KpATCC43816 Protein target profile
bacterial extracellular solute-binding family protein
Accession: VK055_4265
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.
Main supporting evidence
Risks to review
Evidence coverage
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
- 0.9% of screened genomes Lower prevalence suggests narrower overlap with the screened gut microbiome.
Essentiality
- Essential (DEG)
- N
- DEG identity (%)
- 26.923 Higher values support similarity to known essential genes.
Structure confidence
- ColabFold pLDDT
- 94.04 0-100 confidence; >70 supports local structural interpretation.
Binding-site evidence
AlphaFold DB / UniProt modelP2Rank'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.
Sequence
Primary amino-acid sequence viewer.
MKNVLISATLSATLGLSAFSSLAQDVDLRMSWWGGNGRHQVTLKALEEFHKQHPDINVKAEYTGWDGHLSRLTTQIAGGTEPDVMQTNWNWLPIFSKNGDGFYDLNTLKDEIDLSQFDAKELQSTTVNGKLNGIPISVTARVFYFNDEAWKKAGIPFPKTWDELMAAGKTFESKLGKQYYPVVLEHQDVLALLNSYMVQKYNQPAIDEKGRKFSYSKAQWADFFGMYKKLIDSHVMPDTRYYASFGKSNMYEMKPWIQGEWGGTYMWNSTINKYSDNLKPPAKLVLGEYPMLPGATDAGLFFKPAQMLSIGKSTKNPQAAAKVINFLLNSKEGVDILGLERGVPLSKAAVTYLTEDGVIKADDPAVSGLKLAQSLPTALPVSPYFDDPQIVAQFGTTLQYIDYGKKSVEEAAEDFQRQTDRILRRAMR
Functional annotations
Enzyme classification and Gene Ontology terms linked to this protein.
Subcellular localization
- Localization
- Unknown
Gene Ontology (GO)
1- GO:0030288 The region between the inner (cytoplasmic or plasma) membrane and outer membrane of organisms with two membranes such as Gram negative bacteria. These periplasmic spaces are relatively thick and contain a thin peptidoglycan layer (PGL), also referred to as a thin cell wall.
Sequence domains and features
Domain and signature matches imported from InterPro and related databases.
Show feature table
| Start | End | DB | Term | Name |
|---|---|---|---|---|
| 24 | 423 | SUPERFAMILY | SSF53850 | Periplasmic binding protein-like II |
| 4 | 15 | Phobius | SIGNAL_PEPTIDE_H_REGION | Hydrophobic region of a signal peptide. |
| 1 | 23 | Phobius | SIGNAL_PEPTIDE | Signal peptide region |
| 4 | 344 | PANTHER | PTHR43649 | ARABINOSE-BINDING PROTEIN-RELATED |
| 137 | 415 | Gene3D | G3DSA:3.40.190.10 | - |
| 1 | 23 | SignalP_GRAM_POSITIVE | SignalP-TM | SignalP-TM |
| 16 | 23 | Phobius | SIGNAL_PEPTIDE_C_REGION | C-terminal region of a signal peptide. |
| 45 | 331 | Pfam | PF01547 | Bacterial extracellular solute-binding protein |
| 45 | 331 | InterPro | IPR006059 | Bacterial extracellular solute-binding protein |
| 28 | 371 | Gene3D | G3DSA:3.40.190.10 | - |
| 24 | 428 | Phobius | NON_CYTOPLASMIC_DOMAIN | Region of a membrane-bound protein predicted to be outside the membrane, in the extracellular region. |
| 1 | 3 | Phobius | SIGNAL_PEPTIDE_N_REGION | N-terminal region of a signal peptide. |
| 1 | 23 | SignalP_GRAM_NEGATIVE | SignalP-noTM | SignalP-noTM |
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.
How colors and pocket overlays are used
Pocket details Inspect a specific pocket, or open the full viewer
- Method
- -
- Score
- -
- Visible layer
- -
- Residues
- -
- Pocket properties
- -
Selecting a pocket opens its details and centers the viewer without clearing other active layers. Use Focus this pocket when you want to hide the rest; use Surface for the wider residue environment.
