KpATCC43816 Protein target profile

lon protease (S16) C-terminal proteolytic domainprotein

Accession: VK055_2741

Gene: AIK81331.1 3D evidence: AlphaFold DB model + ColabFold model Metabolism Not in network UniProt A0A5E1E4Q4
Length 694
Pocket druggability (P2Rank · AlphaFold DB model) 0.598
Direct ligand evidence 0 53 total records
Functional annotation 1 EC 5 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
2.5% of screened genomes Lower prevalence suggests narrower overlap with the screened gut microbiome.

Essentiality

Essential (DEG)
N
DEG identity (%)
28.369 Higher values support similarity to known essential genes.

Structure confidence

ColabFold pLDDT
88.99 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) 0.598
Structure A0A5E1E4Q4
Pocket Pocket 1
Druggability (FPocket) 0.62
Structure A0A5E1E4Q4
Pocket Pocket 2
ColabFold model
P2Rank 0.549 · Pocket 1
FPocket 0.932 · Pocket 40
Core conservation Accessory gene
Roary accessory
CoreCruncher accessory
Gut microbiome 117 / 4744 genomes with a hit
Prevalence 2.5%

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.

MQTHHDLPVPAVSEGELVAEGYDLDALLNQHFRGRVVRKDLTKQLKEGANVPVYVLEYLLGMYCASDDDQIVEQGLQNVKRILADNYVRPDEAEKVKSLIRERGSYKIIDKVSVKLNQKKDVYEAQLSNLGIKDALVPPQMVKDNEKLLTGGIWCMITVNYFFEEGQKTSPFSLMTLKPIQMPNMDMEEVFTARTHFNRDQWIDVLLRSVGMEPANIEQRTKWHLITRMIPFVENNYNVCELGPRGTGKSHVYKECSPNSLLVSGGQTTVANLFYNMASRQIGLVGMWDVVAFDEVAGITFKDKDGVQIMKDYMASGSFSRGRDSIEGKASMVFVGNINQSVETLVKTSHLLAPFPAAMIDTAFFDRFHAYIPGWEIPKMRPEFFTNRYGLITDYLAEYMREMRKRSFSDAIDKFYKLGNNLNQRDVIAVRRTVSGLLKLLHPNGSYSKEDVRVCLTYAMEARRRVKEQLKKLGGLEFFDVNFSYIDNETLEEFFVSVPEQGGSELIPAGMPKPGVVHLVTQAESGMTGLYRFETQMTAGNGKHSVSGLGSSTSAKEAIRVGFDYFKGNLSRVSATAKFSEHEYHLHVVELHNTGPSTATSLAALIALCSVLLAKPVQEQMVVLGSMTLGGVINPVQDLAASLQLAFDSGAKKVVLPMSSAVDIPTVPAELFTKFQVSFYSEPVDAVYKALGVN

Functional annotations

Enzyme classification and Gene Ontology terms linked to this protein.

1 EC 5 GO

Subcellular localization

Localization
Cytoplasmic

Enzyme Commission (EC)

1

Gene Ontology (GO)

5
  • GO:0005524 Binding to ATP, adenosine 5'-triphosphate, a universally important coenzyme and enzyme regulator.
  • GO:0006508 The hydrolysis of proteins into smaller polypeptides and/or amino acids by cleavage of their peptide bonds.
  • GO:0004176 Catalysis of the hydrolysis of peptide bonds, driven by ATP hydrolysis.
  • GO:0030163 The chemical reactions and pathways resulting in the breakdown of a protein by the destruction of the native, active configuration, with or without the hydrolysis of peptide bonds.
  • GO:0004252 Catalysis of the hydrolysis of internal, alpha-peptide bonds in a polypeptide chain by a catalytic mechanism that involves a catalytic triad consisting of a serine nucleophile that is activated by a proton relay involving an acidic residue (e.g. aspartate or glutamate) and a basic residue (usually histidine).

Sequence domains and features

Domain and signature matches imported from InterPro and related databases.

