Protein target profile

VK055_3880

octaprenyl-diphosphate synthase

Genome: KpATCC43816 Gene: ispB AIK82430.1 3D evidence: AlphaFold DB model + ColabFold model Metabolism 1 reaction UniProt A0A0H3H3J7
Length 323
Pocket druggability 0.903
Metabolic reactions 1
Chokepoint Yes
Direct ligand evidence 0 61 total records
Functional annotation 0 EC 1 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
Hit
Human identity (%)
30.96 Lower values reduce human off-target concern.
Human E-value
8.67e-42
Gut microbiome similarity
3.9% of screened genomes Lower prevalence suggests narrower overlap with the screened gut microbiome.

Essentiality

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

Localization

Localization
Cytoplasmic

Structure confidence

ColabFold pLDDT
92.83 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 0.903
Structure A0A0H3H3J7
Pocket Pocket 8
P2Rank 0.924
Structure A0A0H3H3J7
Pocket Pocket 1
ColabFold model
FPocket 0.588 · Pocket 4
P2Rank 0.924 · Pocket 1
Core conservation Conserved core gene
Roary core
CoreCruncher core
Gut microbiome 187 / 4744 genomes with a hit
Prevalence 3.9%

Cross-references

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

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 Terpenoid backbone biosynthesis, no isoenzyme backup detected, more central than 88.7% of genes in this genome.

Relative network centrality 88.7% more central than 88.7% 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.

MNLEKINELTAQDMAGVNATILEQLNSDVQLINQLGYYIVSGGGKRIRPMIAVLAARAVGYQGSAHVTIAALIEFIHTATLLHDDVVDESDMRRGKATANAAFGNAASVLVGDFIYTRAFQMMTQLGSLKILEVMSEAVNVIAEGEVLQLMNVNDPDITEENYMRVIYSKTARLFEAASQCAGLLADCTAEEERALQDYGRYLGTAFQLIDDLLDYSSDGERLGKNVGDDLNEGKPTLPLLHAMHHGTPDQSAMIRGAIEQGNGRHLLDAVLETMATCGSLEWTQKRAEEEADKAIAALQILPDTPWREALIGLAHIAVQRDH

Functional annotations

Enzyme classification and Gene Ontology terms linked to this protein.

1 GO

Gene Ontology (GO)

1
  • GO:0008299 The chemical reactions and pathways resulting in the formation of an isoprenoid compound, isoprene (2-methylbuta-1,3-diene) or compounds containing or derived from linked isoprene (3-methyl-2-butenylene) residues.

Sequence domains and features

Domain and signature matches imported from InterPro and related databases.

15 records
Show feature table
Start End DB Term Name
6 322 SUPERFAMILY SSF48576 Terpenoid synthases
6 322 InterPro IPR008949 Isoprenoid synthase domain superfamily
81 95 ProSitePatterns PS00723 Polyprenyl synthases signature 1.
81 95 InterPro IPR033749 Polyprenyl synthetase, conserved site
39 321 SFLD SFLDS00005 Isoprenoid Synthase Type I
27 321 CDD cd00685 Trans_IPPS_HT
27 321 InterPro IPR000092 Polyprenyl synthetase
203 215 ProSitePatterns PS00444 Polyprenyl synthases signature 2.
203 215 InterPro IPR033749 Polyprenyl synthetase, conserved site
1 323 Gene3D G3DSA:1.10.600.10 Farnesyl Diphosphate Synthase
1 323 InterPro IPR008949 Isoprenoid synthase domain superfamily
4 321 PANTHER PTHR12001 GERANYLGERANYL PYROPHOSPHATE SYNTHASE
1 323 FunFam G3DSA:1.10.600.10:FF:000002 Octaprenyl diphosphate synthase
30 263 Pfam PF00348 Polyprenyl synthetase
30 263 InterPro IPR000092 Polyprenyl synthetase

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 #8
0.903
Likely same site as P2Rank 2 1.4 Å 10 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
0.924
Show in viewer
Surrounding area
Site 2 P2Rank #2
0.241
Likely same site as FPocket 8 1.4 Å 10 shared residues 100% of smaller site
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Surrounding area
Site 3 P2Rank #3
0.038
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Surrounding area
Site 4 P2Rank #4
0.035
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Surrounding area
Site 5 P2Rank #5
0.035
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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_A0A0H3H3J7
AlphaFold DB full sequence Viewing
ColabFold VK055_3880
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.

61 records
Chemistry signal

Structural and bioactivity evidence are both available for this target.

Direct evidence 0 same-protein records
Transferred evidence 11 records from similar proteins
Structural ligands 8 0 loaded crystals
Measured bioactivity 3 direct and transferred ChEMBL records
Proposed compounds 50 similarity-based ZINC candidates
Best available ligand signal
2DE PDB via homolog 368.3 Da · LogP 4.24 · TPSA 113.3 Open detail RCSB PDB
B29 PDB via homolog Detail RCSB PDB
DMA PDB via homolog Detail RCSB PDB
FPP PDB via homolog Detail RCSB PDB
HJX 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
2DE RCSB PDB O66129 368.3 Da LogP 4.24 TPSA 113.3 ✓ Ro5 ✓ Clean CC(=CCC/C(=C/CC/C=C/CO[P@](=O)(O)OP(=O)(O)O)/C)C
B29 RCSB PDB P0AD57 448.3 Da LogP 3.80 TPSA 148.4 ✓ Ro5 ✓ Clean c1ccc2c(c1)c3cccc(c3o2)c4cccc(c4)CC(O)(P(=O)(O)…
DMA RCSB PDB Q8NT37 246.1 Da LogP 1.18 TPSA 113.3 ✓ Ro5 ✓ Clean CC(=CCO[P@@](=O)(O)OP(=O)(O)O)C
FPP RCSB PDB Q5HZ00 382.3 Da LogP 4.63 TPSA 113.3 ✓ Ro5 ✓ Clean CC(=CCC/C(=C/CC/C(=C/CO[P@@](=O)(O)OP(=O)(O)O)/…
HJX RCSB PDB P0AD57 350.5 Da LogP 6.17 TPSA 66.8 1 viol. ✓ Clean CCCCCCCCCCCCCCOc1cccc(c1C(=O)O)O
ISY RCSB PDB Q5HZ00 262.2 Da LogP 1.90 TPSA 104.1 ✓ Ro5 ✓ Clean CC(=C)CCS[P@@](=O)(O)OP(=O)(O)O
POP RCSB PDB Q9A6I1 176.0 Da LogP -2.08 TPSA 129.9 ✓ Ro5 ✓ Clean O[P@@](=O)([O-])O[P@@](=O)(O)[O-]
PPV RCSB PDB Q5HZ00 178.0 Da LogP -0.81 TPSA 124.3 ✓ Ro5 ✓ Clean OP(=O)(O)OP(=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.