KpKP13 Protein target profile

Colicin I receptor

Accession: KP13_05056

Gene: AHE43571.1 cirA 3D evidence: AlphaFold DB model + ColabFold model UniProt W8UHH6
Length 657
Pocket druggability (P2Rank · AlphaFold DB model) 0.953
Direct ligand evidence 0 64 total records
Functional annotation 0 EC 3 GO
Target summary

Strong target candidate with converging metabolic, structural and chemical evidence.

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
0.8% 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.

Structure confidence

ColabFold pLDDT
91.11 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) 0.953
Structure W8UHH6
Pocket Pocket 1
Druggability (FPocket) 0.943
Structure W8UHH6
Pocket Pocket 39
ColabFold model
P2Rank 0.952 · Pocket 1
FPocket 0.845 · Pocket 4
Core conservation Conserved core gene
Roary core
CoreCruncher core
Gut microbiome 38 / 4744 genomes with a hit
Prevalence 0.8%

Sequence

Primary amino-acid sequence viewer.

MFRLNPFIRAGLSASVVSLAFPALADVNEETLVVTASATEQNVKDAPASISVITQQDLQRKPVQNLKDVLRDVPGVQLTNEGDNRKGVSIRGLSSSYTLILVDGKRVNSRNAVFRHNDFDLNWIPVDAIERIEVVRGPMSSLYGSDALGGVVNIITKKIGQKWTGTLSADTTIQEHRDRGDTYNGQFFTSGPLIDGVLGMKAYGSLAKRAKDDPQSSSNATGETPRIEGFTSRDGNVEFAWTPNENHDFTAGYGFDRQDRDSDSLDRNRLERENYSLSHNGRWDIGNSELKFYGEKVDNKNPGQSGTITSESNAIDGKYVLPLGMINQLVTFGGEWRHDKLKDPVNLSSGGQSTSASQYALFIEDEWRIIEPLALTTGIRMDDHQTYGDHWSPRAYLVYNATDTVTVKGGWATAFKAPSLLQLNPDWTTNSCRGSCSIVGNPDLKPETSESFELGLYYRGEEGWLENVEGSITTFQNNVDDMIDVLRTSSASEAPGYPNFVGWKTVNGKRVPIFRYFNVNKARIKGVETEVKIPFGDEWKLTVNYTYNDGRDLSNGGDKPLQTLPFHTANGTLDWKPLDDWSFYVTANYTGQQRAVSATGKTPGGYTLFDVGAAWQVTKNVKLRSGVQNVGDKDLSRDDYSYTEEGRRYFMAVDYRF

Functional annotations

Enzyme classification and Gene Ontology terms linked to this protein.

3 GO

Subcellular localization

Localization
OuterMembrane

Gene Ontology (GO)

3
  • GO:0009279 A lipid bilayer that forms the outermost membrane of the cell envelope; enriched in polysaccharide and protein; the outer leaflet of the membrane contains specific lipopolysaccharide structures.
  • GO:0015344 Enables the transfer of a solute or solutes from one side of a membrane to the other according to the reaction: siderophore-iron(ferrioxamine)(out) + H+(out) = siderophore-iron(ferrioxamine)(in) + H+(in).
  • GO:0044718 The directed movement of siderophores, low molecular weight Fe(III)-chelating substances, from one side of a membrane to the other, by means of some agent such as a transporter or pore.

Sequence domains and features

Domain and signature matches imported from InterPro and related databases.

26 records
Show feature table
Start End DB Term Name
25 156 Gene3D G3DSA:2.170.130.10 -
25 156 InterPro IPR037066 TonB-dependent receptor, plug domain superfamily
211 226 MobiDBLite mobidb-lite consensus disorder prediction
1 25 Phobius SIGNAL_PEPTIDE Signal peptide region
30 657 SUPERFAMILY SSF56935 Porins
1 25 SignalP_GRAM_NEGATIVE SignalP-noTM SignalP-noTM
640 657 ProSitePatterns PS01156 TonB-dependent receptor proteins signature 2.
640 657 InterPro IPR010917 TonB-dependent receptor, conserved site
43 151 Pfam PF07715 TonB-dependent Receptor Plug Domain
43 151 InterPro IPR012910 TonB-dependent receptor, plug domain
10 21 Phobius SIGNAL_PEPTIDE_H_REGION Hydrophobic region of a signal peptide.
209 237 MobiDBLite mobidb-lite consensus disorder prediction
49 657 CDD cd01347 ligand_gated_channel
162 657 Gene3D G3DSA:2.40.170.20 -
162 657 InterPro IPR036942 TonB-dependent receptor-like, beta-barrel domain superfamily
1 37 ProSitePatterns PS00430 TonB-dependent receptor proteins signature 1.
1 37 InterPro IPR010916 TonB box, conserved site
1 25 SignalP_GRAM_POSITIVE SignalP-TM SignalP-TM
218 656 Pfam PF00593 TonB dependent receptor
218 656 InterPro IPR000531 TonB-dependent receptor-like, beta-barrel
18 657 PANTHER PTHR30069 TONB-DEPENDENT OUTER MEMBRANE RECEPTOR
18 657 InterPro IPR039426 TonB-dependent receptor-like
22 25 Phobius SIGNAL_PEPTIDE_C_REGION C-terminal region of a signal peptide.
24 156 FunFam G3DSA:2.170.130.10:FF:000004 Colicin I TonB-dependent receptor
26 657 Phobius NON_CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the extracellular region.
1 9 Phobius SIGNAL_PEPTIDE_N_REGION N-terminal region of a signal peptide.

