KpATCC43816 Protein target profile

DNA ligase

Accession: VK055_3473

Gene: ligB AIK82029.1 3D evidence: AlphaFold DB model + ColabFold model Metabolism 1 reaction UniProt A0A0H3H4K3
Length 558
Pocket druggability (P2Rank · AlphaFold DB model) 0.752
Metabolic reactions 1
Chokepoint Yes
Direct ligand evidence 0 58 total records
Functional annotation 1 EC 4 GO
Target summary

Strong target candidate with converging metabolic, structural and chemical evidence.

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
No hit
Gut microbiome similarity
1.3% of screened genomes Lower prevalence suggests narrower overlap with the screened gut microbiome.

Essentiality

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

Structure confidence

ColabFold pLDDT
90.96 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) 0.752
Structure A0A0H3H4K3
Pocket Pocket 1
Druggability (FPocket) 0.836
Structure A0A0H3H4K3
Pocket Pocket 1
ColabFold model
P2Rank 0.748 · Pocket 1
FPocket 0.862 · Pocket 1
Core conservation Conserved core gene
Roary core
CoreCruncher core
Gut microbiome 61 / 4744 genomes with a hit
Prevalence 1.3%

Metabolic context

Reactions catalyzed, pathway membership, and centrality in the genome-scale metabolic network.

Explore metabolic network

Attractive metabolic target: catalyzes a producing & consuming chokepoint reaction, no human homolog detected.

Relative network centrality 0.0% more central than 0.0% of genes in this genome
Chokepoint Chokepoint gene
Pathways

No specific KEGG pathway assigned - this reaction either has no KEGG mapping, or only matches a generic overview map with no route-level information.

Catalyzed reaction

1 reaction mapped to this gene in the metabolic model. Open the full network to see each one, with substrates/products and the reaction-reaction map.

Imported from KpATCC43816.sbml · 2026-07-09

Sequence

Primary amino-acid sequence viewer.

MRKGGWWLALGMFSASALATCPDWPPARGRQETSRLHQQIVAWKEAYWRQGASGVSDDVYDQLTLRLAQWRQCFPGATPEDDDLPPPTGDARHPVAHTGVRKLADEDSVARWMKNKSDLWIQPKVDGVAVTLVYRQGRLVQAISRGDGLRGEAWTARARQIPALAKVMTGELADSVLQGELFLRRDGHVQQQAGGMNARAKVAGLMMRADAAAALSQLDVFIWAWPDGPSDMRRRQKLLAQAGFKYSGQYTHPVSRIEQVAQWRQRWYRSPLPFVSDGVIVREGREPPGRVWSPGKGEWLAAWKYPPASRVMQVRAIRFSTGRSGRLNVVAELEPQRLDDKRVQRVNVGSVSRWQMLDIGVGDQLQISLAGQGIPRVDAVVWRTAERHKPTPPPAKFNALTCYFATPECSEQFLSRLIWLSSKSALNVDGVGENLWRVIQQQNPMTHIFSWLALTVEQLQAVPGISAARGQHLWHQFDLVRKRPFIRWVLAMGIPVPQGALAQLESENWHLLAAKSEAQWRTLPGVGEIRARQLVAFLHHPDVVALAQWLSGQRIPGF

Functional annotations

Enzyme classification and Gene Ontology terms linked to this protein.

1 EC 4 GO

Subcellular localization

Localization
CytoplasmicMembrane

Enzyme Commission (EC)

1

Gene Ontology (GO)

4
  • GO:0006260 The cellular metabolic process in which a cell duplicates one or more molecules of DNA. DNA replication begins when specific sequences, known as origins of replication, are recognized and bound by the origin recognition complex, and ends when the original DNA molecule has been completely duplicated and the copies topologically separated. The unit of replication usually corresponds to the genome of the cell, an organelle, or a virus. The template for replication can either be an existing DNA molecule or RNA.
  • GO:0003911 Catalysis of the reaction: NAD+ + deoxyribonucleotide(n) + deoxyribonucleotide(m) = AMP + nicotinamide nucleotide + deoxyribonucleotide(n+m).
  • 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.
  • GO:0006259 Any cellular metabolic process involving deoxyribonucleic acid. This is one of the two main types of nucleic acid, consisting of a long, unbranched macromolecule formed from one, or more commonly, two, strands of linked deoxyribonucleotides.

Sequence domains and features

Domain and signature matches imported from InterPro and related databases.

