KpATCC43816 Protein target profile

2-isopropylmalate synthase

Accession: VK055_2493

Gene: leuA AIK81090.1 3D evidence: AlphaFold DB model + ColabFold model Metabolism 1 reaction UniProt A0A0H3GJ80
Length 523
Pocket druggability (P2Rank · AlphaFold DB model) 0.777
Metabolic reactions 1
Chokepoint No
Direct ligand evidence 0 57 total records
Functional annotation 1 EC 8 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 (%)
25.0 Lower values reduce human off-target concern.
Human E-value
5.45e-07
Gut microbiome similarity
7.3% of screened genomes Lower prevalence suggests narrower overlap with the screened gut microbiome.

Essentiality

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

Structure confidence

ColabFold pLDDT
88.55 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) 0.777
Structure A0A0H3GJ80
Pocket Pocket 1
Druggability (FPocket) 0.206
Structure A0A0H3GJ80
Pocket Pocket 38
ColabFold model
P2Rank 0.697 · Pocket 1
FPocket 0.285 · Pocket 3
Core conservation Conserved core gene
Roary core
CoreCruncher core
Gut microbiome 344 / 4744 genomes with a hit
Prevalence 7.3%

Metabolic context

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

Explore metabolic network

Metabolic context: more central than 96.1% of genes in this genome.

Relative network centrality 96.1% more central than 96.1% of genes in this genome
Chokepoint Not a chokepoint
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.

MSQQVIIFDTTLRDGEQALQASLSVKEKLQIALALERMGVDVMEVGFPVSSPGDFESVQTIARTIKNSRVCALARCVEKDIDVAAESLKVAEAFRIHTFIATSPMHIATKLRSTLDEVIERAIYMVKRARNYTDDVEFSCEDAGRTPIADLARVVEAAINAGATTINIPDTVGYTMPFEYANIISGLYDRVPNIDKAIISVHTHDDLGIAVGNALAAVHAGARQVEGAMNGIGERAGNCALEEVIMAIKVRKDIMNVHTNINHHEIWRTSQTVSQICNMPIPANKAIVGTGAFAHSSGIHQDGVLKNRENYEIMTPESIGLNQVQLNLTSRSGRAAVKHRMEEMGYQESDYNLDHLYDAFLKLADKKGQVFDYDLEALAFINKQQEEPEHFRLDYFNVQSGSSDIATASIKLVCGDEIKTEAANGNGPVDAIYQAINRVTDYNIELVKYGLSAKGHGKDALGQVDIVVDYNGRRFHGVGLATDIVESSAKAMVHVLNNIWRAAEVEKELQRKAQNKENNKETV

Functional annotations

Enzyme classification and Gene Ontology terms linked to this protein.

1 EC 8 GO

Subcellular localization

Localization
Cytoplasmic

Enzyme Commission (EC)

1

Gene Ontology (GO)

8
  • GO:0003824 Catalysis of a biochemical reaction at physiological temperatures. In biologically catalyzed reactions, the reactants are known as substrates, and the catalysts are naturally occurring macromolecular substances known as enzymes. Enzymes possess specific binding sites for substrates, and are usually composed wholly or largely of protein, but RNA that has catalytic activity (ribozyme) is often also regarded as enzymatic.
  • GO:0003852 Catalysis of the reaction: 3-methyl-2-oxobutanoate + acetyl-CoA + H2O = (2S)-2-isopropylmalate + CoA + H+.
  • GO:0009098 The chemical reactions and pathways resulting in the formation of L-leucine, 2-amino-4-methylpentanoic acid.
  • GO:0019752 The chemical reactions and pathways involving carboxylic acids, any organic acid containing one or more carboxyl (COOH) groups or anions (COO-).
  • GO:0046912 Catalysis of the transfer of an acyl group from one compound (donor) to another (acceptor), with the acyl group being converted into alkyl on transfer.
  • GO:0005829 The part of the cytoplasm that does not contain organelles but which does contain other particulate matter, such as protein complexes.
  • GO:0003985 Catalysis of the reaction: 2 acetyl-CoA = CoA + acetoacetyl-CoA.
  • GO:0030145 Binding to a manganese ion (Mn).

Sequence domains and features

Domain and signature matches imported from InterPro and related databases.

