All families / PF16220
PF16220: DUF4880
Domain of unknown function (DUF4880)
- Curation status
- SEEDED
- Seed status
- UNKNOWN CANDIDATE
- Characterization
- UNSCORED
Grounding
PF16220: Domain of unknown function (DUF4880)
IPR032623: integrated entry for Domain of unknown function (DUF4880)
Source description
This domain can be found on the N-terminal of uncharacterized proteins from various Rhodopseudomonas and Pseudomonas species, often, but not always followed by the ron siderophore sensor protein family (FecR, PF04773). The function of this domain is unknown.
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
1 verified sequence example. FASTA
| UniProt | Protein / organism | Sequence | Provenance |
|---|---|---|---|
| P23485 | Ferric citrate uptake sigma factor regulator FecR Escherichia coli (strain K12) | 317 aa; version 1 UniProt 2026_03 | PTM REGISTRY MIRROR9 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
- 11,207
- matches
- 11,207
- proteomes
- 2,574
- taxa
- 3,666
- structures
- 2
- alphafold models
- 6,020
- domain architectures
- 15
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 |
|---|---|---|---|---|
| DUF4880 (PF16220) | ProteinTraitsMech | sigma factor antagonist activity | P23485 Ferric citrate uptake sigma factor regulator FecR | canonical example family classification |
| DUF4880 (PF16220) | ProteinTraitsMech | ferric citrate uptake sigma factor regulator FecR | P23485 Ferric citrate uptake sigma factor regulator FecR | canonical example family classification |
| DUF4880 (PF16220) | ProteinTraitsMech | FecR, N-terminal | P23485 Ferric citrate uptake sigma factor regulator FecR | canonical example family classification |
| DUF4880 (PF16220) | ProteinTraitsMech | FecR, N-terminal | trait identifier | |
| DUF4880 (PF16220) | ProteinTraitsMech | FecR protein | P23485 Ferric citrate uptake sigma factor regulator FecR | canonical example family classification |
| DUF4880 (PF16220) | ProteinTraitsMech | Domain of unknown function (DUF4880) | P23485 Ferric citrate uptake sigma factor regulator FecR | canonical example family classification |
| DUF4880 (PF16220) | ProteinTraitsMech | Domain of unknown function (DUF4880) | trait identifier | |
| DUF4880 (PF16220) | ProteinTraitsMech | FecR protein | P23485 Ferric citrate uptake sigma factor regulator FecR | canonical example family classification |
| DUF4880 (PF16220) | ProteinTraitsMech | CATH homologous superfamily 2.60.120.1440 | P23485 Ferric citrate uptake sigma factor regulator FecR | canonical example family classification |
| DUF4880 (PF16220) | ProteinTraitsMech | CATH homologous superfamily 3.55.50.30 | P23485 Ferric citrate uptake sigma factor regulator FecR | 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.