KpATCC43816 Protein target profile

nitrate ABC transporter, permease protein

Accession: VK055_0229

Gene: ntrB AIK78857.1 3D evidence: AlphaFold DB model + ColabFold model Metabolism Not in network UniProt A0A2W1A6D7
Length 294
Pocket druggability (P2Rank · AlphaFold DB model) 0.182
Functional annotation 0 EC 7 GO
Target summary

Target candidate with partial support; inspect missing evidence before prioritizing.

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
No hit
Gut microbiome similarity
1.3% of screened genomes Lower prevalence suggests narrower overlap with the screened gut microbiome.

Essentiality

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

Structure confidence

ColabFold pLDDT
88.53 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) 0.182
Structure A0A2W1A6D7
Pocket Pocket 1
Druggability (FPocket) 0.952
Structure A0A2W1A6D7
Pocket Pocket 3
ColabFold model
P2Rank 0.226 · Pocket 1
FPocket 0.959 · Pocket 2
Core conservation Conserved core gene
Roary core
CoreCruncher core
Gut microbiome 60 / 4744 genomes with a hit
Prevalence 1.3%

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.

MKQAQRKQPVVSVDNAPGEVIILPPVQVRRTTPTVTRWLRELTQRLLPPLLGLGVLLLAWQLAAMHSKGFPTPLSTLDSALTLFAEPFYQDGPNDMGIGWNVLASLQRVAVGFGLAALAGIPLGFLIGRSLFFARMFNPLIALLRPVSPLAWLPIGLLLFQKAEPASSWTIFICSIWPMVINTAEGVRRIPQDYLNVARVLQLSEWTVMRKILFPAVLPAVLTGVRLSIGIAWLVIVAAEMLTGGLGIGFWIWNEWNNLNVENIIIAIVIIGVVGLLLEQGLMLLARRFSWQEK

Functional annotations

Enzyme classification and Gene Ontology terms linked to this protein.

7 GO

Subcellular localization

Localization
CytoplasmicMembrane

Gene Ontology (GO)

7
  • GO:0016020 A lipid bilayer along with all the proteins and protein complexes embedded in it and attached to it.
  • GO:0015112 Enables the transfer of nitrate ions (NO3-) from one side of a membrane to the other.
  • GO:0015706 The directed movement of nitrate into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore.
  • 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:0042918 The directed movement of an alkanesulfonate into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore. Alkanesulfonates are organic esters or salts of sulfonic acid containing an aliphatic hydrocarbon radical.
  • GO:0006811 The directed movement of a monoatomic ion into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore. Monatomic ions (also called simple ions) are ions consisting of exactly one atom.

Sequence domains and features

Domain and signature matches imported from InterPro and related databases.

31 records
Show feature table
Start End DB Term Name
100 279 SUPERFAMILY SSF161098 MetI-like
100 279 InterPro IPR035906 MetI-like superfamily
120 277 Pfam PF00528 Binding-protein-dependent transport system inner membrane component
120 277 InterPro IPR000515 ABC transporter type 1, transmembrane domain MetI-like
86 280 NCBIfam TIGR01183 nitrate ABC transporter permease
86 280 InterPro IPR005889 Nitrate transport permease
166 184 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
231 252 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
106 128 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
28 290 PANTHER PTHR30151 ALKANE SULFONATE ABC TRANSPORTER-RELATED, MEMBRANE SUBUNIT
109 128 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
231 253 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
263 285 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
95 289 FunFam G3DSA:1.10.3720.10:FF:000003 Aliphatic sulfonate ABC transporter permease
105 250 CDD cd06261 TM_PBP2
105 250 InterPro IPR000515 ABC transporter type 1, transmembrane domain MetI-like
46 65 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
140 160 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
287 294 Phobius CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the cytoplasm.
64 108 Phobius NON_CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the extracellular region.
253 263 Phobius NON_CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the extracellular region.
46 63 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
102 286 ProSiteProfiles PS50928 ABC transporter integral membrane type-1 domain profile.
102 286 InterPro IPR000515 ABC transporter type 1, transmembrane domain MetI-like
264 286 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
100 288 Gene3D G3DSA:1.10.3720.10 -
100 288 InterPro IPR035906 MetI-like superfamily
1 45 Phobius CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the cytoplasm.
129 139 Phobius CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the cytoplasm.
161 165 Phobius NON_CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the extracellular region.
185 230 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
0.182
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Surrounding area
Pocket 2 P2Rank #2
0.164
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Surrounding area
Pocket 3 P2Rank #3
0.128
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Surrounding area
Pocket 4 P2Rank #4
0.019
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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 #3
0.952 Unusual size
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Surrounding area
Pocket 2 FPocket #15
0.886
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Surrounding area
Pocket 3 FPocket #19
0.285
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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_A0A2W1A6D7
AlphaFold DB full sequence Viewing
ColabFold VK055_0229
ColabFold full sequence Loaded

Cross-references

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