Protein profile

VK055_0823

xanthine permease family protein

Genome: KpATCC43816

Gene: AIK79446.1 pbuX Structure source: AlphaFold + ColabFold UniProt A0A0H3GTC4

Export view

Amino acids 459

Annotations 6

Features 47

PDB binders 4

Druggability 0.849

Overview

Basic information about this protein and its source genome.

Accession: VK055_0823
Assembly: Klebsiella pneumoniae subsp. pneumoniae strain ATCC 43816 KPPR1, complete genome
Gene: AIK79446.1 pbuX
Status: annotated
Amino acids: 459
Structure source: AlphaFold + ColabFold

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.

Target profile

Computed evidence for target prioritization.

Human off-target: hit
Human identity (%): 28.481
Human E-value: 1.88e-08
Gut microbiome off-target: hit
Essential (DEG): N
DEG identity (%): 29.808
Localization: CytoplasmicMembrane
ColabFold pLDDT: 89.53

Selected Druggability evidence

AlphaFold / UniProt model

Selected Druggability is the FPocket score chosen for ranking using the curated structure priority. The 3D viewer may show a different loaded structure, so its visible pockets can differ.

FPocket 0.849

Structure A0A0H3GTC4

Pocket Pocket 1

P2Rank 0.817

Structure A0A0H3GTC4

Pocket Pocket 1

ColabFold model

FPocket 0.758 · Pocket 1

P2Rank 0.757 · Pocket 1

Core conservation Conserved core gene

Roary core

CoreCruncher core

Gut microbiome 27 / 4744 genomes with a hit

Normalized 0.006

Sequence

Primary amino-acid sequence viewer.

Functional Annotations

Enzyme classification and Gene Ontology terms linked to this protein.

6 GO

Gene Ontology (GO)

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 Features

Domain/signature hits 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; predicted models typically cover the full protein.

Loading 3D structure...

Legend High Medium Low

Structural evidence

0 + 2

Experimental PDB entries and predicted models. Click Switch to display a different structure in the viewer.

Entry	Method	Resolution	Chain	Coverage	Links	Status
AlphaFold AF_A0A0H3GTC4	AlphaFold	—	—	full sequence	—	Viewing
ColabFold VK055_0823	ColabFold	—	—	full sequence	—	Loaded

Pocket details FPocket · P2Rank — toggle visibility and zoom from here, or open full viewer

Pockets (FPOCKET)

Showing top-ranked FPocket candidates by druggability. Druggability is color-coded: high (0.7 or higher), medium (0.4 to 0.69), low (below 0.4).

FPOCKET	Sticks	Spheres	Surfaces	Druggability	Labels	Zoom	Positions
3				0.736
5				0.677
12				0.48

Pockets (P2RANK)

Showing top-ranked P2Rank candidates by probability. Probability is color-coded per P2Rank calibration: high (≥ 0.5), medium (0.2 – 0.49), low (< 0.2).

P2RANK	Score	Probability
1	13.54	0.69
2	5.67	0.274
3	2.83	0.088
4	2.41	0.065
5	2.3	0.058

Pockets (FPOCKET)

Showing top-ranked FPocket candidates by druggability. Druggability is color-coded: high (0.7 or higher), medium (0.4 to 0.69), low (below 0.4).

FPOCKET	Sticks	Spheres	Surfaces	Druggability	Labels	Zoom	Positions
1				0.758
2				0.34

Pockets (P2RANK)

Showing top-ranked P2Rank candidates by probability. Probability is color-coded per P2Rank calibration: high (≥ 0.5), medium (0.2 – 0.49), low (< 0.2).

P2RANK	Score	Probability
1	13.18	0.677
2	8.14	0.433
3	3.19	0.109
4	2.28	0.057
5	1.87	0.037

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

Highest-confidence structural evidence: ligands co-crystallized with this exact protein. If the source PDB is loaded in TPW, use Open crystal to inspect it in the structure viewer.

No PDB structure with a co-crystallized ligand found for this exact protein.

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.

