tatC Family assigned · medium auto-curated
H37Rv Rv2093c · MTBC0 mtbc0_002227 ·
308 aa · 2380727–2381653 (-) ·
RefSeq NP_216609.1
Annotation: from legacy to revised
| Legacy (H37Rv / Mycobrowser) | Sec-independent protein translocase transmembrane protein TatC |
|---|---|
| MTBC0 PGAP re-annotation | twin-arginine translocase subunit TatC |
| Revised (this work) | Twin-arginine translocase subunit TatC. Pfam: TatC (PF00902.24). |
Auto-curated: this verdict and function were generated by rules from PGAP + Pfam + Foldseek and have not been hand-reviewed.
Curated reference (UniProt)
| UniProt |
P9WG97
SwissProt · reviewed
· Evidence at protein level
|
|---|---|
| UniProt name | Sec-independent protein translocase protein TatC |
| Curated function | Part of the twin-arginine translocation (Tat) system that transports large folded proteins containing a characteristic twin-arginine motif in their signal peptide across membranes. Together with TatB, TatC is part of a receptor directly interacting with Tat signal peptides. |
Functional vocabulary (eggNOG-mapper, orthology transfer)
| COG category |
U Intracellular trafficking, secretion and vesicular transport
|
|---|---|
| Preferred name | tatC |
| eggNOG description | Part of the twin-arginine translocation (Tat) system that transports large folded proteins containing a characteristic twin-arginine motif in their signal peptide across membranes. Together with TatB, TatC is part of a receptor directly interacting with Tat signal peptides |
| Orthologous group | COG0805 |
| KEGG orthology |
K03118
|
| KEGG pathways |
map03060, map03070
|
| KEGG modules |
M00336
|
| Gene Ontology (54) |
GO:0003674, GO:0005215, GO:0005575, GO:0005622, GO:0005623, GO:0005737, GO:0005829, GO:0005886, GO:0006810, GO:0006886, GO:0008104, GO:0008150 +42 more
|
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 | 0.264 · purifying |
|---|---|
| Polymorphic sites (≥ 0.1% of strains) | 4 synonymous, 3 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 |
|---|---|---|---|---|
TatC | PF00902.24 | 2.2e-65 | 29–252 | Sec-independent protein translocase protein (TatC) |
Functional interaction network (STRING v12, guilt-by-association)
Closest characterised functional partner: tatA (Sec-independent protein translocase membrane-bound protein TatA), high confidence from genomic context alone (score 983 excluding text-mining).
| Partner | Product | Score | No text-mining | Channels (≥400) |
|---|---|---|---|---|
Rv2094c tatA |
Sec-independent protein translocase membrane-bound protein TatA | 994 | 983 ctx | neighborhood:787 coexpression:706 experimental:629 textmining:668 |
Rv1224 tatB |
Sec-independent protein translocase protein TatB | 984 | 930 | coexpression:710 experimental:629 textmining:782 |
Rv2092c helY |
ATP-dependent DNA helicase HelY | 821 | 822 ctx | neighborhood:815 |
Rv2097c pafA |
proteasome accessory factor PafA | 646 | 646 ctx | neighborhood:641 |
Rv2091c |
membrane protein | 624 | 624 ctx | neighborhood:614 |
Rv2096c pafB |
proteasome accessory factor B | 623 | 623 ctx | neighborhood:611 |
Rv2095c pafC |
proteasome accessory factor C | 616 | 617 ctx | neighborhood:611 |
Rv0846c mmcO |
oxidase | 637 | 564 | experimental:563 |
Rv3396c guaA |
GMP synthase | 494 | 495 | |
Rv2109c prcA |
proteasome subunit alpha | 494 | 492 | |
Rv0529 ccsA |
cytochrome C-type biogenesis protein CcsA | 532 | 471 ctx | cooccurence:427 |
Rv2099c PE21 |
Rv2099c, (MTCY49.39c), len: 58 aa. PE21, Member of the Mycobacterium tuberculosis PE family (see Brennan and Delogu, 2002); 5'-end of Rv2098 | 498 | 453 ctx | neighborhood:450 |
Rv2098c PE_PGRS36 |
PE-PGRS family protein PE_PGRS36; Rv2098c, (MTCY49.38c), len: 434 aa. PE_PGRS36,Member of the Mycobacterium tuberculosis PE family, PGRS sub | 497 | 452 ctx | neighborhood:450 |
Rv2110c prcB |
proteasome subunit beta | 415 | 412 | |
Rv2196 qcrB |
ubiquinol-cytochrome C reductase cytochrome subunit B | 430 | 372 |
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: Sec-independent protein translocase transmembrane protein TatC
- MTBC0 PGAP product: twin-arginine translocase subunit TatC
- Pfam (hmmscan --cut_ga): TatC PF00902.24 (E=2e-65)
- (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_216609.1)
- Domains: Pfam-A via hmmscan --cut_ga — TatC (PF00902.24)
- 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
COG0805 - Curated reference: UniProt P9WG97 (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 —
52 functional partner(s); context anchor
tatA - Primary literature: none located yet; annotation rests on the domain/homology sources above.
Ancestral MTBC0 protein sequence
>mtbc0_002227|Rv2093c|tatC MRAAGLLKRLNPRNRRSRVNPDATMSLVDHLTELRTRLLISLAAILVTTIFGFVWYSHSIFGLDSLGEWLRHPYCALPQSARADISADGECRLLATAPFDQFMLRLKVGMAAGIVLACPVWFYQLWAFITPGLYQRERRFAVAFVIPAAVLFVAGAVLAYLVLSKALGFLLTVGSDVQVTALSGDRYFGFLLNLLVVFGVSFEFPLLIVMLNLAGLLTYERLKSWRRGLIFAMFVFAAIFTPGSDPFSMTALGAALTVLLELAIQIARVHDKRKAKREAAIPDDEASVIDPPSPVPAPSVIGSHDDVT