All families / PF11818
PF11818: DUF3340
C-terminal domain of tail specific protease (DUF3340)
- Curation status
- SEEDED
- Seed status
- UNKNOWN CANDIDATE
- Characterization
- UNSCORED
Grounding
PF11818: C-terminal domain of tail specific protease (DUF3340)
IPR020992: integrated entry for C-terminal domain of tail specific protease (DUF3340)
Source description
This presumed domain is found at the C-terminus of tail specific proteases. Its function is unknown. This family is found in bacteria and eukaryotes. This presumed domain is typically between 88 to 187 amino acids in length.
Evidence and references
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
| UniProt | Protein / organism | Sequence | Provenance |
|---|---|---|---|
| P23865 | Tail-specific protease Escherichia coli (strain K12) | 682 aa; version 2 UniProt 2026_03 | PTM REGISTRY MIRROR2 sibling references |
| P43669 | Tail-specific protease Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720) | 682 aa; version 2 UniProt 2026_03 | UNIPROT FETCH1 sibling references |
| P45306 | Tail-specific protease Haemophilus influenzae (strain ATCC 51907 / DSM 11121 / KW20 / Rd) | 695 aa; version 1 UniProt 2026_03 | UNIPROT FETCH1 sibling references |
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
- 5,206
- matches
- 5,206
- proteomes
- 4,982
- taxa
- 6,747
- structures
- 6
- alphafold models
- 3,243
- domain architectures
- 12
Classification basis
short name matches duf; description says unknown function
No scoring reasons supplied.
Related Mech records
| Family | Mech | Record | Protein | Link basis |
|---|---|---|---|---|
| DUF3340 (PF11818) | ProteinTraitsMech | Tail specific protease, C-terminal | trait identifier | |
| DUF3340 (PF11818) | ProteinTraitsMech | C-terminal domain of tail specific protease (DUF3340) | P23865 Tail-specific protease | canonical example family classification |
| DUF3340 (PF11818) | ProteinTraitsMech | C-terminal domain of tail specific protease (DUF3340) | P43669 Tail-specific protease | canonical example family classification |
| DUF3340 (PF11818) | ProteinTraitsMech | C-terminal domain of tail specific protease (DUF3340) | P45306 Tail-specific protease | canonical example family classification |
| DUF3340 (PF11818) | ProteinTraitsMech | C-terminal domain of tail specific protease (DUF3340) | trait identifier |
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.