Ligand	Source crystal	UniProt (homolog)	MW · LogP · TPSA	Lipinski	PAINS	SMILES
KEG	5XLS	P0AGM8	—	—	—	`O=[W]1234O[W]567(=O)O18[P]91O%10%11[W]%12%13(=O…`
LMT	5I6C	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	5XLS	P0AGM8	112.1 Da LogP -0.94 TPSA 65.7	✓ Ro5	✓ Clean	`C1=CNC(=O)NC1=O`
XAN	5I6C	Q07307	152.1 Da LogP -1.06 TPSA 94.4	✓ Ro5	✓ Clean	`c1[nH]c2c(n1)C(=O)NC(=O)N2`

Experimental bioactivity from ChEMBL measured directly on this protein. Score = pchembl (−log Ki/IC₅₀; higher = more potent).

No ChEMBL bioactivity data found for this exact protein.

Bioactivity inferred from similar proteins in ChEMBL. Score = pchembl (−log Ki/IC₅₀; higher = more potent).

No ChEMBL hits found through similar proteins.

Proposed virtual-screening candidates from ZINC. Score = Tanimoto similarity to a known binder (0–1; higher = more similar).

Ligand	Tanimoto	MW · LogP · TPSA	Lipinski	PAINS	SMILES
ZINC100053689	1.000	482.6 Da LogP -1.23 TPSA 178.5	2 viol.	✓ Clean	`CCCCCCCCCCO[C@H]1O[C@H](CO)[C@@H](O[C@H]2O[C@H]…`
ZINC100053691	1.000	496.6 Da LogP -0.84 TPSA 178.5	2 viol.	✓ Clean	`CCCCCCCCCCCO[C@H]1O[C@H](CO)[C@@H](O[C@H]2O[C@H…`
ZINC1501015302	1.000	482.6 Da LogP -1.23 TPSA 178.5	2 viol.	✓ Clean	`CCCCCCCCCCO[C@@H]1O[C@H](CO)[C@@H](O[C@H]2O[C@H…`
ZINC2039285652	1.000	454.5 Da LogP -2.01 TPSA 178.5	2 viol.	✓ Clean	`CCCCCCCCO[C@H]1O[C@H](CO)[C@H](O[C@@H]2O[C@H](C…`
ZINC2039285653	1.000	454.5 Da LogP -2.01 TPSA 178.5	2 viol.	✓ Clean	`CCCCCCCCO[C@H]1O[C@H](CO)[C@H](O[C@@H]2O[C@H](C…`
ZINC2039285654	1.000	454.5 Da LogP -2.01 TPSA 178.5	2 viol.	✓ Clean	`CCCCCCCCO[C@H]1O[C@H](CO)[C@H](O[C@@H]2O[C@H](C…`
ZINC2039285655	1.000	454.5 Da LogP -2.01 TPSA 178.5	2 viol.	✓ Clean	`CCCCCCCCO[C@H]1O[C@H](CO)[C@H](O[C@@H]2O[C@H](C…`
ZINC2053493146	1.000	482.6 Da LogP -1.23 TPSA 178.5	2 viol.	✓ Clean	`CCCCCCCCCCO[C@H]1O[C@H](CO)[C@H](O[C@@H]2O[C@H]…`
ZINC2053493147	1.000	482.6 Da LogP -1.23 TPSA 178.5	2 viol.	✓ Clean	`CCCCCCCCCCO[C@H]1O[C@H](CO)[C@H](O[C@@H]2O[C@H]…`
ZINC2053493148	1.000	482.6 Da LogP -1.23 TPSA 178.5	2 viol.	✓ Clean	`CCCCCCCCCCO[C@H]1O[C@H](CO)[C@H](O[C@@H]2O[C@H]…`
ZINC2053493149	1.000	482.6 Da LogP -1.23 TPSA 178.5	2 viol.	✓ Clean	`CCCCCCCCCCO[C@H]1O[C@H](CO)[C@H](O[C@@H]2O[C@H]…`
