KpKP13 Protein target profile

Vitamin B12 transporter btuB

Accession: KP13_00548

Gene: btuB AHE47024.1 3D evidence: AlphaFold DB model + ColabFold model UniProt A0A0H3GKA3
Length 612
Pocket druggability (P2Rank · AlphaFold DB model) 0.895
Direct ligand evidence 0 65 total records
Functional annotation 0 EC 8 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.

Structure confidence

ColabFold pLDDT
92.57 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) 0.895
Structure A0A0H3GKA3
Pocket Pocket 1
Druggability (FPocket) 0.495
Structure A0A0H3GKA3
Pocket Pocket 11
ColabFold model
P2Rank 0.945 · Pocket 1
FPocket 0.678 · Pocket 44
Core conservation Accessory gene
Roary accessory
CoreCruncher accessory
Gut microbiome 103 / 4744 genomes with a hit
Prevalence 2.2%

Sequence

Primary amino-acid sequence viewer.

MIKKASLMTALSVTAFSGWAQDSNSDTLVVTANRFQQPVNTVLAPTDIVTRDDIDRWQSKDLNDVMRRLPGVDIARNGGMGQSASLYVRGTEARHVLVLIDGVPMARPGISNGVDISQIPISLVQRVEYIRGPRSAVYGSGAIGGVVNIITMTDAERSQINAGAGTNGYQSYDGAFNKRFGDTLVTAAGSYQTTKGFNVQPNSSYSGDSDRDGYRNKMLWGGVQHQFDDNFSGFFRGYGYSANADYDQGNWGYAGGNDEDQSYTQSWDTGLHYHSGIYSSQLIANYQRIKDYNYSSDAGRYAAGTTLDDMEQRYIQWGNNVVVGHGAVSGGVDWKQEKLKSSGTTSTDVYKRDTTGLYLTGQQQIDSVTLEASGREDHDEQFGWHGTWQTAAGWEFIDGYRTTLSYGTGFLAPSLGQQYGAERFGIASNPNLKPEESKQWEAGLEGLTGPVDWRLSAYRYEIQNLIDYDNNAYYNVKSATIKGLEWTGNITTGPVEHHLTLQYVDPRDDETNKILYRRAKQQVKYELNGQVYDLGWDVTYHYIGKRYDYDYDNSRTVNMGGLSLWDVGLSYPVTSHLTVRGKIANLFDKDYETVYGYQSAGREYTLSGSYTF

Functional annotations

Enzyme classification and Gene Ontology terms linked to this protein.

8 GO

Subcellular localization

Localization
OuterMembrane

Gene Ontology (GO)

8
  • GO:0016020 A lipid bilayer along with all the proteins and protein complexes embedded in it and attached to it.
  • GO:0015420 Enables the transfer of a solute or solutes from one side of a membrane to the other according to the reaction: vitamin B12(out) + ATP + H2O = ADP + an vitamin B12(in) + H+ + phosphate. Vitamin B12 is alkylcob(III)alamin.
  • GO:0015889 The directed movement of cobalamin (vitamin B12), a water-soluble vitamin characterized by possession of a corrin nucleus containing a cobalt atom, into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore.
  • 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:0046930 A protein complex providing a discrete opening in a membrane that allows the passage of gases and/or liquids.
  • GO:0046872 Binding to a metal ion.
  • GO:0015288 Enables the transfer of substances, sized less than 1000 Da, from one side of a membrane to the other. The transmembrane portions of porins consist exclusively of beta-strands which form a beta-barrel. They are found in the outer membranes of Gram-negative bacteria, mitochondria, plastids and possibly acid-fast Gram-positive bacteria.
  • GO:0006811 The directed movement of a monoatomic ion into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore. Monatomic ions (also called simple ions) are ions consisting of exactly one atom.

Sequence domains and features

Domain and signature matches imported from InterPro and related databases.

