KpATCC43816 Protein target profile

succinate dehydrogenase, cytochrome b556 subunit

Accession: VK055_1800

Gene: sdhC AIK80413.1 3D evidence: AlphaFold DB model + ColabFold model Metabolism 1 reaction UniProt A0A0H3GQ10
Length 91
Pocket druggability (P2Rank · AlphaFold DB model) 0.029
Metabolic reactions 1
Chokepoint No
Direct ligand evidence 0 61 total records
Functional annotation 0 EC 7 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
2.6% of screened genomes Lower prevalence suggests narrower overlap with the screened gut microbiome.

Essentiality

Essential (DEG)
Y
DEG identity (%)
57.778 Higher values support similarity to known essential genes.
DEG E-value
4.52e-28 Smaller values mean stronger essential-gene similarity.

Structure confidence

ColabFold pLDDT
97.38 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) 0.029
Structure A0A0H3GQ10
Pocket Pocket 1
Druggability (FPocket) 0.906
Structure A0A0H3GQ10
Pocket Pocket 1
ColabFold model
P2Rank 0.043 · Pocket 1
FPocket 0.674 · Pocket 1
Core conservation Accessory gene
Roary core
CoreCruncher accessory
Gut microbiome 122 / 4744 genomes with a hit
Prevalence 2.6%

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
Pathways

No specific KEGG pathway assigned - this reaction either has no KEGG mapping, or only matches a generic overview map with no route-level information.

Catalyzed reaction

1 reaction 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.

MAVGILLWLLGTSLSSPEGFLTAASIMDSFFVKFIMWGILTALAYHVVVGIRHLMMDFGYLDETLEAGKRSAKISFVITVVLSLLAGVLVW

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:0016627 Catalysis of an oxidation-reduction (redox) reaction in which a CH-CH group acts as a hydrogen or electron donor and reduces a hydrogen or electron acceptor.
  • GO:0045281 OBSOLETE. A multimeric complex which consists of flavoprotein (subunit A ; InterPro:IPR003952), iron-sulfur protein (subunit B) and membrane-bound cytochrome b560 (subunit C; InterPro:IPR000701). In some Archaea, the membrane-bound subunits (C or C and D) do not necessarily contain heme. Membrane-bound subunits can bind or react with quinones.
  • 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:0000104 Catalysis of the reaction: succinate + acceptor = fumarate + reduced acceptor.
  • GO:0006099 A nearly universal metabolic pathway in which the acetyl group of acetyl coenzyme A is effectively oxidized to two CO2 and four pairs of electrons are transferred to coenzymes. The acetyl group combines with oxaloacetate to form citrate, which undergoes successive transformations to isocitrate, 2-oxoglutarate, succinyl-CoA, succinate, fumarate, malate, and oxaloacetate again, thus completing the cycle. In eukaryotes the tricarboxylic acid is confined to the mitochondria. See also glyoxylate cycle.
  • GO:0046872 Binding to a metal ion.

Sequence domains and features

Domain and signature matches imported from InterPro and related databases.

26 records
Show feature table
Start End DB Term Name
71 90 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
1 15 SignalP_EUK SignalP-TM SignalP-TM
3 91 SUPERFAMILY SSF81343 Fumarate reductase respiratory complex transmembrane subunits
3 91 InterPro IPR034804 Fumarate reductase/succinate dehydrogenase, transmembrane subunit
31 51 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
16 30 Phobius NON_CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the extracellular region.
2 88 NCBIfam TIGR02970 succinate dehydrogenase, cytochrome b556 subunit
2 88 InterPro IPR014314 Succinate dehydrogenase, cytochrome b556 subunit
5 27 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
11 15 Phobius SIGNAL_PEPTIDE_C_REGION C-terminal region of a signal peptide.
1 15 Phobius SIGNAL_PEPTIDE Signal peptide region
2 88 CDD cd03499 SQR_TypeC_SdhC
91 91 Phobius NON_CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the extracellular region.
34 56 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
1 1 Phobius SIGNAL_PEPTIDE_N_REGION N-terminal region of a signal peptide.
1 91 PIRSF PIRSF000178 SDH_cyt_b560
1 91 InterPro IPR014314 Succinate dehydrogenase, cytochrome b556 subunit
72 90 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
4 85 Pfam PF01127 Succinate dehydrogenase/Fumarate reductase transmembrane subunit
4 85 InterPro IPR000701 Succinate dehydrogenase/fumarate reductase type B, transmembrane subunit
46 59 ProSitePatterns PS01001 Succinate dehydrogenase cytochrome b subunit signature 2.
46 59 InterPro IPR018495 Succinate dehydrogenase, cytochrome b subunit, conserved site
52 71 Phobius CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the cytoplasm.
2 10 Phobius SIGNAL_PEPTIDE_H_REGION Hydrophobic region of a signal peptide.
1 91 Gene3D G3DSA:1.20.1300.10 Fumarate reductase/succinate dehydrogenase, transmembrane subunit
1 91 InterPro IPR034804 Fumarate reductase/succinate dehydrogenase, transmembrane 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
0.029
Show in viewer
Surrounding area
Pocket 2 P2Rank #2
0.005
Show in viewer
Surrounding area

