All families / PF09327
PF09327: Phage_Tail_Tip
Bacteriophage tail tip fiber protein
- Curation status
- SEEDED
- Seed status
- EX DUF
- Characterization
- UNSCORED
Grounding
PF09327: Bacteriophage tail tip fiber protein
IPR015406: integrated entry for Bacteriophage tail tip fiber protein
Source description
The Tail Tip Fiber Protein family includes proteins involved in the attachment and penetration of bacteriophages into host cells. Members of this family are responsible for recognizing and irreversibly binding to specific host receptors, which triggers structural changes in the viral tail necessary for the injection of viral DNA into the host. This process is critical for the successful infection and propagation of the virus. The family includes proteins that initiate distal tail tip assembly during phage tail assembly and play a key role in the virus entry by mediating the attachment to the host receptor and inducing DNA ejection through the receptor's pore. This entry represents the beta prism domain which is formed from a homotrimeric complex of members of this family.
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 |
|---|---|---|---|
| A0A6M3YMB5 | Tip attachment protein J Escherichia phage SECphi4 | 1139 aa; version 1 UniProt 2026_03 | UNIPROT FETCH1 sibling references |
| P03749 | Tip attachment protein J Escherichia phage lambda | 1132 aa; version 1 UniProt 2026_03 | UNIPROT FETCH |
| P0DXX7 | Tip attachment protein J Escherichia phage SECphi27 | 1192 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
- 1,499
- matches
- 1,531
- proteomes
- 1,211
- taxa
- 2,365
- structures
- 14
- alphafold models
- 418
- domain architectures
- 53
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.