KpATCC43816 Protein target profile

hybrid sensory histidine kinase, in two-component regulatory system with UvrY

Accession: VK055_4386

Gene: barA AIK82929.1 3D evidence: AlphaFold DB model + ColabFold model Metabolism Not in network UniProt A0A0H3GUH1
Length 916
Pocket druggability (P2Rank · AlphaFold DB model) 0.876
Direct ligand evidence 0 53 total records
Functional annotation 1 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
2.1% of screened genomes Lower prevalence suggests narrower overlap with the screened gut microbiome.

Essentiality

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

Structure confidence

ColabFold pLDDT
81.3 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) 0.876
Structure A0A0H3GUH1
Pocket Pocket 1
Druggability (FPocket) 0.563
Structure A0A0H3GUH1
Pocket Pocket 53
ColabFold model
P2Rank 0.936 · Pocket 1
FPocket 0.945 · Pocket 23
Core conservation Conserved core gene
Roary core
CoreCruncher core
Gut microbiome 101 / 4744 genomes with a hit
Prevalence 2.1%

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.

MTNYSLRARMMILILAPTVLIGLLLSIFFVAHRYNDLQRQLEDAGASIIEPLAVSSEYGMNLQNRESIGQLISVLHRRHSEIVRAISVYDSHNRLFVTSNYQLNPSELQIPKGEAFPRHLSVIRDGDMMILRTPIVSESYSPDESPESDAKMPGNMLGYVALELDLKSVRLQQYKEIFISSVMMLFCIGIALIFGWRLMRDVTGPIRNMVNTVDRIRRGQLDSRVEGFMLGELDMLKNGINSMAMSLAAYHEEMQHNVDQATSDLRETLEQMEIQNVELDLAKKRAQEAARIKSEFLANMSHELRTPLNGVIGFTRLTLKTDLNATQRDHLTTIERSANNLLAIINDVLDFSKLEAGKLILESIPFLLRTSLDEVVTLLAHSAHDKGLELTLNIKNNVPDNVIGDPLRLQQIVTNLVGNAIKFTEHGNIDVLVEQRAISNSRVQIEIQIHDTGIGIPERDQSRLFQAFRQADASISRRHGGTGLGLVITQRLVKEMGGDISFHSQPNRGSTFWFHISLDLNPNAIPDTLNTDGLVGKRLAYVEANATAAQCTLEMLAATPLEVIYSPTFSSLAEAQYDILLVGIPVSMRDLSPHREKLAKACAMSDNVLLALPCHAQVSAEALKRDGVAACLLKPLTTTRLLPALVATSHALASAPLMQIDSHKLPMTVMAVDDNPANLKLIGALLDDLVQQVILCDSGQQAVDKAKQLQMDLILMDIQMPDMDGIRACELIHHLSHHQQTPVIAVTAHALEGQREKLLSAGMNDYLAKPIEEEKLHALLLRYQPGLHSVVPASLPPTEPIVDHNQTLDWQLALRQAAMKPDLAREMLQMLIAFMPEVRNKVEEQLVGEQPEGLVDLIHKLHGSCSYSGVPRLKKLCHTLESQLRAGTAAEDLEPELLELLDEMDNVAREACRMGV

Functional annotations

Enzyme classification and Gene Ontology terms linked to this protein.

1 EC 8 GO

Subcellular localization

Localization
CytoplasmicMembrane

Enzyme Commission (EC)

1

Gene Ontology (GO)

8
  • 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: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.