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
0.953
Likely same site as FPocket 14 5.0 Å 26 shared residues 93% of smaller site
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Surrounding area
Pocket 2 P2Rank #2
0.859
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Surrounding area
Pocket 3 P2Rank #3
0.749
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Surrounding area
Pocket 4 P2Rank #4
0.516
Likely same site as FPocket 39 5.6 Å 18 shared residues 82% of smaller site
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Surrounding area
Pocket 5 P2Rank #5
0.492
Likely same site as FPocket 39 4.5 Å 20 shared residues 95% of smaller site
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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 #39
0.943 Unusual size
Likely same site as P2Rank 5 4.5 Å 20 shared residues 95% of smaller site
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Surrounding area
Pocket 2 FPocket #14
0.864 Unusual size
Likely same site as P2Rank 1 5.0 Å 26 shared residues 93% of smaller site
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Surrounding area
Pocket 3 FPocket #48
0.344
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Surrounding area
Pocket 4 FPocket #8
0.245
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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_W8UHH6
AlphaFold DB full sequence Viewing
ColabFold KP13_05056
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.

64 records
Chemistry signal

Structural ligand evidence is available for this target.

Direct evidence 0 same-protein records
Transferred evidence 14 records from similar proteins
Structural ligands 14 0 loaded crystals
Measured bioactivity 0 direct and transferred ChEMBL records
Proposed compounds 50 similarity-based ZINC candidates
Best available ligand signal
8SW PDB via homolog 692.6 Da · LogP -1.77 · TPSA 296.0 Open detail RCSB PDB
8T2 PDB via homolog Detail RCSB PDB
95B PDB via homolog Detail RCSB PDB
C8E PDB via homolog Detail RCSB PDB
EB4 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
8SW RCSB PDB Q05098 692.6 Da LogP -1.77 TPSA 296.0 3 viol. Alert C#CCNC(=O)C(CNC(=O)C(CNC(=O)CNC(=O)c1cccc(c1O)O…
8T2 RCSB PDB Q05098 624.6 Da LogP 1.95 TPSA 237.8 2 viol. Alert c1cc(c(c(c1)O)O)C(=O)NCCCC[C@@H](C(=O)NCCCCNC(=…
95B RCSB PDB Q05098 418.4 Da LogP 1.29 TPSA 176.4 1 viol. Alert c1cc(c(c(c1)O)O)C(=O)NCCCC[C@@H](C(=O)O)NC(=O)c…
C8E RCSB PDB P06129 306.4 Da LogP 2.41 TPSA 57.2 ✓ Ro5 ✓ Clean CCCCCCCCOCCOCCOCCOCCO
EB4 RCSB PDB Q05098 669.6 Da LogP -0.74 TPSA 287.6 3 viol. Alert c1cc(c(c(c1)O)O)C(=O)N[C@H]2COC(=O)[C@H](COC(=O…
EFE RCSB PDB C5I2D9 378.3 Da LogP 1.23 TPSA 38.5 ✓ Ro5 ✓ Clean C[N@+]12[C@@H]3CS[C@H]1[C@@H]4CSC5=[N+]4[Fe@]2(…
HEX RCSB PDB P06129 86.2 Da LogP 2.59 TPSA 0.0 ✓ Ro5 ✓ Clean CCCCCC
LDA RCSB PDB P17315 229.4 Da LogP 4.48 TPSA 23.1 ✓ Ro5 ✓ Clean CCCCCCCCCCCC[N+](C)(C)[O-]
LP5 RCSB PDB Q05098 711.9 Da LogP 4.91 TPSA 212.3 2 viol. ✓ Clean CCCCCCCCCCC[C@H](CC(=O)N[C@@H]1[C@H]([C@@H]([C@…
MPG RCSB PDB P06129 356.5 Da LogP 4.92 TPSA 66.8 ✓ Ro5 ✓ Clean CCCCCCCC/C=C\CCCCCCCCOC(=O)[C@@H](CO)O
MTN RCSB PDB P06129 264.4 Da LogP 1.82 TPSA 57.3 ✓ Ro5 ✓ Clean CC1(C=C(C(N1[O])(C)C)CSS(=O)(=O)C)C
OCT RCSB PDB P06129 114.2 Da LogP 3.37 TPSA 0.0 ✓ Ro5 ✓ Clean CCCCCCCC
OES RCSB PDB P17315 206.4 Da LogP 2.09 TPSA 37.3 ✓ Ro5 ✓ Clean CCCCCCCC[S@@](=O)CCO
OWT RCSB PDB Q05098 963.0 Da LogP 1.10 TPSA 299.6 3 viol. Alert CC(=O)NCC1CN(C(=O)O1)c2ccc(c(c2)F)N3CCN(CC3)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.