FB2026_03 , released September 17, 2026

CV Term Report

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General Information

Term

Pwp2p-containing subcomplex of 90S preribosome

ID (Ontology)

GO:0034388 (Gene Ontology)

Definition

A protein complex that forms a subcomplex of the 90S preribosome and can interact directly with the 5' External Transcribed Spacer (ETS) of the full length pre-rRNA transcript. In S. cerevisiae, it sediments at 25-30 S and is composed of Pwp2p, Dip2p, Utp21p, Utp13p, Utp18p, and Utp6p.[ PubMed:15231838 ]

Also Known As

"25-30 S subcomplex of 90S preribosome" ; "UTP-B complex"

Comment

Links to External Ontologies

QuickGO data AmiGO data

Annotations

Records annotated with this term OR any of its CHILD TERMS

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Direct annotations: records annotated with this exact term (child terms are NOT included)

Data Class	Field	Direct annotations
Genes (FBgn)	GO_CELLULAR_COMPONENT

Full annotation statements including this term (annotations to child terms are NOT included), and relevant FlyBase records

Full annotation statements	Relevant FlyBase reports
Full annotation statements	Genes
Pwp2p-containing subcomplex of 90S preribosome (all annotations which use CV term, excluding "NOT" statements)
part_of \| Pwp2p-containing subcomplex of 90S preribosome

Spanning Tree (Parents/Children)

nucleus
 |__nuclear protein-containing complex__
preribosome                             |
 |__90S preribosome_____________________|
nuclear lumen                           |
 |__nucleolus___________________________|
protein-containing complex              |
 |__nuclear protein-containing complex__|
intracellular membraneless organelle    |
 |__nucleolus___________________________|
                                        Pwp2p-containing subcomplex of 90S preribosome  5 rec.

Spanning Tree View Settings
Parents/Children View Depth	Show hierarchy levels: for parents, for children
Relationships
Is a	nuclear protein-containing complex
Part of	nucleolus 90S preribosome
Synonyms & Secondary IDs
Synonyms
	"25-30 S subcomplex of 90S preribosome" EXACT "UTP-B complex" EXACT
Secondary IDs

External Crossreferences & Linkouts