30 records
Show feature table
Start End DB Term Name
502 523 Coils Coil Coil
280 392 Gene3D G3DSA:1.10.238.260 -
4 273 Pfam PF00682 HMGL-like
4 273 InterPro IPR000891 Pyruvate carboxyltransferase
1 279 Gene3D G3DSA:3.20.20.70 Aldolase class I
1 279 InterPro IPR013785 Aldolase-type TIM barrel
394 500 FunFam G3DSA:3.30.160.270:FF:000001 2-isopropylmalate synthase
1 290 SUPERFAMILY SSF51569 Aldolase
2 509 Hamap MF_01025 2-isopropylmalate synthase [leuA].
2 509 InterPro IPR005671 2-isopropylmalate synthase, bacterial-type
1 279 FunFam G3DSA:3.20.20.70:FF:000010 2-isopropylmalate synthase
12 28 ProSitePatterns PS00815 Alpha-isopropylmalate and homocitrate synthases signature 1.
12 28 InterPro IPR002034 Alpha-isopropylmalate/homocitrate synthase, conserved site
7 275 CDD cd07940 DRE_TIM_IPMS
393 501 Gene3D G3DSA:3.30.160.270 -
393 501 InterPro IPR036230 2-isopropylmalate synthase LeuA, allosteric (dimerisation) domain superfamily
3 501 PANTHER PTHR10277 HOMOCITRATE SYNTHASE-RELATED
199 212 ProSitePatterns PS00816 Alpha-isopropylmalate and homocitrate synthases signature 2.
199 212 InterPro IPR002034 Alpha-isopropylmalate/homocitrate synthase, conserved site
280 393 FunFam G3DSA:1.10.238.260:FF:000001 2-isopropylmalate synthase
391 499 SUPERFAMILY SSF110921 2-isopropylmalate synthase LeuA, allosteric (dimerisation) domain
391 499 InterPro IPR036230 2-isopropylmalate synthase LeuA, allosteric (dimerisation) domain superfamily
5 267 ProSiteProfiles PS50991 Pyruvate carboxyltransferase domain.
5 267 InterPro IPR000891 Pyruvate carboxyltransferase
369 499 Pfam PF08502 LeuA allosteric (dimerisation) domain
369 499 InterPro IPR013709 2-isopropylmalate synthase LeuA, allosteric (dimerisation) domain
369 500 SMART SM00917 LeuA_dimer_2
369 500 InterPro IPR013709 2-isopropylmalate synthase LeuA, allosteric (dimerisation) domain
4 497 NCBIfam TIGR00973 2-isopropylmalate synthase
4 497 InterPro IPR005671 2-isopropylmalate synthase, bacterial-type

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
0.777
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Surrounding area
Pocket 2 P2Rank #2
0.266
Likely same site as FPocket 38 3.7 Å 15 shared residues 88% of smaller site
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Surrounding area
Pocket 3 P2Rank #3
0.103
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Surrounding area
Pocket 4 P2Rank #4
0.087
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Surrounding area
Pocket 5 P2Rank #5
0.064
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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 #38
0.206 Unusual size
Likely same site as P2Rank 2 3.7 Å 15 shared residues 88% of smaller site
Show in viewer
Surrounding area
Residue sets
UniProt: Binding site:14-14
UniProt: Binding site:202-202
UniProt: Binding site:204-204
UniProt: Binding site:238-238
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_A0A0H3GJ80
AlphaFold DB full sequence Viewing
ColabFold VK055_2493
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.

57 records
Chemistry signal

Structural ligand evidence is available for this target.

Direct evidence 0 same-protein records
Transferred evidence 7 records from similar proteins
Structural ligands 7 0 loaded crystals
Measured bioactivity 0 direct and transferred ChEMBL records
Proposed compounds 50 similarity-based ZINC candidates
Best available ligand signal
AKG PDB via homolog 146.1 Da · LogP -0.50 · TPSA 91.7 Open detail RCSB PDB
HCA PDB via homolog Detail RCSB PDB
KIV PDB via homolog Detail RCSB PDB
KMT PDB via homolog Detail RCSB PDB
MLI 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
AKG RCSB PDB O87198 146.1 Da LogP -0.50 TPSA 91.7 ✓ Ro5 ✓ Clean C(CC(=O)O)C(=O)C(=O)O
HCA RCSB PDB O87198 206.1 Da LogP -0.86 TPSA 132.1 ✓ Ro5 ✓ Clean C(C[C@@](CC(=O)O)(C(=O)O)O)C(=O)O
KIV RCSB PDB B0SN40 116.1 Da LogP 0.30 TPSA 54.4 ✓ Ro5 ✓ Clean CC(C)C(=O)C(=O)O
KMT RCSB PDB C5J4P1 148.2 Da LogP 0.39 TPSA 54.4 ✓ Ro5 ✓ Clean CSCCC(=O)C(=O)O
MLI RCSB PDB Q8F3Q1 102.0 Da LogP -3.12 TPSA 80.3 ✓ Ro5 ✓ Clean C(C(=O)[O-])C(=O)[O-]
PYR RCSB PDB Q8F3Q1 88.1 Da LogP -0.34 TPSA 54.4 ✓ Ro5 ✓ Clean CC(=O)C(=O)O
VPM RCSB PDB B0SN40 176.2 Da LogP -0.07 TPSA 94.8 ✓ Ro5 ✓ Clean CC(C)[C@@](CC(=O)O)(C(=O)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.

Cross-references

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