KpKP13 Protein target profile

DNA topoisomerase III

Accession: KP13_05413

Gene: topB AHE45057.1 3D evidence: AlphaFold DB model + ColabFold model UniProt A0AAX1BU08
Length 648
Pocket druggability (P2Rank · AlphaFold DB model) 0.703
Direct ligand evidence 0 53 total records
Functional annotation 0 EC 4 GO
Target summary

Promising target candidate with multiple supporting evidence streams.

Automated synthesis of the evidence currently loaded. Review the underlying records before prioritizing this protein.

Terms and data sources used on this page

PDB: experimentally determined structures from the Protein Data Bank. These are the strongest structural evidence, but may cover only part of the protein.

AlphaFold DB model: a precomputed predicted structure downloaded from AlphaFold Database/UniProt, not an experiment performed here.

ColabFold model: a predicted structure generated for this workspace; interpret it with coverage and confidence.

pLDDT: confidence score for predicted structures. High values support local geometry; low values mean the region should not drive pocket interpretation.

FPocket / P2Rank: software tools that predict possible ligand-binding pockets on a 3D structure. They are useful screening signals, not experimental validation.

Druggability: a pocket-based estimate of whether a small molecule could bind productively. It does not mean a drug already exists.

PDB ligand: a compound observed in an experimental structure. Direct same-protein records are stronger than homolog-transferred records.

ChEMBL: a public database of measured compound bioactivity. Direct entries are stronger than entries transferred from similar proteins.

ZINC: a purchasable-compound database. Here it marks proposed candidates from chemical similarity, not measured binders.

LigQ / LigQ_2: an internal Target pipeline step that gathers PDB, ChEMBL, and ZINC ligand evidence for each protein.

Off-target: sequence similarity to proteins we prefer not to hit, such as human proteins or beneficial gut microbiome proteins.

DEG: Database of Essential Genes. A match suggests the protein resembles genes known to be essential in other organisms.

Roary / CoreCruncher: pan-genome tools used to decide whether a gene is core across analyzed strains or accessory/strain-specific.

EC / GO: functional annotations: EC describes enzyme reactions; GO describes biological process, molecular function, or cellular component.

KEGG pathway: a curated metabolic route label used here to group reactions imported from the metabolic model.

Chokepoint: a metabolic reaction that is the only producer or consumer of a metabolite in the imported model.

Prioritization evidence

Selectivity, essentiality, structural confidence, conservation, and predicted binding-site evidence.

Off-target risk

Human off-target
Hit
Human identity (%)
21.809 Lower values reduce human off-target concern.
Human E-value
1.26e-23
Gut microbiome similarity
3.0% of screened genomes Lower prevalence suggests narrower overlap with the screened gut microbiome.

Essentiality

Essential (DEG)
Y
DEG identity (%)
89.358 Higher values support similarity to known essential genes.
DEG E-value
0.0 Smaller values mean stronger essential-gene similarity.

Structure confidence

ColabFold pLDDT
93.59 0-100 confidence; >70 supports local structural interpretation.

Binding-site evidence

AlphaFold DB / UniProt model

P2Rank's binding-site probability is the primary druggability signal shown across the app; FPocket's druggability score is shown alongside it for comparison. Both estimate small-molecule pocket quality after applying the curated structure priority — neither is experimental binding evidence. The 3D viewer may show a different loaded structure, so visible pockets can differ.

Druggability (P2Rank) 0.703
Structure A0AAX1BU08
Pocket Pocket 1
Druggability (FPocket) 0.81
Structure A0AAX1BU08
Pocket Pocket 1
ColabFold model
P2Rank 0.722 · Pocket 1
FPocket 0.9 · Pocket 2
Core conservation Accessory gene
Roary accessory
CoreCruncher accessory
Gut microbiome 140 / 4744 genomes with a hit
Prevalence 3.0%

Sequence

Primary amino-acid sequence viewer.

MRLFIAEKPSLGRAIADVLPKPHRKGDGYIECGNGQVVTWCIGHLLEQAQPDIYDSRYARWNLNDLPIVPEKWQLQPKPSVTKQLNVIKRLLGDAEEVIHAGDPDREGQLLVDEVLDYLQLAPEKRQQVQRCLINDLNPQAVERAINRLRANSEFVPLCVSALARARADWLYGINMTRAYTLLGRNAGYQGVLSVGRVQTPVLGLVVRRDEEIENFVAKDFFDVKAHIVTPQEERFVATWVPSEACEPYQDEEGRLLHRPLAEHVVKRIEGQPAIVTGYNDKRDSEPAPLPFSLSALQIEAAKRFGFSAQNVLDICQKLYETHKLITYPRSDSRYLPEEHFAGRHAVLNAIAVHAADLLPQPVVDPEIRNRCWDDKKVDAHHAIIPTARSSQVKLTDNEAKVYTLIARQYLMQFCPDAVFRKCQIDLEIANGKFVAKARFLAEAGWRTLLGSKERDEENDGTPLPVVAKGDELLCERGEVVERQTQPPRHFTDATLLSAMTGIARFVQDKDLKKILRATDGLGTEATRAGIIELLFKRGFLSKKGRYIHSSEAGRALIHSLPEMAGRPDMTAHWESVLTQISEKQCRYQDFMQPLVGTLYQLIDQARSTPVRQFRGLVGPGGAKKSFSKGKGKPKGKKAVDDTAPPPQ

Functional annotations

Enzyme classification and Gene Ontology terms linked to this protein.

