KpATCC43816 Protein target profile

penicillin-binding protein 1B

Accession: VK055_2402

Gene: AIK80999.1 mrcB 3D evidence: AlphaFold DB model + ColabFold model Metabolism Not in network UniProt A0A0H3GIH5
Length 851
Pocket druggability (P2Rank · AlphaFold DB model) 0.723
Direct ligand evidence 0 62 total records
Functional annotation 0 EC 12 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
2.3% of screened genomes Lower prevalence suggests narrower overlap with the screened gut microbiome.

Essentiality

Essential (DEG)
Y
DEG identity (%)
47.908 Higher values support similarity to known essential genes.
DEG E-value
0.0 Smaller values mean stronger essential-gene similarity.

Structure confidence

ColabFold pLDDT
86.47 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) 0.723
Structure A0A0H3GIH5
Pocket Pocket 1
Druggability (FPocket) 0.761
Structure A0A0H3GIH5
Pocket Pocket 15
ColabFold model
P2Rank 0.76 · Pocket 1
FPocket 0.269 · Pocket 18
Core conservation Accessory gene
Roary core
CoreCruncher accessory
Gut microbiome 109 / 4744 genomes with a hit
Prevalence 2.3%

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.

MAGDDREPIGRKGRPSRPTKQKVTRRRVREEDYDDEYDDDDYEDEKPVPRKAKGKGGKPRRKRSWLWLLVKLGIVFAVLIAAYGVYLDQKIRSRIDGKVWELPAAVYGRMVNLEPDMQISKNEMVRLLNATQYRQVSAMTRPGEYTVQANSIEMIRRPFDFPDSKEGQVRARLTFDGDHLETIENMDNNRQFGFFRLDPRLITMLQSPNGEQRLFVKRSGFPDLLVDTLLATEDRHFYEHDGISLYSIGRAVLANLTAGRTVQGASTLTQQLVKNLFLSSERSYWRKANEAYMALIVDARYSKDRILELYMNEVYLGQSGDNEIRGFPLASLYYFGRPVEELSLDQQALLVGMVKGASVYNPWRNPKLALERRNLVLRLLQQQQVIDQELYDMLSARPLGVQPRGGVISPQPAFMQMVRQELQAKLGDKVKDLSGVKIFTTFDSVAQDAAEKAASEGIPVLKKQRKLADLETAMVVVDRFTGEVRAMVGGAEPQFAGYNRAMQARRSIGSLAKPATYLTALSQPNQYRLNTWIADAPVTIRLSNGQTWSPQNDDRRFSGQVMLVDALTRSMNVPTVNLGMALGLPAVVDTWTKLGAPKNQLNAVPSMLLGALNLTPIEVAQAFQTIASGGNRAPLSALRSVIAEDGTVLYQSYPQAERAVPAQAAYMTLWTMQQVVQRGTGRQLGAKYPGLHLAGKTGTTNNNVDTWFAGIDGSQVTITWVGRDNNQPTKLYGASGAMSIYQRYLANQTPTPLVLTVPEDVVDMGVDSNGNFVCSGGMRSLPVWTTQPDALCRQGEMMQQQQLQQQEAKNPFNQSGQQPPPQQQQQQQQPPKQQEKSDGVAGWIKDMFGSN

Functional annotations

Enzyme classification and Gene Ontology terms linked to this protein.

12 GO

Subcellular localization

Localization
CytoplasmicMembrane

Gene Ontology (GO)