18 records
Show feature table
Start End DB Term Name
28 475 NCBIfam TIGR02688 BREX system Lon protease-like protein BrxL
28 475 InterPro IPR014061 Lon-like protease BrxL-like
22 694 NCBIfam TIGR02653 protease Lon-related BREX system protein BrxL
22 694 InterPro IPR013473 Lon-like protease BrxL
516 689 Pfam PF05362 Lon protease (S16) C-terminal proteolytic domain
516 689 InterPro IPR008269 Peptidase S16, Lon proteolytic domain
235 446 SUPERFAMILY SSF52540 P-loop containing nucleoside triphosphate hydrolases
235 446 InterPro IPR027417 P-loop containing nucleoside triphosphate hydrolase
513 693 SUPERFAMILY SSF54211 Ribosomal protein S5 domain 2-like
513 693 InterPro IPR020568 Ribosomal protein S5 domain 2-type fold
509 694 Gene3D G3DSA:3.30.230.10 -
509 694 InterPro IPR014721 Ribosomal protein S5 domain 2-type fold, subgroup
72 690 PANTHER PTHR10046 ATP DEPENDENT LON PROTEASE FAMILY MEMBER
72 690 InterPro IPR027065 Lon protease
30 161 Pfam PF20442 BREX system Lon protease-like protein BrxL N-terminal
30 161 InterPro IPR046838 BREX system Lon protease-like BrxL, N-terminal
172 484 Pfam PF13337 Lon-like protease BrxL-like, ATPase domain
172 484 InterPro IPR014061 Lon-like protease BrxL-like

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
0.598
Likely same site as FPocket 2 0.8 Å 11 shared residues 100% of smaller site
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Surrounding area
Pocket 2 P2Rank #2
0.21
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Surrounding area
Pocket 3 P2Rank #3
0.089
Likely same site as FPocket 40 1.8 Å 7 shared residues 88% of smaller site
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Surrounding area
Pocket 4 P2Rank #4
0.052
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Surrounding area
Pocket 5 P2Rank #5
0.048
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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 #2
0.62
Likely same site as P2Rank 1 0.8 Å 11 shared residues 100% of smaller site
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Surrounding area
Pocket 2 FPocket #40
0.515
Likely same site as P2Rank 3 1.8 Å 7 shared residues 88% of smaller site
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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_A0A5E1E4Q4
AlphaFold DB full sequence Viewing
ColabFold VK055_2741
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.

53 records
Chemistry signal

Structural ligand evidence is available for this target.

Direct evidence 0 same-protein records
Transferred evidence 3 records from similar proteins
Structural ligands 3 0 loaded crystals
Measured bioactivity 0 direct and transferred ChEMBL records
Proposed compounds 50 similarity-based ZINC candidates
Best available ligand signal
4KZ PDB via homolog 418.3 Da · LogP 0.56 · TPSA 124.4 Open detail RCSB PDB
AGS PDB via homolog Detail RCSB PDB
BO2 PDB via homolog Detail RCSB PDB
ZINC12360002 ZINC proposed compound · Tanimoto 0.855 Detail ZINC
ZINC12360703 ZINC proposed compound · Tanimoto 0.855 Detail ZINC

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
4KZ RCSB PDB A0A059VAZ3 418.3 Da LogP 0.56 TPSA 124.4 ✓ Ro5 ✓ Clean B([C@H](Cc1ccccc1)NC(=O)[C@H](Cc2ccccc2)NC(=O)c…
AGS RCSB PDB A0A059VAZ3 523.2 Da LogP -1.51 TPSA 262.1 3 viol. ✓ Clean c1nc(c2c(n1)n(cn2)[C@H]3[C@@H]([C@@H]([C@H](O3)…
BO2 RCSB PDB A0A059VAZ3 384.2 Da LogP 0.36 TPSA 124.4 ✓ Ro5 ✓ Clean B([C@H](CC(C)C)NC(=O)[C@H](Cc1ccccc1)NC(=O)c2cn…

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.