic membrane parent declared on the cellular bud membrane record.