ZINC238809244	1.000	510.6 Da LogP -0.45 TPSA 178.5	3 viol.	✓ Clean	`CCCCCCCCCCCCO[C@@H]1O[C@H](CO)[C@@H](O[C@H]2O[C…`
ZINC238809245	1.000	510.6 Da LogP -0.45 TPSA 178.5	3 viol.	✓ Clean	`CCCCCCCCCCCCO[C@@H]1O[C@H](CO)[C@@H](O[C@H]2O[C…`
ZINC252695223	1.000	482.6 Da LogP -1.23 TPSA 178.5	2 viol.	✓ Clean	`CCCCCCCCCCO[C@@H]1O[C@H](CO)[C@@H](O[C@H]2O[C@H…`
ZINC252695224	1.000	482.6 Da LogP -1.23 TPSA 178.5	2 viol.	✓ Clean	`CCCCCCCCCCO[C@@H]1O[C@H](CO)[C@@H](O[C@H]2O[C@H…`
ZINC252695225	1.000	482.6 Da LogP -1.23 TPSA 178.5	2 viol.	✓ Clean	`CCCCCCCCCCO[C@@H]1O[C@H](CO)[C@@H](O[C@H]2O[C@H…`
ZINC252695226	1.000	482.6 Da LogP -1.23 TPSA 178.5	2 viol.	✓ Clean	`CCCCCCCCCCO[C@@H]1O[C@H](CO)[C@@H](O[C@H]2O[C@H…`
ZINC58649715	1.000	496.6 Da LogP -0.84 TPSA 178.5	2 viol.	✓ Clean	`CCCCCCCCCCCO[C@@H]1O[C@H](CO)[C@@H](O[C@H]2O[C@…`
ZINC59978443	1.000	454.5 Da LogP -2.01 TPSA 178.5	2 viol.	✓ Clean	`CCCCCCCCO[C@@H]1O[C@H](CO)[C@@H](O[C@H]2O[C@H](…`
ZINC66157001	1.000	468.5 Da LogP -1.62 TPSA 178.5	2 viol.	✓ Clean	`CCCCCCCCCO[C@@H]1O[C@H](CO)[C@@H](O[C@H]2O[C@H]…`
ZINC70669940	1.000	482.6 Da LogP -1.23 TPSA 178.5	2 viol.	✓ Clean	`CCCCCCCCCCO[C@@H]1O[C@@H](CO)[C@@H](O[C@H]2O[C@…`
ZINC70669941	1.000	482.6 Da LogP -1.23 TPSA 178.5	2 viol.	✓ Clean	`CCCCCCCCCCO[C@@H]1O[C@@H](CO)[C@@H](O[C@H]2O[C@…`
ZINC70669942	1.000	482.6 Da LogP -1.23 TPSA 178.5	2 viol.	✓ Clean	`CCCCCCCCCCO[C@@H]1O[C@@H](CO)[C@@H](O[C@H]2O[C@…`
ZINC70669943	1.000	482.6 Da LogP -1.23 TPSA 178.5	2 viol.	✓ Clean	`CCCCCCCCCCO[C@@H]1O[C@@H](CO)[C@@H](O[C@H]2O[C@…`
ZINC77311968	1.000	454.5 Da LogP -2.01 TPSA 178.5	2 viol.	✓ Clean	`CCCCCCCCO[C@@H]1O[C@H](CO)[C@@H](O[C@@H]2O[C@H]…`
ZINC83433913	1.000	426.5 Da LogP -2.79 TPSA 178.5	2 viol.	✓ Clean	`CCCCCCO[C@@H]1O[C@H](CO)[C@@H](O[C@H]2O[C@H](CO…`
ZINC85482724	1.000	482.6 Da LogP -1.23 TPSA 178.5	2 viol.	✓ Clean	`CCCCCCCCCCO[C@@H]1O[C@H](CO)[C@@H](O[C@H]2O[C@H…`
ZINC86002923	1.000	426.5 Da LogP -2.79 TPSA 178.5	2 viol.	✓ Clean	`CCCCCCO[C@@H]1O[C@H](CO)[C@H](O[C@H]2O[C@H](CO)…`
ZINC100623033	0.811	334.5 Da LogP 1.33 TPSA 99.4	✓ Ro5	✓ Clean	`CCCCCCCCCCCO[C@H]1O[C@@H](CO)[C@@H](O)[C@@H](O)…`
ZINC106384623	0.811	306.4 Da LogP 0.55 TPSA 99.4	✓ Ro5	✓ Clean	`CCCCCCCCCO[C@@H]1O[C@H](CO)[C@@H](O)[C@H](O)[C@…`
ZINC118906329	0.811	348.5 Da LogP 1.72 TPSA 99.4	✓ Ro5	✓ Clean	`CCCCCCCCCCCCO[C@H]1O[C@H](CO)[C@H](O)[C@@H](O)[…`
