KpATCC43816 Protein target profile

hydrogenase 4, large subunit

Accession: VK055_4456

Gene: hyfG AIK82999.1 3D evidence: AlphaFold DB model + ColabFold model Metabolism Not in network UniProt A0A0H3H1X8
Length 569
Pocket druggability (P2Rank · AlphaFold DB model) 0.887
Direct ligand evidence 0 79 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 (%)
29.851 Lower values reduce human off-target concern.
Human E-value
7.38e-09
Gut microbiome similarity
11.1% of screened genomes Lower prevalence suggests narrower overlap with the screened gut microbiome.

Essentiality

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

Structure confidence

ColabFold pLDDT
92.12 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) 0.887
Structure A0A0H3H1X8
Pocket Pocket 1
Druggability (FPocket) 0.827
Structure A0A0H3H1X8
Pocket Pocket 3
ColabFold model
P2Rank 0.698 · Pocket 1
FPocket 0.063 · Pocket 17
Core conservation Conserved core gene
Roary core
CoreCruncher core
Gut microbiome 528 / 4744 genomes with a hit
Prevalence 11.1%

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.

MSEEKIGQHYLAALHQAFPGVVLDEAWQTKDQLTITVKVNYLPEVVEFLYYQQGGWLSVLFGNDERKLNGHYAVYYVLSMEQGTKCWITVRVEVDANKPEYPSVTPRVPAAVWGEREVRDMYGLVPVGLPDERRLVLPDDWPDELYPLRKDSMDYRQRPAPTTDAETYEFINELGSKKNNVVPIGPLHVTSDEPGHFRLFVDGENIIDADYRLFYVHRGMEKLAETRMGYNEVTFLSDRVCGICGFAHSTAYTTSVENAMGIVVPERAQMIRAILLEVERLHSHLLNLGLACHFTGFDSGFMQFFRVRETSMKMAEILTGARKTYGLNLIGGIRRDLLKEDMIQTRQLAQQMRRDVQELVDMLLSTPNIEQRTVGIGRLDPEIARDFSNVGPMVRASGHARDTRADHPFVGYGLLPMEVHSEQGCDVISRLKVRINEVYTALNMIDFGLDNLPGGPLMVEGFTYIPHRFALGFSEAPRGDDIHWSMTGDNQKLYRWRCRAATYANWPTLRYMLRGNTVSDAPLIIGSLDPCYSCTDRMTVVDVRKKKSKVVSYKELERYSIERKNSPLK

Functional annotations

Enzyme classification and Gene Ontology terms linked to this protein.

6 GO

Subcellular localization

Localization
Cytoplasmic

Gene Ontology (GO)

6
  • GO:0048038 Binding to a quinone, any member of a class of diketones derivable from aromatic compounds by conversion of two CH groups into CO groups with any necessary rearrangement of double bonds.
  • GO:0008137 Catalysis of the reaction: NADH + ubiquinone + 5 H+(in) = NAD+ + ubiquinol + 4 H+(out).
  • GO:0016651 Catalysis of an oxidation-reduction (redox) reaction in which NADH or NADPH acts as a hydrogen or electron donor and reduces a hydrogen or electron acceptor.
  • GO:0051287 Binding to nicotinamide adenine dinucleotide, a coenzyme involved in many redox and biosynthetic reactions; binding may be to either the oxidized form, NAD+, or the reduced form, NADH.
  • GO:0016151 Binding to a nickel (Ni) cation.
  • GO:0051539 Binding to a 4 iron, 4 sulfur (4Fe-4S) cluster; this cluster consists of four iron atoms, with the inorganic sulfur atoms found between the irons and acting as bridging ligands.

Sequence domains and features

Domain and signature matches imported from InterPro and related databases.

21 records
Show feature table
Start End DB Term Name
180 537 FunFam G3DSA:1.10.645.10:FF:000004 Hydrogenase 3, large subunit
218 286 Pfam PF00374 Nickel-dependent hydrogenase
218 286 InterPro IPR001501 Nickel-dependent hydrogenase, large subunit
14 546 PANTHER PTHR43485 HYDROGENASE-4 COMPONENT G
2 134 FunFam G3DSA:3.30.460.80:FF:000003 Formate hydrogenlyase subunit 5
193 537 SUPERFAMILY SSF56762 HydB/Nqo4-like
193 537 InterPro IPR029014 [NiFe]-hydrogenase, large subunit
36 152 Pfam PF00329 Respiratory-chain NADH dehydrogenase, 30 Kd subunit
36 152 InterPro IPR001268 NADH:ubiquinone oxidoreductase, 30kDa subunit
296 464 Pfam PF00346 Respiratory-chain NADH dehydrogenase, 49 Kd subunit
296 464 InterPro IPR001135 NADH-quinone oxidoreductase, subunit D
466 537 Pfam PF00346 Respiratory-chain NADH dehydrogenase, 49 Kd subunit
466 537 InterPro IPR001135 NADH-quinone oxidoreductase, subunit D
9 194 SUPERFAMILY SSF143243 Nqo5-like
9 194 InterPro IPR037232 NADH:ubiquinone oxidoreductase, 30kDa subunit superfamily
216 227 ProSitePatterns PS00535 Respiratory chain NADH dehydrogenase 49 Kd subunit signature.
216 227 InterPro IPR014029 NADH:ubiquinone oxidoreductase, 49kDa subunit, conserved site
2 134 Gene3D G3DSA:3.30.460.80 NADH:ubiquinone oxidoreductase, 30kDa subunit
2 134 InterPro IPR037232 NADH:ubiquinone oxidoreductase, 30kDa subunit superfamily
180 537 Gene3D G3DSA:1.10.645.10 -
180 537 InterPro IPR029014 [NiFe]-hydrogenase, large 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 · P2Rank

