KpATCC43816 Protein target profile

xanthine permease family protein

Accession: VK055_0823

Gene: AIK79446.1 pbuX 3D evidence: AlphaFold DB model + ColabFold model Metabolism Not in network UniProt A0A0H3GTC4
Length 459
Pocket druggability (P2Rank · AlphaFold DB model) 0.817
Direct ligand evidence 0 54 total records
Functional annotation 0 EC 6 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 (%)
28.481 Lower values reduce human off-target concern.
Human E-value
1.88e-08
Gut microbiome similarity
0.6% of screened genomes Lower prevalence suggests narrower overlap with the screened gut microbiome.

Essentiality

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

Structure confidence

ColabFold pLDDT
89.53 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) 0.817
Structure A0A0H3GTC4
Pocket Pocket 1
Druggability (FPocket) 0.849
Structure A0A0H3GTC4
Pocket Pocket 1
ColabFold model
P2Rank 0.757 · Pocket 1
FPocket 0.758 · Pocket 1
Core conservation Conserved core gene
Roary core
CoreCruncher core
Gut microbiome 27 / 4744 genomes with a hit
Prevalence 0.6%

Metabolic context

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

This protein is not associated with the imported metabolic network for this genome.

Browse the genome's metabolic network

Imported from KpATCC43816.sbml · 2026-07-09

Sequence

Primary amino-acid sequence viewer.

MSDEHHSGLLYGLEQRIPPLPAFFSALQHVLAGLVGIITPPLIIGATLGLGDWLPYLISMSLLASGIGTFLQSNRVWGIGAGMICMQGTSFAFLGVTVAGGMWVKAQGGGPQDMMAMLFGVNFVAALVPVIVSRFIEPLKKIFTPIITGSVIALIGISLIKVSVINWCGGEKAEDFASMSNIALGAGTLGVIVLLSCAKNRWLRLSSVVVGIAVGCIAAGLSGQFHLHSLGDTLFRLPTLFPFGFQFNSAIFLPVALVSLVCILEAVGDLTANSLISQQSVDDRAFRNRLKGGILADGVSCMVAAMLCAFPNTTFAQNNGVIQMTGVASRYVGRYIGVILILLGLFPPVGELLRQIPAPVLGGATMVMFGCVVAAGIRIITQTPLSRRDVLIVGLAFGAGLGVESVPAFLSHFPPMVGDLFGSAATSGGLVAIALNLILPQEQAATKTIRSQDDRAESV

Functional annotations

Enzyme classification and Gene Ontology terms linked to this protein.

6 GO

Subcellular localization

Localization
CytoplasmicMembrane

Gene Ontology (GO)

6
  • GO:0022857 Enables the transfer of a substance, usually a specific substance or a group of related substances, from one side of a membrane to the other.
  • GO:0016020 A lipid bilayer along with all the proteins and protein complexes embedded in it and attached to it.
  • GO:0055085 The process in which a solute is transported across a lipid bilayer, from one side of a membrane to the other.
  • GO:0015851 The directed movement of a nucleobase, any nitrogenous base that is a constituent of a nucleoside, nucleotide, or nucleic acid, into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore.
  • GO:0005886 The membrane surrounding a cell that separates the cell from its external environment. It consists of a phospholipid bilayer and associated proteins.
  • GO:0042907 Enables the transfer of xanthine from one side of a membrane to the other. Xanthine (2,6-dihydroxypurine) is a purine formed in the metabolic breakdown of guanine, but is not present in nucleic acids.

Sequence domains and features

Domain and signature matches imported from InterPro and related databases.

47 records
Show feature table
Start End DB Term Name
105 115 Phobius NON_CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the extracellular region.
176 198 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
205 227 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
226 244 Phobius NON_CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the extracellular region.
176 195 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
143 164 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
23 435 NCBIfam NF037981 purine/pyrimidine permease
21 43 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
268 331 Phobius CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the cytoplasm.
77 99 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
53 70 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
411 415 Phobius NON_CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the extracellular region.
114 136 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
416 439 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
5 451 PANTHER PTHR42810 PURINE PERMEASE C1399.01C-RELATED
18 438 NCBIfam TIGR00801 NCS2 family nucleobase:cation symporter
18 438 InterPro IPR006042 Xanthine/uracil permease
143 165 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
23 407 Pfam PF00860 Permease family
23 407 InterPro IPR006043 Nucleobase cation symporter 2 family
116 136 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
53 71 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
356 377 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
242 264 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
356 376 ProSitePatterns PS01116 Xanthine/uracil permeases family signature.
356 376 InterPro IPR006042 Xanthine/uracil permease
72 82 Phobius CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the cytoplasm.
165 175 Phobius NON_CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the extracellular region.
1 19 Phobius CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the cytoplasm.
245 267 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
390 412 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
378 388 Phobius CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the cytoplasm.
48 52 Phobius NON_CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the extracellular region.
440 459 Phobius CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the cytoplasm.
83 104 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
331 350 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
202 225 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
332 350 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
355 377 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
351 355 Phobius NON_CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the extracellular region.
389 410 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
26 440 NCBIfam TIGR03173 xanthine permease
26 440 InterPro IPR017588 Uric acid permease UacT-like
20 47 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
137 142 Phobius CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the cytoplasm.
417 439 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
196 201 Phobius CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the cytoplasm.

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
0.817
Likely same site as FPocket 5 3.9 Å 20 shared residues 77% of smaller site
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Surrounding area
Pocket 2 P2Rank #2
0.555
Likely same site as FPocket 3 5.5 Å 17 shared residues 89% of smaller site
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Surrounding area
Pocket 3 P2Rank #3
0.168
Likely same site as FPocket 3 6.4 Å 10 shared residues 67% of smaller site
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Surrounding area
Pocket 4 P2Rank #4
0.131
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Surrounding area
Pocket 5 P2Rank #5
0.092
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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
0.849
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Surrounding area
Pocket 2 FPocket #3
0.736 Unusual size
Likely same site as P2Rank 2 5.5 Å 17 shared residues 89% of smaller site
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Surrounding area
Pocket 3 FPocket #5
0.677 Unusual size
Likely same site as P2Rank 1 3.9 Å 20 shared residues 77% of smaller site
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Surrounding area
Pocket 4 FPocket #2
0.662
Likely same site as P2Rank 1 6.1 Å 11 shared residues 85% of smaller site
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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_A0A0H3GTC4
AlphaFold DB full sequence Viewing
ColabFold VK055_0823
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
KEG PDB via homolog Open detail RCSB PDB
LMT PDB via homolog Detail RCSB PDB
URA PDB via homolog Detail RCSB PDB
XAN PDB via homolog Detail RCSB PDB
ZINC100053689 ZINC proposed compound · Tanimoto 1.000 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
KEG RCSB PDB P0AGM8 O=[W]1234O[W]567(=O)O18[P]91O%10%11[W]%12%13(=O…
LMT RCSB PDB Q07307 510.6 Da LogP -0.45 TPSA 178.5 3 viol. ✓ Clean CCCCCCCCCCCCO[C@H]1[C@@H]([C@H]([C@@H]([C@H](O1…
URA RCSB PDB P0AGM8 112.1 Da LogP -0.94 TPSA 65.7 ✓ Ro5 ✓ Clean C1=CNC(=O)NC1=O
XAN RCSB PDB Q07307 152.1 Da LogP -1.06 TPSA 94.4 ✓ Ro5 ✓ Clean c1[nH]c2c(n1)C(=O)NC(=O)N2

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.