KpATCC43816 Protein target profile

tonB-system energizer ExbB

Accession: VK055_4048

Gene: AIK82595.1 exbB 3D evidence: AlphaFold DB model + ColabFold model Metabolism Not in network UniProt A0A0H3GYI0

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Length 238

Pocket druggability (P2Rank · AlphaFold DB model) 0.055

Direct ligand evidence 0 52 total records

Functional annotation 0 EC 5 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.

Main supporting evidence

No similar human protein detected The current BLAST sequence screen did not find a significant human match, lowering apparent off-target risk. Core gene across strains Marked as conserved by both pan-genome tools: Roary and CoreCruncher. Moderate predicted binding pocket FPocket selected-pocket score 0.55. This supports review but is not experimental validation. Structure available AlphaFold DB model + ColabFold model Review the complete evidence below

Risks to review

Evidence coverage

Core evidence streams are available for this target.

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: No hit
Gut microbiome similarity: 2.6% of screened genomes Lower prevalence suggests narrower overlap with the screened gut microbiome.

Essentiality

Essential (DEG): Y
DEG identity (%): 44.118 Higher values support similarity to known essential genes.
DEG E-value: 3.51e-12 Smaller values mean stronger essential-gene similarity.

Structure confidence

ColabFold pLDDT: 90.58 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) 0.055

Structure A0A0H3GYI0

Pocket Pocket 1

Druggability (FPocket) 0.55

Structure A0A0H3GYI0

Pocket Pocket 16

ColabFold model

P2Rank 0.071 · Pocket 1

FPocket 0.82 · Pocket 17

Core conservation Conserved core gene

Roary core

CoreCruncher core

Gut microbiome 124 / 4744 genomes with a hit

Prevalence 2.6%

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.

MQADLSVWGMYHHADIVVKVVMIGLILASVVTWAIFFGKGAEILASKRRLKREQQQLAEARSLDQASDIASAFEAKSLTTQLINEAQNELELSAGAEDNEGIKERTGFRLERRVAAVGRHMGRGNGYLATIGAISPFVGLFGTVWGIMNSFIGIAQTQTTNLAVVAPGIAEALLATAIGLFAAIPAVVIYNIFARMIGSYKASLGDVAAQVLLLQSRDLDLSASGVKPVRSAQKLRVG

Functional annotations

Enzyme classification and Gene Ontology terms linked to this protein.

5 GO

Subcellular localization

Localization: CytoplasmicMembrane

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:0005886 The membrane surrounding a cell that separates the cell from its external environment. It consists of a phospholipid bilayer and associated proteins.
GO:0017038 The targeting and directed movement of proteins into a cell or organelle. Not all import involves an initial targeting event.

Sequence domains and features

Domain and signature matches imported from InterPro and related databases.

16 records

Show feature table

Start	End	DB	Term	Name
172	194	TMHMM	TMhelix	Region of a membrane-bound protein predicted to be embedded in the membrane.
80	198	Pfam	PF01618	MotA/TolQ/ExbB proton channel family
80	198	InterPro	IPR002898	MotA/TolQ/ExbB proton channel
153	171	Phobius	NON_CYTOPLASMIC_DOMAIN	Region of a membrane-bound protein predicted to be outside the membrane, in the extracellular region.
194	238	Phobius	CYTOPLASMIC_DOMAIN	Region of a membrane-bound protein predicted to be outside the membrane, in the cytoplasm.
39	126	Phobius	CYTOPLASMIC_DOMAIN	Region of a membrane-bound protein predicted to be outside the membrane, in the cytoplasm.
1	15	Phobius	NON_CYTOPLASMIC_DOMAIN	Region of a membrane-bound protein predicted to be outside the membrane, in the extracellular region.
126	148	TMHMM	TMhelix	Region of a membrane-bound protein predicted to be embedded in the membrane.
43	63	Coils	Coil	Coil
6	217	NCBIfam	TIGR02797	tonB-system energizer ExbB
6	217	InterPro	IPR014164	TonB-system energizer ExbB type-1
127	152	Phobius	TRANSMEMBRANE	Region of a membrane-bound protein predicted to be embedded in the membrane.
4	225	PANTHER	PTHR30625	PROTEIN TOLQ
172	193	Phobius	TRANSMEMBRANE	Region of a membrane-bound protein predicted to be embedded in the membrane.
16	38	Phobius	TRANSMEMBRANE	Region of a membrane-bound protein predicted to be embedded in the membrane.
15	37	TMHMM	TMhelix	Region of a membrane-bound protein predicted to be embedded in the membrane.