ZINC118911909	0.811	306.4 Da LogP 0.55 TPSA 99.4	✓ Ro5	✓ Clean	`CCCCCCCCCO[C@H]1O[C@H](CO)[C@H](O)[C@@H](O)[C@@…`
ZINC140974145	0.811	306.4 Da LogP 0.55 TPSA 99.4	✓ Ro5	✓ Clean	`CCCCCCCCCO[C@@H]1O[C@H](CO)[C@H](O)[C@@H](O)[C@…`
ZINC141261234	0.811	320.4 Da LogP 0.94 TPSA 99.4	✓ Ro5	✓ Clean	`CCCCCCCCCCO[C@@H]1O[C@H](CO)[C@H](O)[C@@H](O)[C…`
ZINC14880349	0.811	306.4 Da LogP 0.55 TPSA 99.4	✓ Ro5	✓ Clean	`CCCCCCCCCO[C@@H]1O[C@@H](CO)[C@@H](O)[C@@H](O)[…`
ZINC14880350	0.811	306.4 Da LogP 0.55 TPSA 99.4	✓ Ro5	✓ Clean	`CCCCCCCCCO[C@H]1O[C@@H](CO)[C@@H](O)[C@@H](O)[C…`
ZINC15609263	0.811	306.4 Da LogP 0.55 TPSA 99.4	✓ Ro5	✓ Clean	`CCCCCCCCCO[C@@H]1O[C@H](CO)[C@@H](O)[C@H](O)[C@…`
ZINC1849674	0.811	292.4 Da LogP 0.16 TPSA 99.4	✓ Ro5	✓ Clean	`CCCCCCCCO[C@H]1O[C@@H](CO)[C@H](O)[C@@H](O)[C@@…`
ZINC2046837	0.811	306.4 Da LogP 0.55 TPSA 99.4	✓ Ro5	✓ Clean	`CCCCCCCCCO[C@H]1O[C@@H](CO)[C@H](O)[C@@H](O)[C@…`
ZINC248251557	0.811	320.4 Da LogP 0.94 TPSA 99.4	✓ Ro5	✓ Clean	`CCCCCCCCCCO[C@H]1O[C@@H](CO)[C@H](O)[C@@H](O)[C…`
ZINC40165555	0.811	292.4 Da LogP 0.16 TPSA 99.4	✓ Ro5	✓ Clean	`CCCCCCCCO[C@@H]1O[C@H](CO)[C@@H](O)[C@H](O)[C@H…`
ZINC49878456	0.811	306.4 Da LogP 0.55 TPSA 99.4	✓ Ro5	✓ Clean	`CCCCCCCCCO[C@H]1O[C@@H](CO)[C@@H](O)[C@@H](O)[C…`
ZINC53683291	0.811	292.4 Da LogP 0.16 TPSA 99.4	✓ Ro5	✓ Clean	`CCCCCCCCO[C@@H]1O[C@H](CO)[C@H](O)[C@H](O)[C@H]…`
ZINC58538417	0.811	320.4 Da LogP 0.94 TPSA 99.4	✓ Ro5	✓ Clean	`CCCCCCCCCCO[C@@H]1O[C@H](CO)[C@@H](O)[C@H](O)[C…`
ZINC71788563	0.811	292.4 Da LogP 0.16 TPSA 99.4	✓ Ro5	✓ Clean	`CCCCCCCCO[C@@H]1O[C@@H](CO)[C@@H](O)[C@H](O)[C@…`
ZINC85478989	0.811	320.4 Da LogP 0.94 TPSA 99.4	✓ Ro5	✓ Clean	`CCCCCCCCCCO[C@H]1O[C@H](CO)[C@@H](O)[C@H](O)[C@…`
ZINC85590873	0.811	320.4 Da LogP 0.94 TPSA 99.4	✓ Ro5	✓ Clean	`CCCCCCCCCCO[C@H]1O[C@@H](CO)[C@@H](O)[C@@H](O)[…`
ZINC85590883	0.811	320.4 Da LogP 0.94 TPSA 99.4	✓ Ro5	✓ Clean	`CCCCCCCCCCO[C@H]1O[C@@H](CO)[C@@H](O)[C@@H](O)[…`
ZINC85590888	0.811	320.4 Da LogP 0.94 TPSA 99.4	✓ Ro5	✓ Clean	`CCCCCCCCCCO[C@@H]1O[C@@H](CO)[C@@H](O)[C@@H](O)…`
ZINC94437834	0.811	292.4 Da LogP 0.16 TPSA 99.4	✓ Ro5	✓ Clean	`CCCCCCCCO[C@H]1O[C@H](CO)[C@H](O)[C@H](O)[C@H]1O`

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.