All families / PF06133
PF06133: Com_YlbF
Control of competence regulator ComK, YlbF/YmcA
- Curation status
- SEEDED
- Seed status
- EX DUF
- Characterization
- UNSCORED
Grounding
PF06133: Control of competence regulator ComK, YlbF/YmcA
IPR010368: integrated entry for Control of competence regulator ComK, YlbF/YmcA
Source description
YlbF Is a family of short Gram-positive and archaeal proteins that includes both YlbF and YmcA which may interact synergistically. The family is necessary for correct biofilm formation, as null mutants of ymcA and ylbF fail to form pellicles at air-liquid interfaces and grow on solid media as smooth, undifferentiated colonies. During development, YmcA, YlbF and YaaT, family PSPI, PF04468 (Pfam entry), interact directly with one another forming a stable ternary complex, in vitro. All three proteins are required for competence, sporulation and the formation of biofilms. The YmcA-YlbF-YaaT complex affects the phosphotransfer between Spo0F and Spo0B, thus accelerating the production of Spo0A~P. The three processes of biofilm formation, mature spore formation and competence all require the active, phosphorylated form of Spo0A, as Spo0A-P [InterPro reference PUB00075458,InterPro reference PUB00075459].
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
3 verified sequence examples. FASTA
| UniProt | Protein / organism | Sequence | Provenance |
|---|---|---|---|
| O07542 | UPF0342 protein YheA Bacillus subtilis (strain 168) | 117 aa; version 1 UniProt 2026_03 | UNIPROT FETCH |
| O31779 | Uncharacterized protein YmcA Bacillus subtilis (strain 168) | 143 aa; version 1 UniProt 2026_03 | UNIPROT FETCH |
| O34412 | Regulatory protein YlbF Bacillus subtilis (strain 168) | 149 aa; version 1 UniProt 2026_03 | UNIPROT FETCH |
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
- 6,153
- matches
- 6,154
- proteomes
- 2,937
- taxa
- 4,407
- structures
- 6
- alphafold models
- 4,127
- domain architectures
- 3
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.