12
  • GO:0008658 Binding to penicillin, an antibiotic that contains the condensed beta-lactamthiazolidine ring system.
  • GO:0008233 Catalysis of the hydrolysis of a peptide bond. A peptide bond is a covalent bond formed when the carbon atom from the carboxyl group of one amino acid shares electrons with the nitrogen atom from the amino group of a second amino acid.
  • GO:0009274 A protective structure outside the cytoplasmic membrane composed of peptidoglycan (also known as murein), a molecule made up of a glycan (sugar) backbone of repetitively alternating N-acetylglucosamine and N-acetylmuramic acid with short, attached, cross-linked peptide chains containing unusual amino acids. An example of this component is found in Escherichia coli.
  • GO:0008955 Catalysis of the reaction: [GlcNAc-(1->4)-Mur2Ac(oyl-L-Ala-gamma-D-Glu-L-Lys-D-Ala-D-Ala)](n)-di-trans,octa-cis-undecaprenyl diphosphate + beta-D-GlcNAc-(1->4)-Mur2Ac(oyl-L-Ala-gamma-D-Glu-L-Lys-D-Ala-D-Ala)-di-trans,octa-cis-undecaprenyl diphosphate = [GlcNAc-(1->4)-Mur2Ac(oyl-L-Ala-gamma-D-Glu-L-Lys-D-Ala-D-Ala)](n+1)-di-trans-octa-cis-undecaprenyl diphosphate + di-trans,octa-cis-undecaprenyl diphosphate + H+.
  • GO:0009252 The chemical reactions and pathways resulting in the formation of peptidoglycans, any of a class of glycoconjugates found in bacterial cell walls and consisting of long glycan strands of alternating residues of beta-(1,4) linked N-acetylglucosamine and N-acetylmuramic acid, cross-linked by short peptides.
  • GO:0046677 Any process that results in a change in state or activity of a cell or an organism (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of an antibiotic stimulus. An antibiotic is a chemical substance produced by a microorganism which has the capacity to inhibit the growth of or to kill other microorganisms.
  • 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.
  • GO:0005886 The membrane surrounding a cell that separates the cell from its external environment. It consists of a phospholipid bilayer and associated proteins.
  • GO:0009002 Catalysis of the reaction: (Ac)2-L-Lys-D-alanyl-D-alanine + H2O = (Ac)2-L-Lys-D-alanine + D-alanine.
  • GO:0071555 A process that results in the assembly, arrangement of constituent parts, or disassembly of the cell wall, the rigid or semi-rigid envelope lying outside the cell membrane of plant, fungal and most prokaryotic cells, maintaining their shape and protecting them from osmotic lysis.
  • GO:0006508 The hydrolysis of proteins into smaller polypeptides and/or amino acids by cleavage of their peptide bonds.
  • GO:0008360 Any process that modulates the surface configuration of a cell.

Sequence domains and features

Domain and signature matches imported from InterPro and related databases.

32 records
Show feature table
Start End DB Term Name
196 403 SUPERFAMILY SSF53955 Lysozyme-like
196 403 InterPro IPR023346 Lysozyme-like domain superfamily
113 197 Pfam PF14814 Bifunctional transglycosylase second domain
113 197 InterPro IPR028166 Bifunctional transglycosylase second domain
87 851 Phobius NON_CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the extracellular region.
111 200 Gene3D G3DSA:3.30.2060.10 -
1 64 Phobius CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the cytoplasm.
398 767 FunFam G3DSA:3.40.710.10:FF:000006 Penicillin-binding protein 1B
209 380 Pfam PF00912 Transglycosylase
209 380 InterPro IPR001264 Glycosyl transferase, family 51
795 835 MobiDBLite mobidb-lite consensus disorder prediction
58 96 Gene3D G3DSA:1.20.5.100 -
201 404 FunFam G3DSA:1.10.3810.10:FF:000002 Penicillin-binding protein 1B
103 767 Gene3D G3DSA:3.40.710.10 -
103 767 InterPro IPR012338 Beta-lactamase/transpeptidase-like
65 87 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
473 713 Pfam PF00905 Penicillin binding protein transpeptidase domain
473 713 InterPro IPR001460 Penicillin-binding protein, transpeptidase
201 404 Gene3D G3DSA:1.10.3810.10 -
201 404 InterPro IPR036950 Penicillin binding protein transglycosylase domain
68 792 NCBIfam TIGR02071 penicillin-binding protein 1B
68 792 InterPro IPR011813 Penicillin-binding protein 1B
46 836 PANTHER PTHR32282 BINDING PROTEIN TRANSPEPTIDASE, PUTATIVE-RELATED
1 79 Pfam PF14812 Transmembrane domain of transglycosylase PBP1 at N-terminal
1 79 InterPro IPR032730 Transglycosylase PBP1b, N-terminal transmembrane domain
36 849 PIRSF PIRSF002799 PBP1b
36 849 InterPro IPR011813 Penicillin-binding protein 1B
65 86 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
795 851 MobiDBLite mobidb-lite consensus disorder prediction
362 788 SUPERFAMILY SSF56601 beta-lactamase/transpeptidase-like
362 788 InterPro IPR012338 Beta-lactamase/transpeptidase-like
1 56 MobiDBLite mobidb-lite consensus disorder prediction

