Protein target profile

VK055_0600

respiratory nitrate reductase, gamma subunit

Genome: KpATCC43816 Gene: AIK79223.1 narI2 3D evidence: AlphaFold DB model + ColabFold model Metabolism 2 reactions UniProt A0A0H3GTE7
Length 226
Pocket druggability 0.999
Metabolic reactions 2
Chokepoint No
Direct ligand evidence 0 57 total records
Functional annotation 1 EC 9 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
No hit
Gut microbiome similarity
2.2% of screened genomes Lower prevalence suggests narrower overlap with the screened gut microbiome.

Essentiality

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

Localization

Localization
CytoplasmicMembrane

Structure confidence

ColabFold pLDDT
96.87 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 0.999
Structure A0A0H3GTE7
Pocket Pocket 15
P2Rank 0.998
Structure A0A0H3GTE7
Pocket Pocket 1
ColabFold model
FPocket 0.996 · Pocket 15
P2Rank 0.998 · Pocket 1
Core conservation Conserved core gene
Roary core
CoreCruncher core
Gut microbiome 106 / 4744 genomes with a hit
Prevalence 2.2%

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

Metabolic context: no human homolog detected.

Relative network centrality 0.0% more central than 0.0% of genes in this genome
Chokepoint Not a chokepoint
Catalyzed reactions

2 reactions 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.

MIQYLNVFFYDIYPYLCGTVFLVGSWLRYDYGQYTWRASSSQMLDKRGMVLWSNLFHIGILGIFFGHLFGMLTPHWVYSWFLPMSQKQLMAMILGGICGVLTLVGGIGLLMRRLTNPRIRATSTTADILILCILLIQCALGLTTIPFSAQHPDGSEMLKLVDWAQAVVTFHGGASAHLDGVAWIYRVHLVLGMTIFLIFPFTRLVHVWSAPVEYFTRRYQVVRSRR

Functional annotations

Enzyme classification and Gene Ontology terms linked to this protein.

1 EC 9 GO

Enzyme Commission (EC)

1

Gene Ontology (GO)

9
  • GO:0009325 An enzyme complex that catalyzes the formation of nitrate from nitrite with the concomitant reduction of an acceptor.
  • GO:0008940 Catalysis of the reaction: nitrite + acceptor = nitrate + reduced acceptor.
  • 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:0009055 A molecular function representing the directed movement of electrons from one molecular entity to another, typically mediated by electron carriers or acceptors, resulting in the transfer of energy and/or the reduction-oxidation (redox) transformation of chemical species. This activity is fundamental to various biological processes, including cellular respiration and photosynthesis, as well as numerous enzymatic reactions involved in metabolic pathways.
  • GO:0020037 Binding to a heme, a compound composed of iron complexed in a porphyrin (tetrapyrrole) ring.
  • GO:0046872 Binding to a metal ion.
  • GO:0160182 Catalysis of the reaction: a quinol + nitrate = a quinone + H2O + nitrite.
  • GO:0019645 A process in which a series of electron carriers operate together to transfer electrons from donors such as NADH and FADH2 to any of several different terminal electron acceptors other than oxygen to generate a transmembrane electrochemical gradient.
  • GO:0042128 The nitrogen metabolic process that encompasses the uptake of nitrate from the environment and reduction to ammonia, and results in the incorporation of nitrogen derived from nitrate into cellular substances.

Sequence domains and features

Domain and signature matches imported from InterPro and related databases.