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

0.055

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Surrounding area

Pocket 2 P2Rank #2

0.037

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Surrounding area

Pocket 3 P2Rank #3

0.007

Likely same site as FPocket 16 2.7 Å 6 shared residues 100% of smaller site

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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 #16

0.55

Likely same site as P2Rank 3 2.7 Å 6 shared residues 100% of smaller site

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Surrounding area

Pocket 2 FPocket #21

0.248

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Surrounding area

Pocket 3 FPocket #1

0.202

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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_A0A0H3GYI0	AlphaFold DB	—	—	full sequence	—	Viewing
ColabFold VK055_4048	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.

52 records

Chemistry signal

Structural ligand evidence is available for this target.

Direct evidence 0 same-protein records

Transferred evidence 2 records from similar proteins

Structural ligands 2 0 loaded crystals

Measured bioactivity 0 direct and transferred ChEMBL records

Proposed compounds 50 similarity-based ZINC candidates

Best available ligand signal

PEV PDB via homolog 720.0 Da · LogP 11.28 · TPSA 134.4 Open detail RCSB PDB

PGT PDB via homolog Detail RCSB PDB

ZINC102191119 ZINC proposed compound · Tanimoto 1.000 Detail ZINC

ZINC58649551 ZINC proposed compound · Tanimoto 1.000 Detail ZINC

ZINC102191158 ZINC proposed compound · Tanimoto 0.795 Detail ZINC

Highest-confidence structural evidence: ligands co-crystallized with this exact protein. If the source PDB is loaded in Target, 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
PEV RCSB PDB	6TYI	P0ABU7	720.0 Da LogP 11.28 TPSA 134.4	2 viol.	✓ Clean	`CCCCCCCCCCCCCCCCCC(=O)O[C@@H](COC(=O)CCCCCCCCCC…`
PGT RCSB PDB	6YE4	A0A1C3HJ46	751.0 Da LogP 10.67 TPSA 148.8	2 viol.	✓ Clean	`CCCCCCCCCCCCCCCCCC(=O)O[C@@H](COC(=O)CCCCCCCCCC…`

