Protein target profile

KP13_00081

Acetolactate synthase isozyme 1 large subunit

Genome: KpKP13 Gene: ilvB AHE42006.1 3D evidence: AlphaFold DB model + ColabFold model UniProt A0A0H3GXN5
Length 552
Pocket druggability 0.998
Direct ligand evidence 0 108 total records
Functional annotation 1 EC 9 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 (%)
34.286 Lower values reduce human off-target concern.
Human E-value
3.06e-12
Gut microbiome similarity
2.1% of screened genomes Lower prevalence suggests narrower overlap with the screened gut microbiome.

Essentiality

Essential (DEG)
Y
DEG identity (%)
45.614 Higher values support similarity to known essential genes.
DEG E-value
6.81e-168 Smaller values mean stronger essential-gene similarity.

Localization

Localization
Cytoplasmic

Structure confidence

ColabFold pLDDT
96.99 0-100 confidence; >70 supports local structural interpretation.

Binding-site evidence

AlphaFold DB / UniProt model

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 0.998
Structure A0A0H3GXN5
Pocket Pocket 5
P2Rank 0.939
Structure A0A0H3GXN5
Pocket Pocket 1
ColabFold model
FPocket 0.901 · Pocket 4
P2Rank 0.94 · Pocket 1
Core conservation Conserved core gene
Roary core
CoreCruncher core
Gut microbiome 98 / 4744 genomes with a hit
Prevalence 2.1%

Cross-references

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

Sequence

Primary amino-acid sequence viewer.

MRFTGAQLVVHLLERQGITMVSGIPGGSILPIYDALSQSTQIRHILARHEQGAGFIAQGMARTEGKPAVCMACSGPGATNLVTAIADARLDSIPLVCITGQVPASMIGTDAFQEVDTYGISIPITKHNYLVRDIAELPQVISDAFRIAQSGRPGPVWIDIPKDVQSATIELEALPEPGERAPAPAFAPESVREAAAMINAAKRPVLYLGGGVINAPQAIRELAEKANLPTTMTLMALGMLPKAHPLSLGMLGMHGARSTNFILQEADLLIVLGARFDDRAIGKTEQFCPNAKIIHVDIDRAELGKIKQPHVAIQGDVAEVLAQLNPQIEAQPREEWRQLVADLQREFPCAIPQESDPLSHYGLINAVAACVDDEAIITTDVGQHQMWTAQAYPLNRPRQWLTSGGLGTMGFGLPAAIGAALANPQRKVICFSGDGSLMMNIQEMATAAENQLDVKIILLNNEALGLVHQQQSLFYQQGVFAATYPGMINFMQIAAGFGLQTCDLNNEVDPQAALQAIIDRPGPALIHVRIDAQQKVYPMVPPGAANTEMVGE

Functional annotations

Enzyme classification and Gene Ontology terms linked to this protein.

1 EC 9 GO

Enzyme Commission (EC)

1

Gene Ontology (GO)

9
  • GO:0030976 Binding to thiamine pyrophosphate, the diphosphoric ester of thiamine. Acts as a coenzyme of several (de)carboxylases, transketolases, and alpha-oxoacid dehydrogenases.
  • GO:0003984 Catalysis of the reaction: H+ + 2 pyruvate = (2S)-2-acetolactate + CO2. Can also convert 2-oxobutanoate and pyruvate to (S)-2-ethyl-2-hydroxy-3-oxobutanoate.
  • GO:0000287 Binding to a magnesium (Mg) ion.
  • 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:0050660 Binding to FAD, flavin-adenine dinucleotide, the coenzyme or the prosthetic group of various flavoprotein oxidoreductase enzymes, in either the oxidized form, FAD, or the reduced form, FADH2.
  • GO:0009082 The chemical reactions and pathways resulting in the formation of amino acids containing a branched carbon skeleton, comprising isoleucine, leucine and valine.
  • GO:0005948 A dimeric (a large and a small chain) or tetrameric (two large and two small chains) enzyme complex. Catalyzes the formation of acetolactate from pyruvate.
  • GO:0009097 OBSOLETE. The chemical reactions and pathways resulting in the formation of isoleucine, (2R*,3R*)-2-amino-3-methylpentanoic acid.
  • GO:0009099 The chemical reactions and pathways resulting in the formation of valine, 2-amino-3-methylbutanoic acid.

Sequence domains and features

Domain and signature matches imported from InterPro and related databases.