25 records
Show feature table
Start End DB Term Name
89 107 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
3 225 SUPERFAMILY SSF103501 Respiratory nitrate reductase 1 gamma chain
3 225 InterPro IPR036197 NarG-like superfamily
128 150 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
50 69 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
185 207 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
89 111 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
30 49 Phobius CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the cytoplasm.
1 11 Phobius NON_CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the extracellular region.
70 88 Phobius NON_CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the extracellular region.
128 149 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
2 217 FunFam G3DSA:1.20.950.20:FF:000001 Respiratory nitrate reductase subunit gamma
202 226 Phobius CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the cytoplasm.
183 201 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
2 217 Gene3D G3DSA:1.20.950.20 -
3 226 PANTHER PTHR30598 NITRATE REDUCTASE PRIVATE CHAPERONE, REDOX ENZYME MATURATION PROTEIN REMP FAMILY
150 182 Phobius NON_CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the extracellular region.
108 127 Phobius CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the cytoplasm.
50 69 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
12 29 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
10 29 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
6 225 Pfam PF02665 Nitrate reductase gamma subunit
6 225 InterPro IPR023234 NarG-like domain
2 226 NCBIfam TIGR00351 respiratory nitrate reductase subunit gamma
2 226 InterPro IPR003816 Nitrate reductase, gamma subunit

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 #15
0.999
Likely same site as P2Rank 1 5.6 Å 46 shared residues 85% of smaller site
Unusual size
Show in viewer
Surrounding area
Site 2 FPocket #14
0.754
Unusual size
Show in viewer
Surrounding area

Binding pockets · P2Rank

Probability: high ≥ 0.5 · medium 0.2–0.49 · low < 0.2

Site 1 P2Rank #1
0.998
Likely same site as FPocket 15 5.6 Å 46 shared residues 85% of smaller site
Show in viewer
Surrounding area
Residue sets
UniProt: Binding site:188-188 axial binding residue
UniProt: Binding site:206-206 axial binding residue
UniProt: Binding site:57-57 axial binding residue
UniProt: Binding site:67-67 axial binding residue
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_A0A0H3GTE7
AlphaFold DB full sequence Viewing
ColabFold VK055_0600
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.

57 records
Chemistry signal

Structural ligand evidence is available for this target.

Direct evidence 0 same-protein records
Transferred evidence 7 records from similar proteins
Structural ligands 7 0 loaded crystals
Measured bioactivity 0 direct and transferred ChEMBL records
Proposed compounds 50 similarity-based ZINC candidates
Best available ligand signal
3PH PDB via homolog 705.0 Da · LogP 12.07 · TPSA 119.4 Open detail RCSB PDB
6MO PDB via homolog Detail RCSB PDB
AGA PDB via homolog Detail RCSB PDB
F3S PDB via homolog Detail RCSB PDB
MD1 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
3PH RCSB PDB P11350 705.0 Da LogP 12.07 TPSA 119.4 2 viol. ✓ Clean CCCCCCCCCCCCCCCCCC(=O)OC[C@H](COP(=O)(O)O)OC(=O…
6MO RCSB PDB P11350 95.9 Da LogP -0.00 TPSA 0.0 ✓ Ro5 ✓ Clean [Mo+6]
AGA RCSB PDB P11350 455.5 Da LogP 1.85 TPSA 151.7 ✓ Ro5 ✓ Clean CCCCCCCC(=O)O[C@H](COC(=O)CCCC)COP(=O)([O-])OC[…
F3S RCSB PDB P11350 295.8 Da LogP 2.59 TPSA 0.0 ✓ Ro5 ✓ Clean S1[Fe]2S[Fe]3[S]2[Fe]1S3
MD1 RCSB PDB P11350 740.6 Da LogP -2.13 TPSA 358.0 3 viol. ✓ Clean c1nc2c(n1[C@H]3[C@@H]([C@@H]([C@H](O3)CO[P@](=O…
MGD RCSB PDB P11350 740.6 Da LogP -2.06 TPSA 346.6 3 viol. ✓ Clean c1nc2c(n1[C@H]3[C@@H]([C@@H]([C@H](O3)CO[P@@](=…
PCI RCSB PDB P11350 266.3 Da LogP 4.66 TPSA 20.2 ✓ Ro5 ✓ Clean c1(c(c(c(c(c1Cl)Cl)Cl)Cl)Cl)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.