Binding pockets · P2Rank
Druggability (P2Rank): high ≥ 0.5 · medium 0.2–0.49 · low < 0.2
Binding pockets · FPocket
Druggability (FPocket): high ≥ 0.7 · medium 0.4–0.69 · low < 0.4
Binding pockets · P2Rank
Druggability (P2Rank): high ≥ 0.5 · medium 0.2–0.49 · low < 0.2
Binding pockets · FPocket
Druggability (FPocket): high ≥ 0.7 · medium 0.4–0.69 · low < 0.4
All structural evidence
Structural evidence
0 + 2Experimental 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_A0A0H3GX53
|
AlphaFold DB | — | — | full sequence | — | Viewing |
|
ColabFold
VK055_4265
|
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.
Structural ligand evidence is available for this target.
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.
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 |
|---|---|---|---|---|---|
| ZINC100055151 ZINC | 0.569 | 488.4 Da LogP -6.55 TPSA 248.4 | 2 viol. | ✓ Clean |
C[C@@H]1O[C@H](O[C@H]2[C@H](O[C@@H]3[C@@H](CO)O…
|
| ZINC100055153 ZINC | 0.569 | 488.4 Da LogP -6.55 TPSA 248.4 | 2 viol. | ✓ Clean |
C[C@@H]1O[C@H](O[C@H]2[C@H](O[C@@H]3[C@@H](CO)O…
|
| ZINC100055156 ZINC | 0.569 | 488.4 Da LogP -6.55 TPSA 248.4 | 2 viol. | ✓ Clean |
C[C@@H]1O[C@H](O[C@H]2[C@@H](O)[C@@H](CO)O[C@@H…
|
| ZINC100055157 ZINC | 0.569 | 488.4 Da LogP -6.55 TPSA 248.4 | 2 viol. | ✓ Clean |
C[C@@H]1O[C@H](O[C@H]2[C@@H](O)[C@@H](CO)O[C@@H…
|
| ZINC2362797719 ZINC | 0.569 | 488.4 Da LogP -6.55 TPSA 248.4 | 2 viol. | ✓ Clean |
C[C@@H]1O[C@@H](O[C@H]2[C@H](O[C@H]3[C@@H](O)[C…
|
| ZINC55537584 ZINC | 0.569 | 488.4 Da LogP -6.55 TPSA 248.4 | 2 viol. | ✓ Clean |
C[C@@H]1O[C@@H](O[C@H]2[C@H](O[C@@H]3[C@@H](CO)…
|
| ZINC103664702 ZINC | 0.549 | 488.4 Da LogP -6.55 TPSA 248.4 | 2 viol. | ✓ Clean |
C[C@@H]1O[C@@H](O[C@@H]2[C@@H](O)[C@@H](O)O[C@H…
|
| ZINC103664705 ZINC | 0.549 | 488.4 Da LogP -6.55 TPSA 248.4 | 2 viol. | ✓ Clean |
C[C@@H]1O[C@@H](O[C@@H]2[C@@H](O)[C@H](O)O[C@H]…
|
| ZINC100352116 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@@H]1O[C@H](O)[C@H](O)[C@H](O)[C@@H]1O[C@@H…
|
| ZINC12358840 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@H]1O[C@@H](O[C@@H]2[C@@H](CO)O[C@H](O)[C@H…
|
| ZINC13542690 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@H]1O[C@H](O[C@@H]2[C@@H](CO)O[C@H](O)[C@@H…
|
| ZINC13543637 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@H]1O[C@H](O)[C@H](O)[C@@H](O)[C@@H]1O[C@H]…
|
| ZINC13544017 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@H]1O[C@H](O[C@H]2[C@@H](CO)O[C@H](O)[C@H](…
|
| ZINC13544387 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@H]1O[C@H](O[C@@H]2[C@@H](CO)O[C@@H](O)[C@@…
|
| ZINC13549339 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@@H]1O[C@H](O)[C@@H](O)[C@H](O)[C@H]1O[C@@H…
|
| ZINC16051576 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@H]1O[C@@H](O[C@H]2[C@@H](CO)O[C@@H](O)[C@H…
|
| ZINC169619623 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@@H]1O[C@H](O)[C@@H](O)[C@H](O)[C@@H]1O[C@H…
|
| ZINC1857777749 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@@H]1O[C@@H](O)[C@H](O)[C@H](O)[C@@H]1O[C@H…
|
| ZINC1857777750 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@@H]1O[C@@H](O)[C@@H](O)[C@H](O)[C@@H]1O[C@…
|
| ZINC202563257 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@@H]1O[C@H](O)[C@H](O)[C@H](O)[C@@H]1O[C@@H…
|
| ZINC21984931 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@H]1O[C@H](O)[C@@H](O)[C@@H](O)[C@@H]1O[C@@…
|