Druggability (P2Rank): high ≥ 0.5 · medium 0.2–0.49 · low < 0.2

Pocket 1 P2Rank #1
0.887
Likely same site as FPocket 3 1.5 Å 16 shared residues 100% of smaller site
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Surrounding area
Pocket 2 P2Rank #2
0.721
Show in viewer
Surrounding area
Pocket 3 P2Rank #3
0.624
Show in viewer
Surrounding area
Pocket 4 P2Rank #4
0.372
Show in viewer
Surrounding area
Pocket 5 P2Rank #5
0.091
Show in viewer
Surrounding area

Binding pockets · FPocket

Druggability (FPocket): high ≥ 0.7 · medium 0.4–0.69 · low < 0.4

Pocket 1 FPocket #3
0.827
Likely same site as P2Rank 1 1.5 Å 16 shared residues 100% of smaller site
Show in viewer
Surrounding area
Residue sets
UniProt: Binding site:221-221
UniProt: Binding site:241-241
UniProt: Binding site:244-244
UniProt: Binding site:531-531
UniProt: Binding site:534-534
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_A0A0H3H1X8
AlphaFold DB full sequence Viewing
ColabFold VK055_4456
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.

79 records
Chemistry signal

Structural ligand evidence is available for this target.

Direct evidence 0 same-protein records
Transferred evidence 29 records from similar proteins
Structural ligands 29 0 loaded crystals
Measured bioactivity 0 direct and transferred ChEMBL records
Proposed compounds 50 similarity-based ZINC candidates
Best available ligand signal
3PE PDB via homolog 748.1 Da · LogP 12.06 · TPSA 134.4 Open detail RCSB PDB
BCR PDB via homolog Detail RCSB PDB
CDL PDB via homolog Detail RCSB PDB
CPL PDB via homolog Detail RCSB PDB
DCQ 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
3PE RCSB PDB F2Z626 748.1 Da LogP 12.06 TPSA 134.4 2 viol. ✓ Clean CCCCCCCCCCCCCCCCCC(=O)OC[C@H](COP(=O)(O)OCCN)OC…
BCR RCSB PDB Q8DJD9 536.9 Da LogP 12.61 TPSA 0.0 2 viol. ✓ Clean CC1=C(C(CCC1)(C)C)\C=C\C(=C\C=C\C(=C\C=C\C=C(/C…
CDL RCSB PDB W5PJ73 1464.1 Da LogP 23.31 TPSA 242.6 3 viol. ✓ Clean CCCCCCCCCCCCCCCCCC(=O)OC[C@H](COP(=O)([O-])OCC(…
CPL RCSB PDB F2Z626 758.1 Da LogP 10.94 TPSA 111.2 2 viol. ✓ Clean CCCCCCCCCCCCCCCC(=O)OC[C@H](CO[P@@](=O)([O-])OC…
DCQ RCSB PDB Q56220 322.4 Da LogP 4.49 TPSA 52.6 ✓ Ro5 Alert CCCCCCCCCCC1=C(C(=O)C(=C(C1=O)OC)OC)C
DGD RCSB PDB Q8DJD9 949.3 Da LogP 7.61 TPSA 231.1 4 viol. ✓ Clean CCCCCCCCCCCCCCCCCC(=O)OC[C@H](CO[C@H]1[C@@H]([C…
EHZ RCSB PDB F2Z626 584.7 Da LogP 3.04 TPSA 182.5 2 viol. ✓ Clean CCCCCCCCCCC[C@@H](CC(=O)SCCNC(=O)CCNC(=O)[C@@H]…