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
ZINC102191119 ZINC	1.000	498.6 Da LogP 3.65 TPSA 148.8	✓ Ro5	✓ Clean	`CCCCCCCC(=O)OC[C@H](CO[P@@](=O)(O)OC[C@@H](O)CO…`
ZINC58649551 ZINC	1.000	498.6 Da LogP 3.65 TPSA 148.8	✓ Ro5	✓ Clean	`CCCCCCCC(=O)OC[C@H](CO[P@@](=O)(O)OC[C@H](O)CO)…`
ZINC102191158 ZINC	0.795	456.5 Da LogP 3.08 TPSA 142.8	✓ Ro5	✓ Clean	`CCCCCCCCCCCCCC(=O)OC[C@H](O)CO[P@@](=O)(O)OC[C@…`
ZINC14880758 ZINC	0.795	484.6 Da LogP 3.86 TPSA 142.8	✓ Ro5	✓ Clean	`CCCCCCCCCCCCCCCC(=O)OC[C@@H](O)CO[P@](=O)(O)OC[…`
ZINC14880760 ZINC	0.795	484.6 Da LogP 3.86 TPSA 142.8	✓ Ro5	✓ Clean	`CCCCCCCCCCCCCCCC(=O)OC[C@H](O)CO[P@](=O)(O)OC[C…`
ZINC53683910 ZINC	0.795	484.6 Da LogP 3.86 TPSA 142.8	✓ Ro5	✓ Clean	`CCCCCCCCCCCCCCCC(=O)OC[C@H](O)CO[P@@](=O)(O)OC[…`
ZINC62592202 ZINC	0.795	456.5 Da LogP 3.08 TPSA 142.8	✓ Ro5	✓ Clean	`CCCCCCCCCCCCCC(=O)OC[C@H](O)CO[P@@](=O)(O)OC[C@…`
ZINC62592203 ZINC	0.795	456.5 Da LogP 3.08 TPSA 142.8	✓ Ro5	✓ Clean	`CCCCCCCCCCCCCC(=O)OC[C@@H](O)CO[P@@](=O)(O)OC[C…`
ZINC62592204 ZINC	0.795	484.6 Da LogP 3.86 TPSA 142.8	✓ Ro5	✓ Clean	`CCCCCCCCCCCCCCCC(=O)OC[C@@H](O)CO[P@@](=O)(O)OC…`
ZINC96094841 ZINC	0.795	456.5 Da LogP 3.08 TPSA 142.8	✓ Ro5	✓ Clean	`CCCCCCCCCCCCCC(=O)OC[C@@H](O)CO[P@@](=O)(O)OC[C…`
ZINC102190506 ZINC	0.729	467.5 Da LogP 4.25 TPSA 134.4	✓ Ro5	✓ Clean	`CCCCCCCC(=O)OC[C@H](CO[P@@](=O)(O)OCCN)OC(=O)CC…`
ZINC102190512 ZINC	0.729	467.5 Da LogP 4.25 TPSA 134.4	✓ Ro5	✓ Clean	`CCCCCCCC(=O)OC[C@@H](CO[P@@](=O)(O)OCCN)OC(=O)C…`
ZINC36178999 ZINC	0.711	424.5 Da LogP 4.27 TPSA 119.4	✓ Ro5	✓ Clean	`CCCCCCCC(=O)OC[C@@H](COP(=O)(O)O)OC(=O)CCCCCCC`
ZINC36179002 ZINC	0.711	424.5 Da LogP 4.27 TPSA 119.4	✓ Ro5	✓ Clean	`CCCCCCCC(=O)OC[C@H](COP(=O)(O)O)OC(=O)CCCCCCC`
ZINC27416437 ZINC	0.708	411.4 Da LogP 2.69 TPSA 134.4	✓ Ro5	✓ Clean	`CCCCCC(=O)OC[C@H](CO[P@](=O)(O)OCCN)OC(=O)CCCCC`
ZINC33902364 ZINC	0.708	411.4 Da LogP 2.69 TPSA 134.4	✓ Ro5	✓ Clean	`CCCCCC(=O)OC[C@@H](CO[P@@](=O)(O)OCCN)OC(=O)CCC…`
ZINC13543394 ZINC	0.694	455.4 Da LogP 2.15 TPSA 171.7	✓ Ro5	✓ Clean	`CCCCCC(=O)OC[C@H](CO[P@@](=O)(O)OC[C@H](N)C(=O)…`
ZINC5820131 ZINC	0.689	368.4 Da LogP 2.71 TPSA 119.4	✓ Ro5	✓ Clean	`CCCCCC(=O)OC[C@@H](COP(=O)(O)O)OC(=O)CCCCC`
ZINC5820134 ZINC	0.689	368.4 Da LogP 2.71 TPSA 119.4	✓ Ro5	✓ Clean	`CCCCCC(=O)OC[C@H](COP(=O)(O)O)OC(=O)CCCCC`
ZINC13544781 ZINC	0.686	482.6 Da LogP 4.22 TPSA 108.4	✓ Ro5	✓ Clean	`CCCCCCC(=O)OC[C@@H](CO[P@](=O)(O)OCC[N+](C)(C)C…`
ZINC13544783 ZINC	0.686	482.6 Da LogP 4.22 TPSA 108.4	✓ Ro5	✓ Clean	`CCCCCCC(=O)OC[C@H](CO[P@](=O)(O)OCC[N+](C)(C)C)…`
ZINC13543439 ZINC	0.667	454.5 Da LogP 3.44 TPSA 108.4	✓ Ro5	✓ Clean	`CCCCCC(=O)OC[C@@H](CO[P@](=O)(O)OCC[N+](C)(C)C)…`
ZINC13543441 ZINC	0.667	454.5 Da LogP 3.44 TPSA 108.4	✓ Ro5	✓ Clean	`CCCCCC(=O)OC[C@H](CO[P@](=O)(O)OCC[N+](C)(C)C)O…`