Binding pockets · FPocket

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

Pocket 1 FPocket #1
0.906
Show in viewer
Surrounding area
Residue sets
UniProt: Binding site:46-46 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_A0A0H3GQ10
AlphaFold DB full sequence Viewing
ColabFold VK055_1800
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.

61 records
Chemistry signal

Structural ligand evidence is available for this target.

Direct evidence 0 same-protein records
Transferred evidence 11 records from similar proteins
Structural ligands 11 0 loaded crystals
Measured bioactivity 0 direct and transferred ChEMBL records
Proposed compounds 50 similarity-based ZINC candidates
Best available ligand signal
AT5 PDB via homolog 366.2 Da · LogP 2.79 · TPSA 88.6 Open detail RCSB PDB
CBE PDB via homolog Detail RCSB PDB
CDN PDB via homolog Detail RCSB PDB
DNT PDB via homolog Detail RCSB PDB
EPH 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
AT5 RCSB PDB P69054 366.2 Da LogP 2.79 TPSA 88.6 ✓ Ro5 ✓ Clean C[C@@H](C[C@H](C)C(=O)C1=C(C(=C(NC1=O)OC)OC)O)[…
CBE RCSB PDB P69054 235.3 Da LogP 2.62 TPSA 38.3 ✓ Ro5 ✓ Clean CC1=C(SCCO1)C(=O)Nc2ccccc2
CDN RCSB PDB P69054 1151.5 Da LogP 14.77 TPSA 249.6 4 viol. ✓ Clean CCCCCCCCCCCCCCC(O)O[C@H](COC(CCCCC)O)CO[P@@](=O…
DNT RCSB PDB P69054 282.3 Da LogP 3.89 TPSA 106.5 ✓ Ro5 ✓ Clean CCCCCC(C)c1cc(cc(c1O)[N+](=O)[O-])[N+](=O)[O-]
EPH RCSB PDB P69054 709.9 Da LogP 10.16 TPSA 134.4 2 viol. ✓ Clean CCCC=CCC=CCCCCCCCC(=O)O[C@H](COC(=O)CCCCCCC=CCC…
F3S RCSB PDB P69054 295.8 Da LogP 2.59 TPSA 0.0 ✓ Ro5 ✓ Clean S1[Fe]2S[Fe]3[S]2[Fe]1S3
FES RCSB PDB P69054 175.8 Da LogP 1.29 TPSA 0.0 ✓ Ro5 ✓ Clean S1[Fe]S[Fe]1
OAA RCSB PDB P69054 131.1 Da LogP -2.22 TPSA 94.5 ✓ Ro5 ✓ Clean C(C(=O)C(=O)O)C(=O)[O-]
PCI RCSB PDB P69054 266.3 Da LogP 4.66 TPSA 20.2 ✓ Ro5 ✓ Clean c1(c(c(c(c(c1Cl)Cl)Cl)Cl)Cl)O
TEO RCSB PDB P69054 132.1 Da LogP -3.14 TPSA 103.7 ✓ Ro5 ✓ Clean C(=C(\O)/[O-])\[C@H](C(=O)[O-])O
UQ2 RCSB PDB P69054 318.4 Da LogP 4.04 TPSA 52.6 ✓ Ro5 Alert CC1=C(C(=O)C(=C(C1=O)OC)OC)C\C=C(/C)\CCC=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.