KpKP13 Protein target profile

DNA topoisomerase III

Accession: KP13_06748

Gene: AHE41852.1 3D evidence: AlphaFold DB model + ColabFold model UniProt A0A1C8Y8K9
Length 775
Pocket druggability (P2Rank · AlphaFold DB model) 0.936
Direct ligand evidence 0 53 total records
Functional annotation 1 EC 9 GO
Target summary

Target candidate with partial support; inspect missing evidence before prioritizing.

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 (%)
22.326 Lower values reduce human off-target concern.
Human E-value
3.55e-10
Gut microbiome similarity
0.0% of screened genomes Lower prevalence suggests narrower overlap with the screened gut microbiome.

Essentiality

Essential (DEG)
N
DEG identity (%)
0.0 Higher values support similarity to known essential genes.

Structure confidence

ColabFold pLDDT
92.99 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) 0.936
Structure A0A1C8Y8K9
Pocket Pocket 1
Druggability (FPocket) 0.564
Structure A0A1C8Y8K9
Pocket Pocket 35
ColabFold model
P2Rank 0.918 · Pocket 1
FPocket 0.467 · Pocket 43
Core conservation Accessory gene
Roary accessory
CoreCruncher accessory
Gut microbiome 2 / 4744 genomes with a hit
Prevalence 0.0%

Sequence

Primary amino-acid sequence viewer.

MRLFIAEKPSLAKAIFEGLGGNPNTEKKNGYFEHGSDVVTWCYGHMLELYDPEDYDEKYSNWRFSDLPIKSVYPPQYKIKPESEAQTRIILSLIDKADNIVHAGDPDEEGCLLVDEILGYAKNTKSVYRLLVRDLNLAPVQKALTDLQPNDKFRGMTLSALARSLCDQGFGYNMTRGCTLKGREKGYDGVLNVGRVQSAVLGLVNMRTLANQNHTESFYYDVFASLLMNGHLIKAKYQTTDDDQIDEKKRLISEAQAAHIAGRVTGKDAVVTIATTKPENTKPPLPLNLSTLQQLCAKRFGYSAKDTLDVMQGLYETHKLLTYPRSDNRYLSDEHYYQAGDIATAIAATVPELASAIADMDKSQKHKAFNASKIEAHHAIIPTTKSGAGIQLNEKERNVYNLVSVYFIGLFYPDAIRNKTKIHFDIKGDTFTATQSVLVQKGWEALGKDNDDEDETEDAGTDGFDLSSLKFNDSGLCESADVDKKKTNPPRYFTASTLLAAMTSAAKFIDDPALRKALEAKDEGSEDRGSIGTEATRAGILEKLAANTGLISIEKEKGYSELVWKTTKQGQEFCAALPPEITKPDISALWAEKQSQIKAGELTVEEFIKENDEYVQGLIDELERNGVSISSNATPCPVCNNGFLRKRKGQNGFFWGCSCYPECKTTFPDKDGKPDMEAKSRSEGSMSRLEAPCPSCSKEIIIRPKGFFCSGCEFKIWSEVSGKKLTQNQVETLIKKGKTGEIKGFTSNKTGKKFDAAIVLQDKATGKLGFQFSKK

Functional annotations

Enzyme classification and Gene Ontology terms linked to this protein.

1 EC 9 GO

Subcellular localization

Localization
Cytoplasmic

Enzyme Commission (EC)

1

Gene Ontology (GO)

9
  • 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: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.
  • 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:0005694 A structure composed of a very long molecule of DNA and associated proteins (e.g. histones) that carries hereditary information.
  • GO:0003677 Any molecular function by which a gene product interacts selectively and non-covalently with DNA (deoxyribonucleic acid).
  • GO:0043597 The Y-shaped region of a cytoplasmic replicating DNA molecule, resulting from the separation of the DNA strands and in which the synthesis of new strands takes place. Also includes associated protein complexes.
  • GO:0008270 Binding to a zinc ion (Zn).
  • GO:0006310 Any process in which a new genotype is formed by reassortment of genes resulting in gene combinations different from those that were present in the parents. In eukaryotes genetic recombination can occur by chromosome assortment, intrachromosomal recombination, or nonreciprocal interchromosomal recombination. Interchromosomal recombination occurs by crossing over. In bacteria it may occur by genetic transformation, conjugation, transduction, or F-duction.
  • GO:0006281 The process of restoring DNA after damage. Genomes are subject to damage by chemical and physical agents in the environment (e.g. UV and ionizing radiations, chemical mutagens, fungal and bacterial toxins, etc.) and by free radicals or alkylating agents endogenously generated in metabolism. DNA is also damaged because of errors during its replication. A variety of different DNA repair pathways have been reported that include direct reversal, base excision repair, nucleotide excision repair, photoreactivation, bypass, double-strand break repair pathway, and mismatch repair pathway.