ZINC36079847 ZINC	0.636	344.5 Da LogP 4.15 TPSA 72.8	✓ Ro5	✓ Clean	`CCCCCCCC(=O)OC[C@@H](CO)OC(=O)CCCCCCC`
ZINC8214428 ZINC	0.636	344.5 Da LogP 4.15 TPSA 72.8	✓ Ro5	✓ Clean	`CCCCCCCC(=O)OC[C@H](CO)OC(=O)CCCCCCC`
ZINC100297583 ZINC	0.628	232.3 Da LogP 1.63 TPSA 66.8	✓ Ro5	✓ Clean	`CCCCCCCCC(=O)OC[C@@H](O)CO`
ZINC100503477 ZINC	0.628	260.4 Da LogP 2.41 TPSA 66.8	✓ Ro5	✓ Clean	`CCCCCCCCCCC(=O)OC[C@H](O)CO`
ZINC100503478 ZINC	0.628	260.4 Da LogP 2.41 TPSA 66.8	✓ Ro5	✓ Clean	`CCCCCCCCCCC(=O)OC[C@@H](O)CO`
ZINC2516268 ZINC	0.628	218.3 Da LogP 1.24 TPSA 66.8	✓ Ro5	✓ Clean	`CCCCCCCC(=O)OC[C@H](O)CO`
ZINC2516269 ZINC	0.628	246.3 Da LogP 2.02 TPSA 66.8	✓ Ro5	✓ Clean	`CCCCCCCCCC(=O)OC[C@H](O)CO`
ZINC2568190 ZINC	0.628	232.3 Da LogP 1.63 TPSA 66.8	✓ Ro5	✓ Clean	`CCCCCCCCC(=O)OC[C@H](O)CO`
ZINC32840883 ZINC	0.628	302.5 Da LogP 3.58 TPSA 66.8	✓ Ro5	✓ Clean	`CCCCCCCCCCCCCC(=O)OC[C@@H](O)CO`
ZINC32840884 ZINC	0.628	302.5 Da LogP 3.58 TPSA 66.8	✓ Ro5	✓ Clean	`CCCCCCCCCCCCCC(=O)OC[C@H](O)CO`
ZINC32840889 ZINC	0.628	316.5 Da LogP 3.97 TPSA 66.8	✓ Ro5	✓ Clean	`CCCCCCCCCCCCCCC(=O)OC[C@@H](O)CO`
ZINC32840890 ZINC	0.628	316.5 Da LogP 3.97 TPSA 66.8	✓ Ro5	✓ Clean	`CCCCCCCCCCCCCCC(=O)OC[C@H](O)CO`
ZINC32840891 ZINC	0.628	330.5 Da LogP 4.36 TPSA 66.8	✓ Ro5	✓ Clean	`CCCCCCCCCCCCCCCC(=O)OC[C@@H](O)CO`
ZINC32840892 ZINC	0.628	330.5 Da LogP 4.36 TPSA 66.8	✓ Ro5	✓ Clean	`CCCCCCCCCCCCCCCC(=O)OC[C@H](O)CO`
ZINC38153421 ZINC	0.628	246.3 Da LogP 2.02 TPSA 66.8	✓ Ro5	✓ Clean	`CCCCCCCCCC(=O)OC[C@@H](O)CO`
ZINC72400435 ZINC	0.628	344.5 Da LogP 4.75 TPSA 66.8	✓ Ro5	✓ Clean	`CCCCCCCCCCCCCCCCC(=O)OC[C@@H](O)CO`
ZINC77313111 ZINC	0.628	344.5 Da LogP 4.75 TPSA 66.8	✓ Ro5	✓ Clean	`CCCCCCCCCCCCCCCCC(=O)OC[C@H](O)CO`
ZINC8437476 ZINC	0.628	274.4 Da LogP 2.80 TPSA 66.8	✓ Ro5	✓ Clean	`CCCCCCCCCCCC(=O)OC[C@H](O)CO`
ZINC8437478 ZINC	0.628	274.4 Da LogP 2.80 TPSA 66.8	✓ Ro5	✓ Clean	`CCCCCCCCCCCC(=O)OC[C@@H](O)CO`
ZINC8674155 ZINC	0.628	218.3 Da LogP 1.24 TPSA 66.8	✓ Ro5	✓ Clean	`CCCCCCCC(=O)OC[C@@H](O)CO`
ZINC95669489 ZINC	0.628	288.4 Da LogP 3.19 TPSA 66.8	✓ Ro5	✓ Clean	`CCCCCCCCCCCCC(=O)OC[C@H](O)CO`
ZINC95669491 ZINC	0.628	288.4 Da LogP 3.19 TPSA 66.8	✓ Ro5	✓ Clean	`CCCCCCCCCCCCC(=O)OC[C@@H](O)CO`
ZINC263614238 ZINC	0.627	470.5 Da LogP 3.32 TPSA 142.8	✓ Ro5	✓ Clean	`CC[C@H](C)CCCCCCCCCCC(=O)OC[C@H](O)CO[P@@](=O)(…`
ZINC38564715 ZINC	0.627	470.5 Da LogP 3.32 TPSA 142.8	✓ Ro5	✓ Clean	`CC[C@H](C)CCCCCCCCCCC(=O)OC[C@H](O)CO[P@@](=O)(…`
ZINC32840693 ZINC	0.620	425.5 Da LogP 3.68 TPSA 128.3	✓ Ro5	✓ Clean	`CCCCCCCCCCCCCC(=O)OC[C@H](O)CO[P@](=O)(O)OCCN`
ZINC32840705 ZINC	0.620	453.6 Da LogP 4.46 TPSA 128.3	✓ Ro5	✓ Clean	`CCCCCCCCCCCCCCCC(=O)OC[C@H](O)CO[P@](=O)(O)OCCN`
ZINC95635984 ZINC	0.620	397.4 Da LogP 2.90 TPSA 128.3	✓ Ro5	✓ Clean	`CCCCCCCCCCCC(=O)OC[C@@H](O)CO[P@@](=O)(O)OCCN`

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.

Sequence

UniProt A0A0H3GYI0