| ZINC2382416917 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@@H]1O[C@H](O[C@@H]2[C@H](CO)O[C@@H](O)[C@@…
|
| ZINC2382416919 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@@H]1O[C@H](O[C@@H]2[C@H](CO)O[C@@H](O)[C@@…
|
| ZINC2383776696 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@@H]1O[C@@H](O[C@H]2[C@H](CO)O[C@@H](O)[C@H…
|
| ZINC2383776697 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@@H]1O[C@@H](O[C@H]2[C@H](CO)O[C@@H](O)[C@H…
|
| ZINC238735529 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@@H]1O[C@@H](O)[C@@H](O)[C@H](O)[C@@H]1O[C@…
|
| ZINC238809271 ZINC | 0.532 | 990.9 Da LogP -14.10 TPSA 506.1 | 3 viol. | ✓ Clean |
OC[C@H]1O[C@H](O[C@@H]2[C@@H](CO)O[C@H](O[C@@H]…
|
| ZINC242495944 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@@H]1O[C@H](O)[C@H](O)[C@H](O)[C@@H]1O[C@H]…
|
| ZINC257362198 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@@H]1O[C@H](O)[C@H](O)[C@H](O)[C@@H]1O[C@H]…
|
| ZINC257362199 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@@H]1O[C@H](O)[C@H](O)[C@H](O)[C@@H]1O[C@H]…
|
| ZINC26892042 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@H]1O[C@@H](O)[C@@H](O)[C@@H](O)[C@@H]1O[C@…
|
| ZINC35262676 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@@H]1O[C@@H](O)[C@H](O)[C@H](O)[C@@H]1O[C@@…
|
| ZINC35262677 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@@H]1O[C@@H](O)[C@H](O)[C@H](O)[C@@H]1O[C@@…
|
| ZINC3830982 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@@H]1O[C@H](O)[C@H](O)[C@H](O)[C@@H]1O[C@@H…
|
| ZINC3830983 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@@H]1O[C@H](O)[C@H](O)[C@H](O)[C@@H]1O[C@@H…
|
| ZINC3830985 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@@H]1O[C@@H](O[C@@H]2[C@H](CO)O[C@H](O)[C@H…
|
| ZINC38599727 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@@H]1O[C@H](O[C@@H]2[C@H](CO)O[C@H](O)[C@H]…
|
| ZINC38599730 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@@H]1O[C@H](O)[C@H](O)[C@H](O)[C@@H]1O[C@H]…
|
| ZINC38599734 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@@H]1O[C@H](O)[C@H](O)[C@H](O)[C@@H]1O[C@H]…
|
| ZINC38792149 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@H]1O[C@@H](O[C@H]2[C@@H](CO)O[C@H](O)[C@H]…
|
| ZINC4095490 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@H]1O[C@H](O[C@@H]2[C@@H](CO)O[C@H](O)[C@H]…
|
| ZINC4095762 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@H]1O[C@H](O[C@@H]2[C@@H](CO)O[C@@H](O)[C@H…
|
| ZINC4261771 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@@H]1O[C@@H](O)[C@H](O)[C@H](O)[C@@H]1O[C@@…
|
| ZINC4261772 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@@H]1O[C@@H](O)[C@H](O)[C@H](O)[C@@H]1O[C@@…
|
| ZINC44185569 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@@H]1O[C@H](O)[C@H](O)[C@H](O)[C@@H]1O[C@@H…
|
| ZINC5222455 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@@H]1O[C@H](O)[C@@H](O)[C@H](O)[C@H]1O[C@H]…
|
| ZINC5222464 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@@H]1O[C@@H](O)[C@@H](O)[C@H](O)[C@H]1O[C@H…
|
| ZINC599389315 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@@H]1O[C@@H](O)[C@H](O)[C@H](O)[C@H]1O[C@H]…
|
| ZINC72283166 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@@H]1O[C@H](O)[C@H](O)[C@H](O)[C@@H]1O[C@H]…
|
| ZINC72283167 ZINC | 0.532 | 342.3 Da LogP -5.40 TPSA 189.5 | 2 viol. | ✓ Clean |
OC[C@@H]1O[C@H](O)[C@H](O)[C@H](O)[C@@H]1O[C@H]…
|
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.