24 records
Show feature table
Start End DB Term Name
1 19 SignalP_GRAM_NEGATIVE SignalP-noTM SignalP-noTM
26 84 Gene3D G3DSA:1.10.287.610 Helix hairpin bin
313 387 Pfam PF03120 NAD-dependent DNA ligase OB-fold domain
313 387 InterPro IPR004150 NAD-dependent DNA ligase, OB-fold
15 19 Phobius SIGNAL_PEPTIDE_C_REGION C-terminal region of a signal peptide.
311 388 SUPERFAMILY SSF50249 Nucleic acid-binding proteins
311 388 InterPro IPR012340 Nucleic acid-binding, OB-fold
1 19 Phobius SIGNAL_PEPTIDE Signal peptide region
400 550 SUPERFAMILY SSF47781 RuvA domain 2-like
400 550 InterPro IPR010994 RuvA domain 2-like
28 425 SMART SM00532 ligaN3
28 425 InterPro IPR013840 NAD-dependent DNA ligase, N-terminal
17 382 PANTHER PTHR47810 DNA LIGASE
111 282 Pfam PF01653 NAD-dependent DNA ligase adenylation domain
111 282 InterPro IPR013839 NAD-dependent DNA ligase, adenylation
6 558 Hamap MF_01587 DNA ligase B [ligB].
6 558 InterPro IPR020923 DNA ligase B
20 558 Phobius NON_CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the extracellular region.
4 14 Phobius SIGNAL_PEPTIDE_H_REGION Hydrophobic region of a signal peptide.
310 394 Gene3D G3DSA:2.40.50.140 -
310 394 InterPro IPR012340 Nucleic acid-binding, OB-fold
24 306 SUPERFAMILY SSF56091 DNA ligase/mRNA capping enzyme, catalytic domain
1 3 Phobius SIGNAL_PEPTIDE_N_REGION N-terminal region of a signal peptide.
89 308 Gene3D G3DSA:3.30.470.30 DNA ligase/mRNA capping enzyme

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
0.752
Likely same site as FPocket 25 4.9 Å 9 shared residues 100% of smaller site
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Surrounding area
Pocket 2 P2Rank #2
0.688
Likely same site as FPocket 1 4.3 Å 15 shared residues 94% of smaller site
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Surrounding area
Pocket 3 P2Rank #3
0.534
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Surrounding area
Pocket 4 P2Rank #4
0.079
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Surrounding area
Pocket 5 P2Rank #5
0.027
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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
0.836 Unusual size
Likely same site as P2Rank 2 4.3 Å 15 shared residues 94% of smaller site
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Surrounding area
Pocket 2 FPocket #25
0.367
Likely same site as P2Rank 1 4.9 Å 9 shared residues 100% of smaller site
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Surrounding area
Residue sets
UniProt: Active site:124-124 N6-AMP-lysine intermediate
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_A0A0H3H4K3
AlphaFold DB full sequence Viewing
ColabFold VK055_3473
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.

58 records
Chemistry signal

Structural and bioactivity evidence are both available for this target.

Direct evidence 0 same-protein records
Transferred evidence 8 records from similar proteins
Structural ligands 7 0 loaded crystals
Measured bioactivity 1 direct and transferred ChEMBL records
Proposed compounds 50 similarity-based ZINC candidates
Best available ligand signal
0XS PDB via homolog 335.1 Da · LogP 2.09 · TPSA 94.9 Open detail RCSB PDB
0XT PDB via homolog Detail RCSB PDB
1X7 PDB via homolog Detail RCSB PDB
1X8 PDB via homolog Detail RCSB PDB
IVH PDB via homolog Detail RCSB PDB

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
0XS RCSB PDB P15042 335.1 Da LogP 2.09 TPSA 94.9 ✓ Ro5 ✓ Clean c1c2cc(c(nc2nc(c1C(=O)N)N)C(F)(F)F)Br
0XT RCSB PDB C1CKI0 206.2 Da LogP -0.10 TPSA 112.8 ✓ Ro5 ✓ Clean Cc1c(nc2c(n1)c(nc(n2)N)N)OC
1X7 RCSB PDB Q837V6 272.1 Da LogP 1.74 TPSA 82.0 ✓ Ro5 ✓ Clean c1c2c(c(cnc2N)C(=O)N)sc1Br
1X8 RCSB PDB Q837V6 236.3 Da LogP 0.08 TPSA 125.1 ✓ Ro5 ✓ Clean c1c2c(c(cnc2N)C(=O)N)sc1C(=O)N
IVH RCSB PDB P43813 355.4 Da LogP -0.09 TPSA 139.5 ✓ Ro5 ✓ Clean CCCCSc1nc(c2c(n1)n(cn2)[C@H]3[C@@H]([C@@H]([C@H…
IWH RCSB PDB P43813 256.3 Da LogP 1.61 TPSA 65.1 ✓ Ro5 ✓ Clean Cc1ccc(c(c1)C)CN2C=C(C=CC2=O)C(=O)N
NMN RCSB PDB Q837V6 335.2 Da LogP -2.20 TPSA 163.4 ✓ Ro5 ✓ Clean c1cc(c[n+](c1)[C@H]2[C@@H]([C@@H]([C@H](O2)COP(…

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.