All families / PF12432
PF12432: INTS1_RP2B-bd
Integrator complex subunit 1, RP2B-binding domain
- Curation status
- SEEDED
- Seed status
- EX DUF
- Characterization
- UNSCORED
Grounding
PF12432: Integrator complex subunit 1, RP2B-binding domain
IPR022145: integrated entry for Integrator complex subunit 1, RP2B-binding domain
Source description
Integrator (INT) complex is involved in the small nuclear RNAs (snRNA) U1 and U2 transcription and in their 3'-box-dependent processing. It binds the C-terminal domain (CTD) of RNA polymerase II (Pol II) and functions as an RNA endonuclease to cleave different classes of RNAs, regulating the transcription of both protein-coding genes and noncoding elements [InterPro reference PUB00152015,InterPro reference PUB00153137]. Integrator also associates with protein phosphatase 2A (PP2A) core enzyme to form the INTAC complex [InterPro reference PUB00152015] which regulates transcription through dephosphorylation of Pol II CTD. This entry includes the Integrator complex subunit 1 (INTS1) which forms the backbone module of the complex (it consists of four modules: backbone, shoulder, phosphatase and endonuclease) through the association with INTS2 and INTS7 to form a rigid scaffold. The backbone and shoulder modules form a central cruciform scaffold. INTS1 is an all-alpha helical protein with four repetitive helix hairpin domains towards the C-terminal (R1-R4) [InterPro reference PUB00152015]. This entry represents a domain found at the N-terminal of INTS1, which interacts with Pol II subunit RPB2 and form interface A [InterPro reference PUB00153137].
Evidence and references
- InterPro entry and its literature references. PUB identifiers are internal InterPro references, not PubMed identifiers. Unresolved citations link to the originating entry.
- Frozen description source: InterPro/Pfam API
Source descriptions and links are provenance, not independent functional validation.
Evidence counts: not scored.
Curated functional assertions
No curated functional assertions supplied.
Protein sequence examples
3 verified sequence examples. FASTA
Pfam membership is not functional evidence. Whole-protein sequences do not establish domain boundaries. A coverage gap here is not absence from UniProt.
Sequences and metadata: UniProt Consortium, CC BY 4.0.
Domain matches
No residue-level domain match evidence is available in this build. Structure and AlphaFold counters do not supply coordinates or establish function.
Snapshot counters
- proteins
- 1,741
- matches
- 1,776
- proteomes
- 1,243
- taxa
- 4,101
- structures
- 8
- alphafold models
- 141
- domain architectures
- 35
Classification basis
pfam previous unknown name
No scoring reasons supplied.
Related Mech records
This family joined the worklist after the frozen cross-Mech scan, so other Mechs were not searched for it. Missing links here are not evidence that other Mechs lack it; rows shown come from mentions of a former DUF/UPF name.
No cross-Mech examples are present in the supplied snapshot.
Curation history and reviews
No retained curation events supplied.
No retained review supplied.
Record source
Status and evidence
- Seed status
- A name-based classification of frozen InterPro/Pfam metadata. UNKNOWN CANDIDATE means the metadata explicitly says the function is unknown. KNOWN HISTORICAL DUF means a DUF name matched without that wording; this heuristic is not proof of a known function and does not establish experimental characterization. EX DUF means Pfam renamed the family away from a DUF/UPF name, as recorded in Pfam's previous identifiers; a rename usually follows published work on some members but is naming history, not proof of function for every member. Some EX DUF families' current names or descriptions still say the function is unknown; their classification basis lists this, and scoring does not treat them as characterized. FALSE POSITIVE TEXT HIT means the naming rules did not match.
- Characterization
- A separate evidence-scoring result. UNSCORED means no score has been calculated; it is not evidence that the family lacks a known function. Missing scores are not negative evidence. PARTIALLY CHARACTERIZED has partial support; KNOWN HISTORICAL DUF can inherit the seed label or reflect a known-function signal. Neither label implies experimental validation.
- Evidence counts
- Source-specific signals, not unique proteins, publications, or confidence scores. Known counts Rhea reactions and experimentally supported GO molecular-function annotations. Partial counts functional/domain assignments. Context counts structural, environmental, orthology, interaction and neighborhood signals; context alone does not assign function. Repeated annotations may not be independent.
- Curation status
- Reported separately from seed classification and characterization. SNAPSHOT ONLY means no curated metadata was supplied for this build. SEEDED denotes a source-derived record, not an expert-reviewed functional claim.
- Missing counts
- Not available means the source did not supply that counter. A zero is a reported count. Not scored means evidence counts are unavailable.