4 GO

Subcellular localization

Localization
Cytoplasmic

Gene Ontology (GO)

4
  • GO:0006265 The process in which a transformation is induced in the topological structure of a double-stranded DNA helix, resulting in a change in linking number.
  • GO:0003917 Catalysis of a DNA topological transformation by transiently cleaving one DNA strand at a time to allow passage of another strand; changes the linking number by +1 per catalytic cycle.
  • GO:0003677 Any molecular function by which a gene product interacts selectively and non-covalently with DNA (deoxyribonucleic acid).
  • GO:0003916 Catalysis of the transient cleavage and passage of individual DNA strands or double helices through one another, resulting a topological transformation in double-stranded DNA.

Sequence domains and features

Domain and signature matches imported from InterPro and related databases.

47 records
Show feature table
Start End DB Term Name
1 644 Hamap MF_00953 DNA topoisomerase 3 [topB].
1 644 InterPro IPR005738 DNA topoisomerase III
158 593 Pfam PF01131 DNA topoisomerase
158 593 InterPro IPR013497 DNA topoisomerase, type IA, central
1 156 Gene3D G3DSA:3.40.50.140 -
217 488 Gene3D G3DSA:2.70.20.10 Topoisomerase I, domain 3
217 488 InterPro IPR013825 DNA topoisomerase, type IA, central region, subdomain 2
1 626 NCBIfam TIGR01056 DNA topoisomerase III
1 626 InterPro IPR005738 DNA topoisomerase III
1 124 SMART SM00493 toprim5
1 124 InterPro IPR006171 TOPRIM domain
317 332 ProSitePatterns PS00396 Prokaryotic DNA topoisomerase I active site.
317 332 InterPro IPR023406 DNA topoisomerase, type IA, active site
280 558 SMART SM00437 topIaneu2
280 558 InterPro IPR003602 DNA topoisomerase, type IA, DNA-binding domain
475 593 FunFam G3DSA:1.10.460.10:FF:000004 DNA topoisomerase 3
157 603 CDD cd00186 TOP1Ac
157 603 InterPro IPR013497 DNA topoisomerase, type IA, central
162 593 Gene3D G3DSA:1.10.460.10 Topoisomerase I, domain 2
162 593 InterPro IPR013824 DNA topoisomerase, type IA, central region, subdomain 1
290 416 FunFam G3DSA:1.10.290.10:FF:000004 DNA topoisomerase 3
290 416 Gene3D G3DSA:1.10.290.10 Topoisomerase I, domain 4
290 416 InterPro IPR013826 DNA topoisomerase, type IA, central region, subdomain 3
128 223 SMART SM00436 topIban2
128 223 InterPro IPR003601 DNA topoisomerase, type IA, domain 2
1 156 FunFam G3DSA:3.40.50.140:FF:000004 DNA topoisomerase 3
1 607 SUPERFAMILY SSF56712 Prokaryotic type I DNA topoisomerase
1 607 InterPro IPR023405 DNA topoisomerase, type IA, core domain
402 418 PRINTS PR00417 Prokaryotic DNA topoisomerase I signature
402 418 InterPro IPR013497 DNA topoisomerase, type IA, central
323 332 PRINTS PR00417 Prokaryotic DNA topoisomerase I signature
323 332 InterPro IPR013497 DNA topoisomerase, type IA, central
193 211 PRINTS PR00417 Prokaryotic DNA topoisomerase I signature
193 211 InterPro IPR013497 DNA topoisomerase, type IA, central
521 535 PRINTS PR00417 Prokaryotic DNA topoisomerase I signature
521 535 InterPro IPR013497 DNA topoisomerase, type IA, central
98 111 PRINTS PR00417 Prokaryotic DNA topoisomerase I signature
98 111 InterPro IPR013497 DNA topoisomerase, type IA, central
1 134 ProSiteProfiles PS50880 Toprim domain profile.
1 134 InterPro IPR006171 TOPRIM domain
3 135 Pfam PF01751 Toprim domain
3 135 InterPro IPR006171 TOPRIM domain
1 149 CDD cd03362 TOPRIM_TopoIA_TopoIII
1 149 InterPro IPR034144 DNA topoisomerase 3-like, TOPRIM domain
617 648 MobiDBLite mobidb-lite consensus disorder prediction
2 607 PANTHER PTHR11390 PROKARYOTIC DNA TOPOISOMERASE
2 607 InterPro IPR000380 DNA topoisomerase, type IA

3D structure

Selected loaded structure. Experimental PDB entries may cover only a portion of the sequence; AlphaFold DB and ColabFold models typically cover the full protein but remain computational predictions.