27 records
Show feature table
Start End DB Term Name
1 177 Gene3D G3DSA:3.40.50.970 -
4 544 PANTHER PTHR18968 THIAMINE PYROPHOSPHATE ENZYMES
4 544 InterPro IPR045229 Thiamine pyrophosphate enzyme
358 543 CDD cd02015 TPP_AHAS
358 543 InterPro IPR039368 Acetolactate synthase large subunit, TPP binding domain
417 436 ProSitePatterns PS00187 Thiamine pyrophosphate enzymes signature.
417 436 InterPro IPR000399 TPP-binding enzyme, conserved site
4 551 NCBIfam TIGR00118 biosynthetic-type acetolactate synthase large subunit
4 551 InterPro IPR012846 Acetolactate synthase, large subunit, biosynthetic
380 528 Pfam PF02775 Thiamine pyrophosphate enzyme, C-terminal TPP binding domain
380 528 InterPro IPR011766 Thiamine pyrophosphate enzyme, TPP-binding
191 324 Pfam PF00205 Thiamine pyrophosphate enzyme, central domain
191 324 InterPro IPR012000 Thiamine pyrophosphate enzyme, central domain
2 177 SUPERFAMILY SSF52518 Thiamin diphosphate-binding fold (THDP-binding)
2 177 InterPro IPR029061 Thiamin diphosphate-binding fold
1 182 FunFam G3DSA:3.40.50.970:FF:000007 Acetolactate synthase
356 550 SUPERFAMILY SSF52518 Thiamin diphosphate-binding fold (THDP-binding)
356 550 InterPro IPR029061 Thiamin diphosphate-binding fold
357 551 FunFam G3DSA:3.40.50.970:FF:000016 Acetolactate synthase
4 170 Pfam PF02776 Thiamine pyrophosphate enzyme, N-terminal TPP binding domain
4 170 InterPro IPR012001 Thiamine pyrophosphate enzyme, N-terminal TPP-binding domain
155 351 SUPERFAMILY SSF52467 DHS-like NAD/FAD-binding domain
155 351 InterPro IPR029035 DHS-like NAD/FAD-binding domain superfamily
184 349 FunFam G3DSA:3.40.50.1220:FF:000008 Acetolactate synthase
356 551 Gene3D G3DSA:3.40.50.970 -
7 162 CDD cd07035 TPP_PYR_POX_like
186 355 Gene3D G3DSA:3.40.50.1220 -

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
0.998
Likely same site as P2Rank 1 1.1 Å 42 shared residues 95% of smaller site
Unusual size
Show in viewer
Surrounding area
Site 2 FPocket #30
0.798
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Surrounding area
Site 3 FPocket #29
0.395
Likely same site as P2Rank 2 1.2 Å 16 shared residues 94% of smaller site
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Surrounding area
Site 4 FPocket #13
0.245
Likely same site as P2Rank 3 0.3 Å 15 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
0.939
Likely same site as FPocket 5 1.1 Å 42 shared residues 95% of smaller site
Show in viewer
Surrounding area
Site 2 P2Rank #2
0.407
Likely same site as FPocket 29 1.2 Å 16 shared residues 94% of smaller site
Show in viewer
Surrounding area
Site 3 P2Rank #3
0.388
Likely same site as FPocket 13 0.3 Å 15 shared residues 100% of smaller site
Show in viewer
Surrounding area
Site 4 P2Rank #4
0.017
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Surrounding area
Site 5 P2Rank #5
0.006
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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_A0A0H3GXN5
AlphaFold DB full sequence Viewing
ColabFold KP13_00081
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.

108 records
Chemistry signal

Structural and bioactivity evidence are both available for this target.

