All families / PF19336
PF19336: DUF5921
Domain of unknown function (DUF5921)
- Curation status
- SEEDED
- Seed status
- UNKNOWN CANDIDATE
- Characterization
- UNSCORED
Grounding
PF19336: Domain of unknown function (DUF5921)
IPR045803: integrated entry for Domain of unknown function (DUF5921)
Source description
This family represents a domain of unknown function located between the Transcription factor IIIC subunit delta N-term (PF12657 (Pfam entry)) and the Putative zinc-finger of transcription factor IIIC complex (PF12660 (Pfam entry)) within the transcription Factor IIIC 90 kDa subunit (TFIIIC-delta/TFIIIC90, also known as general transcription factor 3C polypeptide 4). TFIIIC is a multisubunit complex that directly recognises promoter elements and recruits TFIIIB and RNA polymerase III, being absolutely required for RNA polymerase III transcription. TFIIIC90 has an intrinsic histone acetyltransferase activity with a substrate specificity for histone H3 [InterPro reference PUB00056254]. This domain is likely to be involved in the interaction with other components of the TFIIIC complex.
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
2 verified sequence examples. FASTA
| UniProt | Protein / organism | Sequence | Provenance |
|---|---|---|---|
| Q8BMQ2 | General transcription factor 3C polypeptide 4 Mus musculus | 817 aa; version 2 UniProt 2026_03 | UNIPROT FETCH |
| Q9UKN8 | General transcription factor 3C polypeptide 4 Homo sapiens | 822 aa; version 2 UniProt 2026_03 | PTM REGISTRY MIRROR |
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
- 807
- matches
- 808
- proteomes
- 656
- taxa
- 2,039
- structures
- 3
- alphafold models
- 720
- domain architectures
- 8
Classification basis
short name matches duf; name says unknown function; description says unknown function; domain of unknown function
No scoring reasons supplied.
Related Mech records
| Family | Mech | Record | Protein | Link basis |
|---|---|---|---|---|
| DUF5921 (PF19336) | ProteinTraitsMech | transcription factor TFIIIC complex | Q9UKN8 General transcription factor 3C polypeptide 4 | canonical example family classification |
| DUF5921 (PF19336) | ProteinTraitsMech | Domain of unknown function DUF5921 | Q8BMQ2 General transcription factor 3C polypeptide 4 | canonical example family classification |
| DUF5921 (PF19336) | ProteinTraitsMech | Domain of unknown function DUF5921 | Q9UKN8 General transcription factor 3C polypeptide 4 | canonical example family classification |
| DUF5921 (PF19336) | ProteinTraitsMech | Domain of unknown function DUF5921 | trait identifier | |
| DUF5921 (PF19336) | ProteinTraitsMech | Transcription factor IIIC, 90kDa subunit, N-terminal | Q8BMQ2 General transcription factor 3C polypeptide 4 | canonical example family classification |
| DUF5921 (PF19336) | ProteinTraitsMech | Transcription factor IIIC, 90kDa subunit, N-terminal | Q9UKN8 General transcription factor 3C polypeptide 4 | canonical example family classification |
| DUF5921 (PF19336) | ProteinTraitsMech | Transcription factor IIIC, putative zinc-finger | Q8BMQ2 General transcription factor 3C polypeptide 4 | canonical example family classification |
| DUF5921 (PF19336) | ProteinTraitsMech | Transcription factor IIIC, putative zinc-finger | Q9UKN8 General transcription factor 3C polypeptide 4 | canonical example family classification |
| DUF5921 (PF19336) | ProteinTraitsMech | Domain of unknown function (DUF5921) | Q8BMQ2 General transcription factor 3C polypeptide 4 | canonical example family classification |
| DUF5921 (PF19336) | ProteinTraitsMech | Domain of unknown function (DUF5921) | Q9UKN8 General transcription factor 3C polypeptide 4 | canonical example family classification |
| DUF5921 (PF19336) | ProteinTraitsMech | Domain of unknown function (DUF5921) | trait identifier | |
| DUF5921 (PF19336) | ProteinTraitsMech | Putative zinc-finger of transcription factor IIIC complex | Q8BMQ2 General transcription factor 3C polypeptide 4 | canonical example family classification |
| DUF5921 (PF19336) | ProteinTraitsMech | Putative zinc-finger of transcription factor IIIC complex | Q9UKN8 General transcription factor 3C polypeptide 4 | canonical example family classification |
| DUF5921 (PF19336) | ProteinTraitsMech | Transcription factor IIIC subunit delta bet-propeller domain | Q8BMQ2 General transcription factor 3C polypeptide 4 | canonical example family classification |
| DUF5921 (PF19336) | ProteinTraitsMech | Transcription factor IIIC subunit delta bet-propeller domain | Q9UKN8 General transcription factor 3C polypeptide 4 | canonical example family classification |
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.