FES RCSB PDB Q8DJD9 175.8 Da LogP 1.29 TPSA 0.0 ✓ Ro5 ✓ Clean S1[Fe]S[Fe]1
HQH RCSB PDB Q56220 415.6 Da LogP 5.05 TPSA 71.6 1 viol. ✓ Clean C/C=C(\C)/[C@@H]([C@H](C)/C=C(\C)/C=C/C/C(=C/CC…
HQK RCSB PDB Q56220 364.9 Da LogP 5.24 TPSA 34.9 1 viol. ✓ Clean CC(C)(C)c1ccc(cc1)CSC2=C(C(=O)N(N=C2)C(C)(C)C)Cl
HQW RCSB PDB Q56220 397.4 Da LogP 4.66 TPSA 91.8 ✓ Ro5 ✓ Clean CC1=C(OC(=C(C1=O)C)OC)[C@H]2C/C(=C/C(=C/c3ccc(c…
LHG RCSB PDB Q8DJD9 723.0 Da LogP 9.89 TPSA 148.8 2 viol. ✓ Clean CCCCCCCCCCCCCCCC(=O)OC[C@H](CO[P@@](=O)(O)OC[C@…
LMG RCSB PDB Q8DJD9 787.2 Da LogP 9.78 TPSA 152.0 2 viol. ✓ Clean CCCCCCCCCCCCCCCCCC(=O)OC[C@H](CO[C@H]1[C@@H]([C…
LMN RCSB PDB F2Z626 1005.2 Da LogP -1.68 TPSA 357.1 3 viol. ✓ Clean CCCCCCCCCCC(CCCCCCCCCC)(CO[C@@H]1[C@@H]([C@@H](…
LMT RCSB PDB F2Z626 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…
NFU RCSB PDB Q8U0Z6 195.6 Da LogP -0.25 TPSA 64.7 ✓ Ro5 ✓ Clean C(=O)[Fe](C#N)(C#N)[Ni]
PC1 RCSB PDB W5PJ73 790.2 Da LogP 12.17 TPSA 111.2 2 viol. ✓ Clean CCCCCCCCCCCCCCCCCC(=O)OC[C@H](CO[P@@](=O)([O-])…
PGT RCSB PDB Q8DJD9 751.0 Da LogP 10.67 TPSA 148.8 2 viol. ✓ Clean CCCCCCCCCCCCCCCCCC(=O)O[C@@H](COC(=O)CCCCCCCCCC…
PL9 RCSB PDB Q8DJD9 749.2 Da LogP 16.57 TPSA 34.1 2 viol. Alert CC1=C(C(=O)C(=CC1=O)CC=C(C)CCC=C(C)CCC=C(C)CCC=…
PLC RCSB PDB F2Z626 622.8 Da LogP 8.12 TPSA 108.4 2 viol. ✓ Clean CCCCCCCCCCCC(=O)OC[C@H](CO[P@](=O)(O)OCC[N+](C)…
PNS RCSB PDB W5PJ73 358.4 Da LogP -0.96 TPSA 145.2 1 viol. ✓ Clean CC(C)(COP(=O)(O)O)[C@H](C(=O)NCCC(=O)NCCS)O
PQN RCSB PDB Q8DJD9 450.7 Da LogP 9.16 TPSA 34.1 1 viol. Alert CC1=C(C(=O)c2ccccc2C1=O)C\C=C(/C)\CCC[C@H](C)CC…
PSC RCSB PDB F2Z626 759.1 Da LogP 11.58 TPSA 108.4 2 viol. ✓ Clean CCCCCCCCCCCCCCCC(=O)OC[C@H](CO[P@@](=O)(O)OCC[N…
SMA RCSB PDB Q56220 514.7 Da LogP 6.14 TPSA 87.4 2 viol. ✓ Clean C/C=C(\C)/C=C/C=C[C@@H]([C@@H](C)[C@H]([C@@H](C…
SQD RCSB PDB Q8DJD9 795.1 Da LogP 8.12 TPSA 186.1 3 viol. ✓ Clean CCCCCCCCCCCCCCCC(=O)OC[C@H](COC1[C@@H]([C@H]([C…
T7X RCSB PDB F2Z626 887.1 Da LogP 9.17 TPSA 209.5 4 viol. ✓ Clean CCCCCCCCCCCCCCCCCC(=O)OC[C@H](COP(=O)(O)OC1[C@@…
UQ1 RCSB PDB Q56220 250.3 Da LogP 2.32 TPSA 52.6 ✓ Ro5 Alert CC1=C(C(=O)C(=C(C1=O)OC)OC)CC=C(C)C
UQ9 RCSB PDB F2Z626 795.2 Da LogP 16.13 TPSA 52.6 2 viol. Alert CC1=C(C(=O)C(=C(C1=O)OC)OC)C\C=C(/C)\CC\C=C(/C)…
ZMP RCSB PDB F2Z626 568.7 Da LogP 4.07 TPSA 162.3 1 viol. ✓ Clean CCCCCCCCCCCCCC(=O)SCCNC(=O)CCNC(=O)[C@H](C(C)(C…

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.