KpATCC43816 Protein target profile

heavy metal sensor kinase family protein

Accession: VK055_2703

Gene: AIK81293.1 3D evidence: AlphaFold DB model + ColabFold model Metabolism Not in network UniProt A0A0H3GHQ0
Length 477
Pocket druggability (P2Rank · AlphaFold DB model) 0.865
Direct ligand evidence 0 52 total records
Functional annotation 1 EC 9 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
1.0% of screened genomes Lower prevalence suggests narrower overlap with the screened gut microbiome.

Essentiality

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

Structure confidence

ColabFold pLDDT
85.33 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) 0.865
Structure A0A0H3GHQ0
Pocket Pocket 1
Druggability (FPocket) 0.869
Structure A0A0H3GHQ0
Pocket Pocket 31
ColabFold model
P2Rank 0.71 · Pocket 1
FPocket 0.865 · Pocket 4
Core conservation Conserved core gene
Roary core
CoreCruncher core
Gut microbiome 49 / 4744 genomes with a hit
Prevalence 1.0%

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.

MAAKRPFSLATRLTFFISLATIIAFFAFTWIMIHSVKAHFEERDVHDLRQLSTTLETVLDHADYPPARRLEIVRNIIAGYANVFICLDDDQGNILFQSPNGPDLSHILSTPGLAMQLRDGNVISWTDPQPRAMAHDNHPLETRAWRLIMLPLGKQADGKPAYHLLMALSIDFHLHYINELKAKLISAATIISLLIIAIVLFVVYQGHKPIRQISRQIQNITSRDLDVRLDPQAVPIELERLALSFNHMLERIEDVFTRQSNFSADIAHEIRTPITNLVTQTEIALSQSRSQQELEEVLYSNLEEFSRMSRMVSDMLFLAQADNNQLIPEQQALDLADEVHKVFEFFEAWAEEKAVALRFVGSHCRVIGDPLMLRRAISNLLSNAIRYTPAGQAVTIQLSESAETVRLVVENPGTPIAAEHLPRLFDRFYRVDPSRQRKGEGSGIGLAIVKSIVGAHHGSVAAQSDLRSTRFIVVLPK

Functional annotations

Enzyme classification and Gene Ontology terms linked to this protein.

1 EC 9 GO

Subcellular localization

Localization
CytoplasmicMembrane

Enzyme Commission (EC)

1

Gene Ontology (GO)

9
  • GO:0016772 Catalysis of the transfer of a phosphorus-containing group from one compound (donor) to another (acceptor).
  • GO:0016020 A lipid bilayer along with all the proteins and protein complexes embedded in it and attached to it.
  • GO:0000155 Catalysis of the phosphorylation of a histidine residue in response to detection of an extracellular signal such as a chemical ligand or change in environment, to initiate a change in cell state or activity. The two-component sensor is a histidine kinase that autophosphorylates a histidine residue in its active site. The phosphate is then transferred to an aspartate residue in a downstream response regulator, to trigger a response.
  • GO:0007165 The cellular process in which a signal is conveyed to trigger a change in the activity or state of a cell. Signal transduction begins with reception of a signal (e.g. a ligand binding to a receptor or receptor activation by a stimulus such as light), or for signal transduction in the absence of ligand, signal-withdrawal or the activity of a constitutively active receptor. Signal transduction ends with regulation of a downstream cellular process, e.g. regulation of transcription or regulation of a metabolic process. Signal transduction covers signaling from receptors located on the surface of the cell and signaling via molecules located within the cell. For signaling between cells, signal transduction is restricted to events at and within the receiving cell.
  • GO:0000160 A conserved series of molecular signals found in prokaryotes and eukaryotes; involves autophosphorylation of a histidine kinase and the transfer of the phosphate group to an aspartate that then acts as a phospho-donor to response regulator proteins.
  • GO:0004673 Catalysis of the reaction: ATP + protein L-histidine = ADP + protein phospho-L-histidine.
  • GO:0016310 The process of introducing a phosphate group into a molecule, usually with the formation of a phosphoric ester, a phosphoric anhydride or a phosphoric amide.
  • 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:0005524 Binding to ATP, adenosine 5'-triphosphate, a universally important coenzyme and enzyme regulator.

Sequence domains and features

Domain and signature matches imported from InterPro and related databases.

