Protein target profile

VK055_2233

D-alanine-D-alanine ligase A

Genome: KpATCC43816 Gene: AIK80838.1 3D evidence: Experimental + ColabFold model Metabolism 1 reaction UniProt A0A0H3GSI5
Length 365
Pocket druggability 0.627
Metabolic reactions 1
Chokepoint Yes
Direct ligand evidence 0 54 total records
Functional annotation 1 EC 8 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
2.6% of screened genomes Lower prevalence suggests narrower overlap with the screened gut microbiome.

Essentiality

Essential (DEG)
Y
DEG identity (%)
44.78 Higher values support similarity to known essential genes.
DEG E-value
8.33e-100 Smaller values mean stronger essential-gene similarity.

Localization

Localization
Cytoplasmic

Structure confidence

ColabFold pLDDT
94.12 0-100 confidence; >70 supports local structural interpretation.

Binding-site evidence

PDB experimental structure

The selected pocket score is the FPocket value used for ranking after applying the curated structure priority. It estimates small-molecule pocket quality; it is not experimental binding evidence. The 3D viewer may show a different loaded structure, so visible pockets can differ.

FPocket 0.627
Structure 7U56
Pocket Pocket 5
P2Rank 0.31
Structure 7U56
Pocket Pocket 1
ColabFold model
FPocket 0.573 · Pocket 4
P2Rank 0.985 · Pocket 1
Core conservation Conserved core gene
Roary core
CoreCruncher core
Gut microbiome 122 / 4744 genomes with a hit
Prevalence 2.6%

Cross-references

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

Structure

Metabolic context

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

Explore metabolic network

Attractive metabolic target: catalyzes a producing chokepoint reaction in D-Amino acid metabolism, no isoenzyme backup detected, more central than 94.2% of genes in this genome, no human homolog detected.

Relative network centrality 94.2% more central than 94.2% of genes in this genome
Chokepoint Chokepoint gene
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.

MAKMRVGIVFGGKSAEHEVSLQSAKNIVEAIDKSRFDVVLLGIDKQGLWHINDAGNYLLNAQDPARIALRPSTVTLAQIPGREAQQLINAESGQPLAAIDVIFPIVHGTLGEDGSLQGMLRMANLPFVGSDVLGSAACMDKDVTKRLLRDAGLAVAPFITLTRANRAQFSFADVEAKLGLPLFVKPANQGSSVGVSKVKNEEQYHQAVALAFEFDHKVVVEQGIKGREIECAVLGNDHPQASTCGEIVLNSEFYAYDTKYIDDQGAQVVVPAAIAPEINDKIRAIAVQAYQTLGCSGMARVDVFLTADNEVVINEINTLPGFTNISMYPKLWQASGLDYTSLITRLIELALERHAADRALKTSMN

Functional annotations

Enzyme classification and Gene Ontology terms linked to this protein.

1 EC 8 GO

Enzyme Commission (EC)

1

Gene Ontology (GO)

8
  • GO:0008716 Catalysis of the reaction: 2 D-alanine + ATP = D-alanyl-D-alanine + ADP + 2 H+ + phosphate.
  • GO:0005524 Binding to ATP, adenosine 5'-triphosphate, a universally important coenzyme and enzyme regulator.
  • GO:0005737 The contents of a cell excluding the plasma membrane and nucleus, but including other subcellular structures.
  • GO:0046872 Binding to a metal ion.
  • GO:0005829 The part of the cytoplasm that does not contain organelles but which does contain other particulate matter, such as protein complexes.
  • GO:0071555 A process that results in the assembly, arrangement of constituent parts, or disassembly of the cell wall, the rigid or semi-rigid envelope lying outside the cell membrane of plant, fungal and most prokaryotic cells, maintaining their shape and protecting them from osmotic lysis.
  • GO:0009252 The chemical reactions and pathways resulting in the formation of peptidoglycans, any of a class of glycoconjugates found in bacterial cell walls and consisting of long glycan strands of alternating residues of beta-(1,4) linked N-acetylglucosamine and N-acetylmuramic acid, cross-linked by short peptides.
  • GO:0008360 Any process that modulates the surface configuration of a cell.

Sequence domains and features

Domain and signature matches imported from InterPro and related databases.