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Pocket score High Medium Low
How colors and pocket overlays are used
Uniform protein color marks the displayed model as a single molecular object.
Experimental PDB structures may be colored by chain to distinguish subunits or copies present in the file.
Pocket colors and alpha spheres are evidence overlays for predicted binding cavities; they are not alternative protein chains.
'Alpha spheres' is FPocket's own cavity-shape geometry, imported when available and aligned with the loaded structure.
'Pocket atoms'/'Predicted site atoms' show the pocket's residue atoms instead: P2Rank reports residues rather than alpha spheres, and FPocket falls back to this when alpha-sphere geometry is unavailable or doesn't align.
'No pocket geometry' means neither alpha spheres nor residue-position data could be found for that pocket; the layer just highlights the same residues as 'Nearby residues'.
Pocket details Inspect a specific pocket, or open the full viewer

Binding pockets · P2Rank

Druggability (P2Rank): high ≥ 0.5 · medium 0.2–0.49 · low < 0.2

Pocket 1 P2Rank #1
0.703
Likely same site as FPocket 1 2.3 Å 26 shared residues 100% of smaller site
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Surrounding area
Pocket 2 P2Rank #2
0.573
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Surrounding area
Pocket 3 P2Rank #3
0.144
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Surrounding area
Pocket 4 P2Rank #4
0.137
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Surrounding area
Pocket 5 P2Rank #5
0.12
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Surrounding area

Binding pockets · FPocket

Druggability (FPocket): high ≥ 0.7 · medium 0.4–0.69 · low < 0.4

Pocket 1 FPocket #1
0.81 Unusual size
Likely same site as P2Rank 1 2.3 Å 26 shared residues 100% of smaller site
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Surrounding area
All structural evidence 0 experimental · 2 predicted

Structural evidence

0 + 2

Experimental PDB entries plus predicted AlphaFold DB or ColabFold models. Click Switch to display a different loaded structure in the viewer.

Entry Method Resolution Chain Coverage Links Status
AlphaFold DB AF_A0AAX1BU08
AlphaFold DB full sequence Viewing
ColabFold KP13_05413
ColabFold full sequence Loaded

Ligand evidence

Ligands grouped by evidence source. PDB ligands keep the source crystal visible, and loaded crystals can be opened directly in the structure viewer.

53 records
Chemistry signal

Structural ligand evidence is available for this target.

Direct evidence 0 same-protein records
Transferred evidence 3 records from similar proteins
Structural ligands 3 0 loaded crystals
Measured bioactivity 0 direct and transferred ChEMBL records
Proposed compounds 50 similarity-based ZINC candidates
Best available ligand signal
A3P PDB via homolog 427.2 Da · LogP -1.75 · TPSA 232.6 Open detail RCSB PDB
T3P PDB via homolog Detail RCSB PDB
THP PDB via homolog Detail RCSB PDB
ZINC12501123 ZINC proposed compound · Tanimoto 1.000 Detail ZINC
ZINC4228234 ZINC proposed compound · Tanimoto 1.000 Detail ZINC

Structural evidence inferred from similar proteins. The source crystal indicates where the ligand was observed; the UniProt column identifies the homologous protein carrying that ligand.

Show only:
Ligand Source crystal UniProt (homolog) MW · LogP · TPSA Lipinski PAINS SMILES
A3P RCSB PDB P06612 427.2 Da LogP -1.75 TPSA 232.6 2 viol. ✓ Clean c1nc(c2c(n1)n(cn2)[C@H]3[C@@H]([C@@H]([C@H](O3)…
T3P RCSB PDB P06612 322.2 Da LogP -1.40 TPSA 151.1 ✓ Ro5 ✓ Clean CC1=CN(C(=O)NC1=O)[C@H]2C[C@@H]([C@H](O2)CO)OP(…
THP RCSB PDB P06612 402.2 Da LogP -1.28 TPSA 197.6 ✓ Ro5 ✓ Clean CC1=CN(C(=O)NC1=O)[C@H]2C[C@@H]([C@H](O2)COP(=O…

PDB and ChEMBL records on this protein are shown in full. ChEMBL records from similar proteins are capped at the top 100 per protein (by pchembl) and ZINC at the top 50 (Tanimoto ≥ 0.5). ADME columns are descriptor-based screening flags, not experimental toxicity results.

Cross-references

External database identifiers for this protein, its structures, ligands, and metabolic reactions.