vapC23 Family assigned · medium auto-curated
H37Rv Rv2863 · MTBC0 mtbc0_003045 ·
126 aa · 3195658–3196038 (+) ·
RefSeq NP_217379.1
Annotation: from legacy to revised
| Legacy (H37Rv / Mycobrowser) | ribonuclease VapC23 |
|---|---|
| MTBC0 PGAP re-annotation | type II toxin-antitoxin system VapC family toxin |
| Revised (this work) | Type II toxin-antitoxin system VapC family toxin. Pfam: PIN (PF01850.28). |
Auto-curated: this verdict and function were generated by rules from PGAP + Pfam + Foldseek and have not been hand-reviewed.
Curated reference (UniProt)
| UniProt |
P9WF89
SwissProt · reviewed
· Inferred from homology
|
|---|---|
| UniProt name | Ribonuclease VapC23 |
| EC (curated) |
EC 3.1.-.-
|
| Curated function | Toxic component of a type II toxin-antitoxin (TA) system. An RNase. The cognate antitoxin is VapB23 (By similarity). |
Functional vocabulary (eggNOG-mapper, orthology transfer)
| COG category |
G Carbohydrate transport and metabolism
|
|---|---|
| eggNOG description | Toxic component of a toxin-antitoxin (TA) module. An RNase |
| Orthologous group | COG1848 |
| KEGG orthology |
K07064
|
Orthology-based transfer (eggNOG 5.0.2, diamond). EC/KO/GO/CAZy are computed annotations, not manual curation; cross-check against the primary literature before treating a specific reaction as established.
Conservation & selection (intra-MTBC, 145 209 strains)
| pN/pS | 0.34 · purifying |
|---|---|
| Polymorphic sites (≥ 0.1% of strains) | 2 synonymous, 2 missense, 0 nonsense, 0 frameshift |
pN/pS from segregating SNPs (singletons removed) normalised by possible sites. Low pN/pS = purifying selection (a strong signal that a "hypothetical" is a real, constrained gene). A high pN/pS is ambiguous: relaxed constraint or positive selection (drug resistance, antigenic variation) inflate it; e.g. rpoB/katG/pncA score high here for resistance, not loss of function. A clonal disruption (one allele over a clade) suggests lineage pseudogenisation; a convergent one (many independent alleles) is typical of resistance loss-of-function.
Domains (Pfam, hmmscan --cut_ga)
| Pfam | Accession | i-Evalue | Residues | Description |
|---|---|---|---|---|
PIN | PF01850.28 | 1.3e-21 | 2–121 | PIN domain |
Functional interaction network (STRING v12, guilt-by-association)
Closest characterised functional partner: vapB23 (antitoxin VapB23), high confidence from genomic context alone (score 833 excluding text-mining).
| Partner | Product | Score | No text-mining | Channels (≥400) |
|---|---|---|---|---|
Rv2862A vapB23 |
antitoxin VapB23 | 833 | 833 ctx | neighborhood:833 |
Rv2862c hyp |
hypothetical protein | 543 | 543 ctx | neighborhood:543 |
Rv2861c mapB |
methionine aminopeptidase | 460 | 460 ctx | neighborhood:459 |
Rv0748 vapB31 |
antitoxin VapB31 | 404 | 405 | |
Rv2871 vapB43 |
antitoxin VapB43 | 752 | 403 | textmining:602 |
Rv0616A vapB29 |
antitoxin VapB29 | 664 | 62 | textmining:657 |
Rv3181c vapB49 |
antitoxin VapB45 | 658 | 59 | textmining:652 |
Rv0596c vapB4 |
antitoxin VapB4 | 631 | 58 | textmining:625 |
Rv2548 vapC19 |
ribonuclease VapC19 | 425 | 51 | textmining:419 |
Rv2757c vapC21 |
ribonuclease VapC21 | 444 | 48 | textmining:440 |
Rv0624 vapC30 |
ribonuclease VapC30 | 522 | 47 | textmining:519 |
Rv0661c vapC7 |
ribonuclease VapC7 | 544 | 46 | textmining:542 |
Rv0595c vapC4 |
ribonuclease VapC4 | 531 | 45 | textmining:530 |
Rv0229c vapC51 hyp |
hypothetical protein | 433 | 45 | textmining:431 |
Rv0582 vapC26 |
ribonuclease VapC26 | 652 | 44 | textmining:651 |
STRING combines evidence channels (neighborhood, fusion, cooccurrence, coexpression, experimental, database, text-mining) into a 0–1000 score. The ctx badge marks edges carried by the genomic-context channels (conserved neighborhood, fusion, phylogenetic co-occurrence), which are independent of orthology and structure and the strongest signal for an unknown gene. The no text-mining column recomputes the score from data alone, so a link that does not depend on the literature is visible. Association is a function hypothesis, not proof: corroborate with the operon context and the primary literature before assigning a function.
Evidence
- Legacy H37Rv annotation: ribonuclease VapC23
- MTBC0 PGAP product: type II toxin-antitoxin system VapC family toxin
- Pfam (hmmscan --cut_ga): PIN PF01850.28 (E=1e-21)
- (auto-curated by rules from PGAP + Pfam + Foldseek; not hand-reviewed)
Sources
- Ancestral sequence & coordinates: Harrison LB et al. (2024), An imputed ancestral reference genome for the MTBC, doi:10.1101/2023.09.07.556366
- Product annotation: NCBI PGAP on MTBC0; legacy from H37Rv NC_000962.3 (RefSeq NP_217379.1)
- Domains: Pfam-A via hmmscan --cut_ga — PIN (PF01850.28)
- Sequence-level signal: ESM Atlas (EvolutionaryScale × BioHub) — exploratory
- Controlled vocabulary: eggNOG-mapper 2.1.12 (Cantalapiedra et al. 2021,
doi:10.1093/molbev/msab293), eggNOG 5.0 DB
(Huerta-Cepas et al. 2019) — OG
COG1848 - Curated reference: UniProt P9WF89 (SwissProt, reviewed; Inferred from homology)
- Intra-MTBC selection: pN/pS and disruption from SPDI variants of 145 209 MTBC strains (this work, local collection vs H37Rv NC_000962.3)
- Interaction network: STRING v12.0 (Szklarczyk et al. 2023,
doi:10.1093/nar/gkac1000), taxon 83332, CC-BY 4.0 —
26 functional partner(s); context anchor
vapB23 - Primary literature: none located yet; annotation rests on the domain/homology sources above.
Ancestral MTBC0 protein sequence
>mtbc0_003045|Rv2863|vapC23 MIFVDTNVFMYAVGRDHPLRMPAREFLEHSLEHQDRLVTSAEAMQELLNAYVPVGRNSTLDSALTLVRALTEIWPVEAADVAHARTLHHRHPGLGARDLLHLACCQRRGVTRIKTFDHTLASAFRS