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
0.723
Likely same site as FPocket 15 2.5 Å 19 shared residues 83% of smaller site
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Surrounding area
Pocket 2 P2Rank #2
0.46
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Surrounding area
Pocket 3 P2Rank #3
0.306
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Surrounding area
Pocket 4 P2Rank #4
0.107
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Surrounding area
Pocket 5 P2Rank #5
0.06
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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 #15
0.761 Unusual size
Likely same site as P2Rank 1 2.5 Å 19 shared residues 83% of smaller site
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Surrounding area
Pocket 2 FPocket #36
0.214
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Surrounding area
Residue sets
UniProt: Active site:233-233 Proton donor; for transglycosylase activity
UniProt: Active site:510-510 Acyl-ester intermediate; for transpeptidase activity
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_A0A0H3GIH5
AlphaFold DB full sequence Viewing
ColabFold VK055_2402
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.

62 records
Chemistry signal

Structural ligand evidence is available for this target.

Direct evidence 0 same-protein records
Transferred evidence 12 records from similar proteins
Structural ligands 12 0 loaded crystals
Measured bioactivity 0 direct and transferred ChEMBL records
Proposed compounds 50 similarity-based ZINC candidates
Best available ligand signal
5VW PDB via homolog 352.4 Da · LogP -2.29 · TPSA 146.3 Open detail RCSB PDB
63U PDB via homolog Detail RCSB PDB
63V PDB via homolog Detail RCSB PDB
AIX PDB via homolog Detail RCSB PDB
AZR 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
5VW RCSB PDB P02919 352.4 Da LogP -2.29 TPSA 146.3 ✓ Ro5 ✓ Clean C1C[C@H](N(C[C@@H]1NOS(=O)(=O)O)C=O)C(=O)NO[C@H…
63U RCSB PDB P02919 349.4 Da LogP 0.39 TPSA 121.5 ✓ Ro5 ✓ Clean CC1=C(N[C@@H](SC1)[C@@H](C=O)NC(=O)[C@@H](c2ccc…
63V RCSB PDB P02919 338.4 Da LogP 1.13 TPSA 95.8 ✓ Ro5 ✓ Clean C=C1CS[C@H](N=C1C(=O)O)[C@@H](C=O)NC(=O)Cc2cccs2
AIX RCSB PDB P02919 351.4 Da LogP 0.26 TPSA 121.5 ✓ Ro5 ✓ Clean CC1([C@@H](N[C@H](S1)[C@@H](C=O)NC(=O)[C@@H](c2…
AZR RCSB PDB P02919 437.5 Da LogP -1.23 TPSA 210.4 ✓ Ro5 ✓ Clean C[C@@H]([C@@H](C=O)NC(=O)/C(=N\OC(C)(C)C(=O)O)/…
BMG RCSB PDB Q04707 352.4 Da LogP -1.95 TPSA 111.2 ✓ Ro5 ✓ Clean C[C@@H]1[C@@H](NC(=C1S[C@@H]2Cn3cnc[n+]3C2)C(=O…
CB9 RCSB PDB Q8Y547 380.4 Da LogP 0.43 TPSA 132.8 ✓ Ro5 ✓ Clean CC1([C@@H](N[C@H](S1)[C@@H](C=O)NC(=O)[C@H](c2c…
DXF RCSB PDB Q8Y547 426.4 Da LogP -0.59 TPSA 182.6 ✓ Ro5 ✓ Clean CO/N=C(/c1ccco1)\C(=O)N[C@H](C=O)[C@@H]2NC(=C(C…
LDA RCSB PDB Q8KHY3 229.4 Da LogP 4.48 TPSA 23.1 ✓ Ro5 ✓ Clean CCCCCCCCCCCC[N+](C)(C)[O-]
M0E RCSB PDB P02919 1580.6 Da LogP -2.25 TPSA 607.7 3 viol. ✓ Clean C[C@@H]1[C@H]([C@@H]([C@H]([C@@H](O1)O[C@@H]2[C…
TEB RCSB PDB Q04707 385.5 Da LogP 0.61 TPSA 102.2 ✓ Ro5 ✓ Clean C[C@@H]1[C@@H](NC(=C1SC2CN(C2)C3=NCCS3)C(=O)O)[…
TLA RCSB PDB Q8Y547 150.1 Da LogP -2.12 TPSA 115.1 ✓ Ro5 ✓ Clean [C@@H]([C@H](C(=O)O)O)(C(=O)O)O

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.