Rv3897c Still unknown · low auto-curated
H37Rv Rv3897c · MTBC0 - ·
210 aa · 4383008–4383640 (-) ·
RefSeq NP_218414.1
Annotation: from legacy to revised
| Legacy (H37Rv / Mycobrowser) | hypothetical protein |
|---|---|
| MTBC0 PGAP re-annotation | — |
| Revised (this work) | Conserved hypothetical protein; no recognised domain. Function unknown. |
Auto-curated: this verdict and function were generated by rules from PGAP + Pfam + Foldseek and have not been hand-reviewed.
Annotated on the H37Rv protein: this gene has no 1:1 ancestral MTBC0 anchor (PE/PPE, paralogue, IS element, or otherwise unanchored CDS).
Curated reference (UniProt)
| UniProt |
O07036
TrEMBL · unreviewed
· Predicted
|
|---|---|
| UniProt name | Uncharacterized protein |
UniProt still lists this protein as Uncharacterized protein; the revised annotation above is ahead of the current UniProt record.
Functional vocabulary (eggNOG-mapper, orthology transfer)
| Orthologous group | 2BK8T |
|---|
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 | 0.915 · relaxed/neutral |
|---|---|
| Polymorphic sites (≥ 0.1% of strains) | 4 synonymous, 10 missense, 0 nonsense, 2 frameshift |
| Disruption | 2 distinct premature-stop/frameshift site(s); most common in 97.70% of strains (141870) · reference-fixed |
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)
No Pfam-A domain above the gathering threshold (or not yet scanned).
Functional interaction network (STRING v12, guilt-by-association)
Closest characterised functional partner: eccC2 (ESX-2 type VII secretion system protein EccC), medium confidence from genomic context alone (score 491 excluding text-mining). This association is the citable seed of a function hypothesis for this hypothetical protein.
| Partner | Product | Score | No text-mining | Channels (≥400) |
|---|---|---|---|---|
Rv3898c hyp |
hypothetical protein | 803 | 803 ctx | neighborhood:757 |
Rv1617 pykA |
pyruvate kinase | 513 | 513 | coexpression:513 |
Rv3900c hyp |
hypothetical protein | 495 | 495 ctx | neighborhood:490 |
Rv3894c eccC2 |
ESX-2 type VII secretion system protein EccC | 490 | 491 ctx | neighborhood:475 |
Rv3895c eccB2 |
ESX-2 secretion system protein EccB | 502 | 488 ctx | neighborhood:480 |
Rv3896c hyp |
hypothetical protein | 487 | 487 ctx | neighborhood:472 |
Rv3899c hyp |
hypothetical protein | 479 | 479 ctx | neighborhood:476 |
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
- Annotation from H37Rv (no MTBC0 1:1 anchor; H37Rv protein used): hypothetical protein
- (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_218414.1)
- Domains: Pfam-A via hmmscan --cut_ga — none above threshold
- 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
2BK8T - Curated reference: UniProt O07036 (TrEMBL, unreviewed; Predicted)
- Intra-MTBC selection: pN/pS and disruption from SPDI variants of 145 209 MTBC strains (this work, local collection vs H37Rv NC_000962.3)
- Model confidence: ESMFold per-residue pLDDT (mean 76.9, confident)
- Interaction network: STRING v12.0 (Szklarczyk et al. 2023,
doi:10.1093/nar/gkac1000), taxon 83332, CC-BY 4.0 —
7 functional partner(s); context anchor
eccC2 - Primary literature: none located yet; annotation rests on the domain/homology sources above.
Ancestral MTBC0 protein sequence
>H37Rv|Rv3897c| MMQQAVSGITGALGGAVGGVMGPLTQLPQQAMQAGQGAMQPLMSALQQTYGAEGLDVADGARLVDSIEGEPGLGGEPGAGDVGAGGGGGGTTPTGYLGPPPVPTSSPPTTPAGAPAKSVTPDPVSGTPRASGPAGMTGMPMVPPGALGAGAEGANKDKPVEKRVTGCAEWSTGQGPLNSTAECSGEICRRQAGGHQVDATDPCCAERRQG