27 records
Show feature table
Start End DB Term Name
172 611 Pfam PF00593 TonB dependent receptor
172 611 InterPro IPR000531 TonB-dependent receptor-like, beta-barrel
1 22 SignalP_GRAM_POSITIVE SignalP-TM SignalP-TM
41 146 Pfam PF07715 TonB-dependent Receptor Plug Domain
41 146 InterPro IPR012910 TonB-dependent receptor, plug domain
2 612 Hamap MF_01531 Vitamin B12 transporter BtuB [btuB].
2 612 InterPro IPR010101 TonB-dependent vitamin B12 transporter BtuB
5 16 Phobius SIGNAL_PEPTIDE_H_REGION Hydrophobic region of a signal peptide.
1 20 Phobius SIGNAL_PEPTIDE Signal peptide region
26 612 SUPERFAMILY SSF56935 Porins
155 612 Gene3D G3DSA:2.40.170.20 -
155 612 InterPro IPR036942 TonB-dependent receptor-like, beta-barrel domain superfamily
595 612 ProSitePatterns PS01156 TonB-dependent receptor proteins signature 2.
595 612 InterPro IPR010917 TonB-dependent receptor, conserved site
45 612 CDD cd01347 ligand_gated_channel
1 33 ProSitePatterns PS00430 TonB-dependent receptor proteins signature 1.
1 33 InterPro IPR010916 TonB box, conserved site
1 20 SignalP_EUK SignalP-noTM SignalP-noTM
13 612 PANTHER PTHR30069 TONB-DEPENDENT OUTER MEMBRANE RECEPTOR
13 612 InterPro IPR039426 TonB-dependent receptor-like
17 20 Phobius SIGNAL_PEPTIDE_C_REGION C-terminal region of a signal peptide.
19 154 Gene3D G3DSA:2.170.130.10 -
19 154 InterPro IPR037066 TonB-dependent receptor, plug domain superfamily
27 150 FunFam G3DSA:2.170.130.10:FF:000002 Vitamin B12 transporter BtuB
21 612 Phobius NON_CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the extracellular region.
2 612 NCBIfam TIGR01779 TonB-dependent vitamin B12 receptor
1 4 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.

Download VMD script Full viewer

Loading 3D structure...

Drag to rotate — click the view, then scroll to zoom.

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
0.895
Show in viewer
Surrounding area
Pocket 2 P2Rank #2
0.894
Show in viewer
Surrounding area
Pocket 3 P2Rank #3
0.719
Show in viewer
Surrounding area
Pocket 4 P2Rank #4
0.687
Show in viewer
Surrounding area
Pocket 5 P2Rank #5
0.528
Show in viewer
Surrounding area

Binding pockets · FPocket

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

Pocket 1 FPocket #11
0.495 Unusual size
Show in viewer
Surrounding area
Pocket 2 FPocket #40
0.452
Show in viewer
Surrounding area
Pocket 3 FPocket #1
0.306
Show in viewer
Surrounding area
Pocket 4 FPocket #9
0.285
Show in viewer
Surrounding area
Residue sets
UniProt: Binding site:110-111
UniProt: Binding site:198-198
UniProt: Binding site:210-210
UniProt: Binding site:212-212
UniProt: Binding site:246-246
UniProt: Binding site:247-247
UniProt: Binding site:249-249
UniProt: Binding site:258-258
UniProt: Binding site:306-306
UniProt: Binding site:517-517
UniProt: Binding site:85-85
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_A0A0H3GKA3
AlphaFold DB full sequence Viewing
ColabFold KP13_00548
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.

65 records
Chemistry signal

Structural ligand evidence is available for this target.

Direct evidence 0 same-protein records
Transferred evidence 15 records from similar proteins
Structural ligands 15 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 D0C8V9 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…
FLC RCSB PDB P13036 189.1 Da LogP -5.25 TPSA 140.6 ✓ Ro5 ✓ Clean C(C(=O)[O-])C(CC(=O)[O-])(C(=O)[O-])O
HEX RCSB PDB P06129 86.2 Da LogP 2.59 TPSA 0.0 ✓ Ro5 ✓ Clean CCCCCC
HTO RCSB PDB P13036 148.2 Da LogP -0.11 TPSA 60.7 ✓ Ro5 ✓ Clean CCCC[C@H]([C@@H](CO)O)O
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.