Direct evidence 0 same-protein records
Transferred evidence 58 records from similar proteins
Structural ligands 22 0 loaded crystals
Measured bioactivity 36 direct and transferred ChEMBL records
Proposed compounds 50 similarity-based ZINC candidates
Best available ligand signal
1IQ PDB via homolog 311.3 Da · LogP 2.22 · TPSA 91.7 Open detail RCSB PDB
1MM PDB via homolog Detail RCSB PDB
1MS PDB via homolog Detail RCSB PDB
1SM PDB via homolog Detail RCSB PDB
2SM 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
1IQ RCSB PDB P17597 311.3 Da LogP 2.22 TPSA 91.7 ✓ Ro5 ✓ Clean CC(C)[C@@]1(C(=O)NC(=N1)c2c(cc3ccccc3n2)C(=O)O)C
1MM RCSB PDB P17597 381.4 Da LogP 0.49 TPSA 149.5 ✓ Ro5 ✓ Clean Cc1nc(nc(n1)OC)NC(=O)NS(=O)(=O)c2ccccc2C(=O)OC
1MS RCSB PDB P17597 337.3 Da LogP 1.20 TPSA 144.2 ✓ Ro5 ✓ Clean Cc1ccnc(n1)NC(=O)NS(=O)(=O)c2ccccc2[N+](=O)[O-]
1SM RCSB PDB A0A1D8PJF9 364.4 Da LogP 1.39 TPSA 127.3 ✓ Ro5 ✓ Clean Cc1cc(nc(n1)NC(=O)NS(=O)(=O)c2ccccc2C(=O)OC)C
2SM RCSB PDB P17597 350.4 Da LogP 1.08 TPSA 127.3 ✓ Ro5 ✓ Clean Cc1ccnc(n1)NC(=O)NS(=O)(=O)c2ccccc2C(=O)OC
60G RCSB PDB A0A1D8PJF9 410.4 Da LogP 0.93 TPSA 145.8 ✓ Ro5 ✓ Clean COc1cc(nc(n1)NC(=O)NS(=O)(=O)Cc2ccccc2C(=O)OC)OC
6QK RCSB PDB P17597 326.8 Da LogP 3.00 TPSA 81.5 ✓ Ro5 ✓ Clean COc1cc(nc(n1)Sc2cccc(c2C(=O)O)Cl)OC
6QL RCSB PDB P17597 430.4 Da LogP 2.58 TPSA 144.2 1 viol. ✓ Clean COc1cc(nc(n1)Oc2cccc(c2C(=O)O)Oc3nc(cc(n3)OC)OC…
6R4 RCSB PDB A0A1D8PJF9 398.4 Da LogP 0.10 TPSA 138.6 ✓ Ro5 ✓ Clean CCCOC1=NN(C(=O)N1C)C(=O)NS(=O)(=O)c2ccccc2C(=O)…
6R5 RCSB PDB P17597 390.4 Da LogP -0.31 TPSA 138.6 1 viol. ✓ Clean Cc1c(c(cs1)C(=O)OC)S(=O)(=O)NC(=O)N2C(=O)N(C(=N…
CO2 RCSB PDB A0A1D8PJF9 44.0 Da LogP -0.58 TPSA 34.1 ✓ Ro5 ✓ Clean C(=O)=O
F50 RCSB PDB P17597 76.1 Da LogP 0.02 TPSA 46.5 ✓ Ro5 ✓ Clean CC(=O)OO
FAB RCSB PDB P17597 855.6 Da LogP -2.87 TPSA 373.8 3 viol. Alert Cc1cc2c(cc1C)[N+](=C3C(=O)NC(=O)N=C3N2C[C@@H]([…
G87 RCSB PDB A0A1D8PJF9 418.3 Da LogP 2.56 TPSA 107.7 ✓ Ro5 ✓ Clean Cc1ccc(c(c1Cl)NS(=O)(=O)c2nc3nc(cc(n3n2)OC)OC)Cl
G8A RCSB PDB A0A1D8PJF9 506.3 Da LogP 1.78 TPSA 136.6 1 viol. ✓ Clean CCOC(=O)c1ccccc1S(=O)(=O)NC(=O)Nc2nc(cc(n2)I)OC
G8G RCSB PDB A0A1D8PJF9 442.3 Da LogP 1.10 TPSA 185.4 ✓ Ro5 ✓ Clean Cc1ncc(c(n1)N)CN(C=O)/C(=C(/CCOP(=O)(O)OP(=O)(O…
H4V RCSB PDB A0A1D8PJF9 492.3 Da LogP 1.39 TPSA 136.6 ✓ Ro5 ✓ Clean COc1cc(nc(n1)NC(=O)NS(=O)(=O)c2ccccc2C(=O)OC)I
P22 RCSB PDB P17597 206.0 Da LogP 0.23 TPSA 113.3 ✓ Ro5 ✓ Clean CCO[P@](=O)(O)OP(=O)(O)O
PXD RCSB PDB P17597 483.4 Da LogP 2.61 TPSA 116.9 ✓ Ro5 ✓ Clean COc1cnc(n2c1nc(n2)NS(=O)(=O)c3c(cccc3OCC(F)F)C(…
TDM RCSB PDB P17597 468.4 Da LogP 2.51 TPSA 188.6 ✓ Ro5 ✓ Clean Cc1ncc(c(n1)N)CN\2C(=C(S/C2=C(\C)/O)CCO[P@@](=O…
TP9 RCSB PDB P17597 412.3 Da LogP -0.03 TPSA 182.8 1 viol. ✓ Clean Cc1ncc(c(n1)N)CN/C(=C(/CCO[P@](=O)([O-])O[P@@](…
TZD RCSB PDB P17597 440.3 Da LogP 0.72 TPSA 187.1 ✓ Ro5 ✓ Clean Cc1ncc(c(n1)N)CN2C(=C(SC2=O)CCO[P@@](=O)(O)OP(=…

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.