relB Family assigned · medium auto-curated
H37Rv Rv1247c · MTBC0 mtbc0_001336 ·
89 aa · 1397419–1397688 (-) ·
RefSeq NP_215763.1
Annotation: from legacy to revised
| Legacy (H37Rv / Mycobrowser) | antitoxin RelB |
|---|---|
| MTBC0 PGAP re-annotation | type II toxin-antitoxin system Phd/YefM family antitoxin |
| Revised (this work) | Type II toxin-antitoxin system Phd/YefM family antitoxin. Pfam: PhdYeFM_antitox (PF02604.27). |
Auto-curated: this verdict and function were generated by rules from PGAP + Pfam + Foldseek and have not been hand-reviewed.
Curated reference (UniProt)
| UniProt |
O50462
SwissProt · reviewed
· Evidence at protein level
|
|---|---|
| UniProt name | Antitoxin RelB |
| Curated function | Antitoxin component of a type II toxin-antitoxin (TA) system. Upon expression in M.smegmatis neutralizes the effect of toxin RelE..; FUNCTION: Induces its own promoter, in combination with RelE represses its own promoter. Binds DNA in complex with toxin RelE but not alone. |
Functional vocabulary (eggNOG-mapper, orthology transfer)
| COG category |
K Transcription
|
|---|---|
| Preferred name | relB |
| eggNOG description | antitoxin component of a |
| Orthologous group | COG2161 |
| KEGG orthology |
K19159
|
| Gene Ontology (10) |
GO:0003674, GO:0005488, GO:0005515, GO:0008150, GO:0040008, GO:0045927, GO:0048518, GO:0050789, GO:0065007, GO:0097351
|
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 | 0.0 · strong purifying |
|---|---|
| Polymorphic sites (≥ 0.1% of strains) | 1 synonymous, 0 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 |
|---|---|---|---|---|
PhdYeFM_antitox | PF02604.27 | 1.2e-22 | 1–73 | Antitoxin Phd_YefM, type II toxin-antitoxin system |
Functional interaction network (STRING v12, guilt-by-association)
Closest characterised functional partner: relE (toxin RelE), high confidence from genomic context alone (score 983 excluding text-mining).
| Partner | Product | Score | No text-mining | Channels (≥400) |
|---|---|---|---|---|
Rv1246c relE |
toxin RelE | 997 | 983 ctx | neighborhood:882 cooccurence:774 textmining:878 |
Rv2866 relG |
toxin RelG | 956 | 870 ctx | cooccurence:773 experimental:409 textmining:680 |
Rv3358 relK |
toxin RelK | 956 | 765 | experimental:748 textmining:824 |
Rv1245c |
short-chain type dehydrogenase/reductase | 652 | 652 ctx | neighborhood:651 |
Rv0659c mazF2 |
toxin MazF2 | 665 | 642 ctx | cooccurence:635 |
Rv1942c mazF5 |
toxin MazF5 | 626 | 611 ctx | cooccurence:604 |
Rv1248c kgd |
multifunctional 2-oxoglutarate dehydrogenase E1 component /2-oxoglutarate dehydrogenase dihydrolipoyllysine-residue succinyltransferase | 577 | 577 ctx | neighborhood:564 |
Rv0960 vapC9 |
ribonuclease VapC9 | 504 | 428 ctx | cooccurence:406 |
Rv1720c vapC12 |
ribonuclease VapC12 | 409 | 389 | |
Rv1102c mazF3 |
mRNA interferase MazF3 | 461 | 355 | |
Rv2017 |
transcriptional regulator | 424 | 352 | |
Rv0595c vapC4 |
ribonuclease VapC4 | 459 | 321 | |
Rv2801A mazE9 |
antitoxin MazE9 | 569 | 270 | textmining:434 |
Rv2549c vapC20 |
ribonuclease VapC20 | 410 | 167 | |
Rv0350 dnaK |
chaperone protein DnaK | 528 | 55 | textmining:522 |
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: antitoxin RelB
- MTBC0 PGAP product: type II toxin-antitoxin system Phd/YefM family antitoxin
- Pfam (hmmscan --cut_ga): PhdYeFM_antitox PF02604.27 (E=1e-22)
- (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_215763.1)
- Domains: Pfam-A via hmmscan --cut_ga — PhdYeFM_antitox (PF02604.27)
- 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
COG2161 - Curated reference: UniProt O50462 (SwissProt, reviewed; Evidence at protein level)
- 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 —
20 functional partner(s); context anchor
relE - Primary literature: none located yet; annotation rests on the domain/homology sources above.
Ancestral MTBC0 protein sequence
>mtbc0_001336|Rv1247c|relB MAVVPLGEVRNRLSEYVAEVELTHERITITRHGHPAAVLISADDLASIEETLEVLRTPGASEAIREGLADVAAGRFVSNDEIRNRYTAR