49 records
Show feature table
Start End DB Term Name
265 477 ProSiteProfiles PS50109 Histidine kinase domain profile.
265 477 InterPro IPR005467 Histidine kinase domain
4 477 PANTHER PTHR45436 SENSOR HISTIDINE KINASE YKOH
15 34 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
254 325 FunFam G3DSA:1.10.287.130:FF:000001 Two-component sensor histidine kinase
313 477 SUPERFAMILY SSF55874 ATPase domain of HSP90 chaperone/DNA topoisomerase II/histidine kinase
313 477 InterPro IPR036890 Histidine kinase/HSP90-like ATPase superfamily
174 258 Gene3D G3DSA:6.10.340.10 -
161 178 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
207 255 SUPERFAMILY SSF158472 HAMP domain-like
184 206 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
258 320 CDD cd00082 HisKA
258 320 InterPro IPR003661 Signal transduction histidine kinase, dimerisation/phosphoacceptor domain
259 323 Gene3D G3DSA:1.10.287.130 -
329 477 FunFam G3DSA:3.30.565.10:FF:000006 Sensor histidine kinase WalK
204 257 SMART SM00304 HAMP_11
204 257 InterPro IPR003660 HAMP domain
205 477 Phobius CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the cytoplasm.
1 12 Phobius NON_CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the extracellular region.
329 477 Gene3D G3DSA:3.30.565.10 -
329 477 InterPro IPR036890 Histidine kinase/HSP90-like ATPase superfamily
423 433 PRINTS PR00344 Bacterial sensor protein C-terminal signature
423 433 InterPro IPR004358 Signal transduction histidine kinase-related protein, C-terminal
405 419 PRINTS PR00344 Bacterial sensor protein C-terminal signature
405 419 InterPro IPR004358 Signal transduction histidine kinase-related protein, C-terminal
440 458 PRINTS PR00344 Bacterial sensor protein C-terminal signature
440 458 InterPro IPR004358 Signal transduction histidine kinase-related protein, C-terminal
463 476 PRINTS PR00344 Bacterial sensor protein C-terminal signature
463 476 InterPro IPR004358 Signal transduction histidine kinase-related protein, C-terminal
368 476 Pfam PF02518 Histidine kinase-, DNA gyrase B-, and HSP90-like ATPase
368 476 InterPro IPR003594 Histidine kinase/HSP90-like ATPase
204 254 Pfam PF00672 HAMP domain
204 254 InterPro IPR003660 HAMP domain
208 252 CDD cd06225 HAMP
6 476 NCBIfam TIGR01386 heavy metal sensor histidine kinase
6 476 InterPro IPR006290 Heavy metal sensor kinase
204 257 ProSiteProfiles PS50885 HAMP domain profile.
368 477 SMART SM00387 HKATPase_4
368 477 InterPro IPR003594 Histidine kinase/HSP90-like ATPase
259 323 Pfam PF00512 His Kinase A (phospho-acceptor) domain
259 323 InterPro IPR003661 Signal transduction histidine kinase, dimerisation/phosphoacceptor domain
258 324 SMART SM00388 HisKA_10
258 324 InterPro IPR003661 Signal transduction histidine kinase, dimerisation/phosphoacceptor domain
179 183 Phobius NON_CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the extracellular region.
241 325 SUPERFAMILY SSF47384 Homodimeric domain of signal transducing histidine kinase
241 325 InterPro IPR036097 Signal transduction histidine kinase, dimerisation/phosphoacceptor domain superfamily
34 160 Phobius CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the cytoplasm.
13 33 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
184 204 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.

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
0.865
Likely same site as FPocket 42 1.7 Å 24 shared residues 89% of smaller site
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Surrounding area
Pocket 2 P2Rank #2
0.067
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Surrounding area
Pocket 3 P2Rank #3
0.036
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Surrounding area
Pocket 4 P2Rank #4
0.026
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Surrounding area
Pocket 5 P2Rank #5
0.021
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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 #31
0.869
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Surrounding area
Pocket 2 FPocket #42
0.253 Unusual size
Likely same site as P2Rank 1 1.7 Å 24 shared residues 89% 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_A0A0H3GHQ0
AlphaFold DB full sequence Viewing
ColabFold VK055_2703
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.

52 records
Chemistry signal

Structural ligand evidence is available for this target.

Direct evidence 0 same-protein records
Transferred evidence 2 records from similar proteins
Structural ligands 2 0 loaded crystals
Measured bioactivity 0 direct and transferred ChEMBL records
Proposed compounds 50 similarity-based ZINC candidates
Best available ligand signal
ANP PDB via homolog 506.2 Da · LogP -2.06 · TPSA 281.9 Open detail RCSB PDB
PG0 PDB via homolog Detail RCSB PDB
ZINC1580161 ZINC proposed compound · Tanimoto 1.000 Detail ZINC
ZINC16052118 ZINC proposed compound · Tanimoto 1.000 Detail ZINC
ZINC16052257 ZINC proposed compound · Tanimoto 1.000 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
ANP RCSB PDB P0AE82 506.2 Da LogP -2.06 TPSA 281.9 3 viol. ✓ Clean c1nc(c2c(n1)n(cn2)[C@H]3[C@@H]([C@@H]([C@H](O3)…
PG0 RCSB PDB P71815 120.1 Da LogP -0.36 TPSA 38.7 ✓ Ro5 ✓ Clean COCCOCCO

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.