Sequence domains and features

Domain and signature matches imported from InterPro and related databases.

45 records
Show feature table
Start End DB Term Name
126 221 SMART SM00436 topIban2
126 221 InterPro IPR003601 DNA topoisomerase, type IA, domain 2
275 574 SMART SM00437 topIaneu2
275 574 InterPro IPR003602 DNA topoisomerase, type IA, DNA-binding domain
285 413 Gene3D G3DSA:1.10.290.10 Topoisomerase I, domain 4
285 413 InterPro IPR013826 DNA topoisomerase, type IA, central region, subdomain 3
1 623 SUPERFAMILY SSF56712 Prokaryotic type I DNA topoisomerase
1 623 InterPro IPR023405 DNA topoisomerase, type IA, core domain
399 415 PRINTS PR00417 Prokaryotic DNA topoisomerase I signature
399 415 InterPro IPR013497 DNA topoisomerase, type IA, central
100 113 PRINTS PR00417 Prokaryotic DNA topoisomerase I signature
100 113 InterPro IPR013497 DNA topoisomerase, type IA, central
530 544 PRINTS PR00417 Prokaryotic DNA topoisomerase I signature
530 544 InterPro IPR013497 DNA topoisomerase, type IA, central
318 327 PRINTS PR00417 Prokaryotic DNA topoisomerase I signature
318 327 InterPro IPR013497 DNA topoisomerase, type IA, central
191 209 PRINTS PR00417 Prokaryotic DNA topoisomerase I signature
191 209 InterPro IPR013497 DNA topoisomerase, type IA, central
2 727 PANTHER PTHR11390 PROKARYOTIC DNA TOPOISOMERASE
2 727 InterPro IPR000380 DNA topoisomerase, type IA
1 666 NCBIfam TIGR01056 DNA topoisomerase III
1 666 InterPro IPR005738 DNA topoisomerase III
1 126 SMART SM00493 toprim5
1 126 InterPro IPR006171 TOPRIM domain
636 671 Pfam PF01396 Topoisomerase DNA binding C4 zinc finger
636 671 InterPro IPR013498 DNA topoisomerase, type IA, zn finger
160 608 Gene3D G3DSA:1.10.460.10 Topoisomerase I, domain 2
160 608 InterPro IPR013824 DNA topoisomerase, type IA, central region, subdomain 1
312 327 ProSitePatterns PS00396 Prokaryotic DNA topoisomerase I active site.
312 327 InterPro IPR023406 DNA topoisomerase, type IA, active site
156 609 Pfam PF01131 DNA topoisomerase
156 609 InterPro IPR013497 DNA topoisomerase, type IA, central
1 147 CDD cd03362 TOPRIM_TopoIA_TopoIII
1 147 InterPro IPR034144 DNA topoisomerase 3-like, TOPRIM domain
633 668 SUPERFAMILY SSF57783 Zinc beta-ribbon
623 671 Gene3D G3DSA:3.30.65.10 Bacterial Topoisomerase I, domain 1
3 129 Pfam PF01751 Toprim domain
3 129 InterPro IPR006171 TOPRIM domain
1 154 Gene3D G3DSA:3.40.50.140 -
215 490 Gene3D G3DSA:2.70.20.10 Topoisomerase I, domain 3
215 490 InterPro IPR013825 DNA topoisomerase, type IA, central region, subdomain 2
711 772 Pfam PF13342 C-terminal repeat of topoisomerase
711 772 InterPro IPR025589 Topoisomerase C-terminal repeat
1 136 ProSiteProfiles PS50880 Toprim domain profile.
1 136 InterPro IPR006171 TOPRIM domain

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
0.936
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Surrounding area
Pocket 2 P2Rank #2
0.729
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Surrounding area
Pocket 3 P2Rank #3
0.305
Likely same site as FPocket 35 1.8 Å 14 shared residues 93% of smaller site
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Surrounding area
Pocket 4 P2Rank #4
0.187
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Surrounding area
Pocket 5 P2Rank #5
0.09
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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 #35
0.564
Likely same site as P2Rank 3 1.8 Å 14 shared residues 93% of smaller site
Show in viewer
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_A0A1C8Y8K9
AlphaFold DB full sequence Viewing
ColabFold KP13_06748
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.