All families / PF05949
PF05949: DUF881
Bacterial protein of unknown function (DUF881)
- Curation status
- SEEDED
- Seed status
- UNKNOWN CANDIDATE
- Characterization
- UNSCORED
Grounding
PF05949: Bacterial protein of unknown function (DUF881)
IPR010273: integrated entry for Bacterial protein of unknown function (DUF881)
Source description
This family consists of a series of hypothetical bacterial proteins. One of the family members Q45543 (UniProtKB protein) from Bacillus subtilis is thought to be involved in cell division and sporulation [InterPro reference PUB00011928].
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
4 verified sequence examples. FASTA
| UniProt | Protein / organism | Sequence | Provenance |
|---|---|---|---|
| C0SPA3 | UPF0749 protein YlxW Bacillus subtilis (strain 168) | 231 aa; version 1 UniProt 2026_03 | PTM REGISTRY MIRROR |
| P9WFG2 | UPF0749 protein MT1873 Mycobacterium tuberculosis (strain CDC 1551 / Oshkosh) | 292 aa; version 1 UniProt 2026_03 | UNIPROT FETCH1 sibling references |
| P9WFG3 | UPF0749 protein Rv1825 Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv) | 292 aa; version 1 UniProt 2026_03 | UNIPROT FETCH1 sibling references |
| Q45544 | UPF0749 protein YlxX Bacillus subtilis (strain 168) | 235 aa; version 3 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
- 8,824
- matches
- 8,826
- proteomes
- 3,335
- taxa
- 4,412
- structures
- 1
- alphafold models
- 5,317
- domain architectures
- 6
Classification basis
short name matches duf; name says unknown function
No scoring reasons supplied.
Related Mech records
| Family | Mech | Record | Protein | Link basis |
|---|---|---|---|---|
| DUF881 (PF05949) | ProteinTraitsMech | Bacterial protein of unknown function (DUF881) | C0SPA3 UPF0749 protein YlxW | canonical example family classification |
| DUF881 (PF05949) | ProteinTraitsMech | Bacterial protein of unknown function (DUF881) | P9WFG2 UPF0749 protein MT1873 | canonical example family classification |
| DUF881 (PF05949) | ProteinTraitsMech | Bacterial protein of unknown function (DUF881) | P9WFG3 UPF0749 protein Rv1825 | canonical example family classification |
| DUF881 (PF05949) | ProteinTraitsMech | Bacterial protein of unknown function (DUF881) | trait identifier | |
| DUF881 (PF05949) | ProteinTraitsMech | Protein of unknown function DUF881 | C0SPA3 UPF0749 protein YlxW | canonical example family classification |
| DUF881 (PF05949) | ProteinTraitsMech | Protein of unknown function DUF881 | Q45544 UPF0749 protein YlxX | 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.