27 records
Show feature table
Start End DB Term Name
1 128 FunFam G3DSA:3.40.50.20:FF:000015 D-alanine--D-alanine ligase
129 353 Gene3D G3DSA:3.30.470.20 -
191 347 FunFam G3DSA:3.30.470.20:FF:000008 D-alanine--D-alanine ligase
155 224 FunFam G3DSA:3.30.1490.20:FF:000007 D-alanine--D-alanine ligase
147 348 Pfam PF07478 D-ala D-ala ligase C-terminus
147 348 InterPro IPR011095 D-alanine--D-alanine ligase, C-terminal
4 351 Hamap MF_00047 D-alanine--D-alanine ligase [ddl].
4 351 InterPro IPR005905 D-alanine--D-alanine ligase
293 321 ProSitePatterns PS00844 D-alanine--D-alanine ligase signature 2.
293 321 InterPro IPR000291 D-alanine--D-alanine ligase/VANA/B/C, conserved site
2 364 PANTHER PTHR23132 D-ALANINE--D-ALANINE LIGASE
155 224 Gene3D G3DSA:3.30.1490.20 -
155 224 InterPro IPR013815 ATP-grasp fold, subdomain 1
145 348 ProSiteProfiles PS50975 ATP-grasp fold profile.
145 348 InterPro IPR011761 ATP-grasp fold
5 350 NCBIfam TIGR01205 D-alanine--D-alanine ligase
5 350 InterPro IPR005905 D-alanine--D-alanine ligase
140 354 SUPERFAMILY SSF56059 Glutathione synthetase ATP-binding domain-like
3 139 SUPERFAMILY SSF52440 PreATP-grasp domain
3 139 InterPro IPR016185 Pre-ATP-grasp domain superfamily
107 118 ProSitePatterns PS00843 D-alanine--D-alanine ligase signature 1.
107 118 InterPro IPR000291 D-alanine--D-alanine ligase/VANA/B/C, conserved site
1 128 Gene3D G3DSA:3.40.50.20 -
1 359 PIRSF PIRSF039102 Ddl/VanB
1 359 InterPro IPR005905 D-alanine--D-alanine ligase
5 130 Pfam PF01820 D-ala D-ala ligase N-terminus
5 130 InterPro IPR011127 D-alanine--D-alanine ligase, N-terminal 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 · FPocket

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

Site 1 FPocket #5
0.627
Likely same site as P2Rank 3 2.0 Å 12 shared residues 100% of smaller site
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Surrounding area

Binding pockets · P2Rank

Probability: high ≥ 0.5 · medium 0.2–0.49 · low < 0.2

Site 1 P2Rank #1
0.31
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Surrounding area
Site 2 P2Rank #2
0.177
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Surrounding area
Site 3 P2Rank #3
0.172
Likely same site as FPocket 5 2.0 Å 12 shared residues 100% of smaller site
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Surrounding area
Site 4 P2Rank #4
0.113
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Surrounding area
Site 5 P2Rank #5
0.062
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Surrounding area
All structural evidence 1 experimental · 1 predicted

Structural evidence

1 + 1

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
PDB 7U56
X-ray 1.85 Å A,B
100.0% 1-365
Viewing
ColabFold VK055_2233
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.

54 records
Chemistry signal

Structural ligand evidence is available for this target.

Direct evidence 0 same-protein records
Transferred evidence 4 records from similar proteins
Structural ligands 4 0 loaded crystals
Measured bioactivity 0 direct and transferred ChEMBL records
Proposed compounds 50 similarity-based ZINC candidates
Best available ligand signal
ANP PDB via homolog 506.2 Da · LogP -2.06 · TPSA 281.9 Open detail RCSB PDB
DS0 PDB via homolog Detail RCSB PDB
G1L PDB via homolog Detail RCSB PDB
PHY PDB via homolog Detail RCSB PDB
ZINC12360002 ZINC proposed compound · Tanimoto 0.810 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
ANP RCSB PDB Q5H614 506.2 Da LogP -2.06 TPSA 281.9 3 viol. ✓ Clean c1nc(c2c(n1)n(cn2)[C@H]3[C@@H]([C@@H]([C@H](O3)…
DS0 RCSB PDB Q5SHZ3 182.1 Da LogP -1.23 TPSA 114.4 ✓ Ro5 ✓ Clean C1[C@H](C(=NO1)OP(=O)(O)O)N
G1L RCSB PDB Q5HEB7 279.7 Da LogP 3.91 TPSA 29.1 ✓ Ro5 ✓ Clean CC(C)(CCl)C(=O)Nc1ccc(cc1)C(F)(F)F
PHY RCSB PDB P25051 275.1 Da LogP 0.40 TPSA 147.2 ✓ Ro5 ✓ Clean C[C@@H](C[P@](=O)([C@@H](C)N)OP(=O)(O)O)C(=O)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.