71 records
Show feature table
Start End DB Term Name
653 786 Gene3D G3DSA:3.40.50.2300 -
669 779 Pfam PF00072 Response regulator receiver domain
669 779 InterPro IPR001789 Signal transduction response regulator, receiver domain
409 518 CDD cd16922 HATPase_EvgS-ArcB-TorS-like
293 357 Pfam PF00512 His Kinase A (phospho-acceptor) domain
293 357 InterPro IPR003661 Signal transduction histidine kinase, dimerisation/phosphoacceptor domain
277 358 SUPERFAMILY SSF47384 Homodimeric domain of signal transducing histidine kinase
277 358 InterPro IPR036097 Signal transduction histidine kinase, dimerisation/phosphoacceptor domain superfamily
299 520 ProSiteProfiles PS50109 Histidine kinase domain profile.
299 520 InterPro IPR005467 Histidine kinase domain
200 249 SUPERFAMILY SSF158472 HAMP domain-like
177 199 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
257 355 FunFam G3DSA:1.10.287.130:FF:000003 Histidine kinase
200 916 Phobius NON_CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the extracellular region.
667 780 SMART SM00448 REC_2
667 780 InterPro IPR001789 Signal transduction response regulator, receiver domain
1 11 Phobius NON_CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the extracellular region.
32 177 Pfam PF09984 Single cache domain 4
32 177 InterPro IPR019247 Histidine kinase BarA, N-terminal
666 785 SUPERFAMILY SSF52172 CheY-like
666 785 InterPro IPR011006 CheY-like superfamily
292 357 SMART SM00388 HisKA_10
292 357 InterPro IPR003661 Signal transduction histidine kinase, dimerisation/phosphoacceptor domain
12 31 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
820 887 CDD cd00088 HPT
820 887 InterPro IPR008207 Signal transduction histidine kinase, phosphotransfer (Hpt) domain
10 32 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
356 522 FunFam G3DSA:3.30.565.10:FF:000020 Histidine kinase
826 906 Pfam PF01627 Hpt domain
826 906 InterPro IPR008207 Signal transduction histidine kinase, phosphotransfer (Hpt) domain
669 780 CDD cd17546 REC_hyHK_CKI1_RcsC-like
200 252 ProSiteProfiles PS50885 HAMP domain profile.
200 252 InterPro IPR003660 HAMP domain
168 256 Gene3D G3DSA:6.10.340.10 -
257 355 Gene3D G3DSA:1.10.287.130 -
804 914 Gene3D G3DSA:1.20.120.160 HPT domain
804 914 InterPro IPR036641 HPT domain superfamily
668 784 ProSiteProfiles PS50110 Response regulatory domain profile.
668 784 InterPro IPR001789 Signal transduction response regulator, receiver domain
817 912 SMART SM00073 hpt_2
817 912 InterPro IPR008207 Signal transduction histidine kinase, phosphotransfer (Hpt) domain
198 247 Pfam PF00672 HAMP domain
198 247 InterPro IPR003660 HAMP domain
251 289 Coils Coil Coil
820 915 ProSiteProfiles PS50894 Histidine-containing phosphotransfer (HPt) domain profile.
820 915 InterPro IPR008207 Signal transduction histidine kinase, phosphotransfer (Hpt) domain
177 199 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
404 520 SMART SM00387 HKATPase_4
404 520 InterPro IPR003594 Histidine kinase/HSP90-like ATPase
763 907 SUPERFAMILY SSF47226 Histidine-containing phosphotransfer domain, HPT domain
763 907 InterPro IPR036641 HPT domain superfamily
346 517 SUPERFAMILY SSF55874 ATPase domain of HSP90 chaperone/DNA topoisomerase II/histidine kinase
346 517 InterPro IPR036890 Histidine kinase/HSP90-like ATPase superfamily
463 473 PRINTS PR00344 Bacterial sensor protein C-terminal signature
463 473 InterPro IPR004358 Signal transduction histidine kinase-related protein, C-terminal
445 459 PRINTS PR00344 Bacterial sensor protein C-terminal signature
445 459 InterPro IPR004358 Signal transduction histidine kinase-related protein, C-terminal
480 498 PRINTS PR00344 Bacterial sensor protein C-terminal signature
480 498 InterPro IPR004358 Signal transduction histidine kinase-related protein, C-terminal
504 517 PRINTS PR00344 Bacterial sensor protein C-terminal signature
504 517 InterPro IPR004358 Signal transduction histidine kinase-related protein, C-terminal
32 176 Phobius CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the cytoplasm.
404 519 Pfam PF02518 Histidine kinase-, DNA gyrase B-, and HSP90-like ATPase
404 519 InterPro IPR003594 Histidine kinase/HSP90-like ATPase
203 247 CDD cd06225 HAMP
291 353 CDD cd00082 HisKA
291 353 InterPro IPR003661 Signal transduction histidine kinase, dimerisation/phosphoacceptor domain
237 783 PANTHER PTHR45339 HYBRID SIGNAL TRANSDUCTION HISTIDINE KINASE J
200 252 SMART SM00304 HAMP_11
356 522 Gene3D G3DSA:3.30.565.10 -
356 522 InterPro IPR036890 Histidine kinase/HSP90-like ATPase superfamily

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
0.876
Likely same site as FPocket 53 5.7 Å 18 shared residues 62% of smaller site
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Surrounding area
Pocket 2 P2Rank #2
0.747
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Surrounding area
Pocket 3 P2Rank #3
0.406
Likely same site as FPocket 3 0.5 Å 17 shared residues 100% of smaller site
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Surrounding area
Pocket 4 P2Rank #4
0.035
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Surrounding area
Pocket 5 P2Rank #5
0.024
Likely same site as FPocket 67 3.4 Å 7 shared residues 88% 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 #53
0.563 Unusual size
Likely same site as P2Rank 1 5.7 Å 18 shared residues 62% of smaller site
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Surrounding area
Pocket 2 FPocket #3
0.333
Likely same site as P2Rank 3 0.5 Å 17 shared residues 100% of smaller site
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Surrounding area
Pocket 3 FPocket #67
0.256
Likely same site as P2Rank 5 3.4 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_A0A0H3GUH1
AlphaFold DB full sequence Viewing
ColabFold VK055_4386
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
ANP PDB via homolog 506.2 Da · LogP -2.06 · TPSA 281.9 Open detail RCSB PDB
BEF PDB via homolog Detail RCSB PDB
BTB PDB via homolog Detail RCSB PDB
ZINC1615342 ZINC proposed compound · Tanimoto 1.000 Detail ZINC
ZINC12360002 ZINC proposed compound · Tanimoto 0.810 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 Q9ABT2 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)…
BEF RCSB PDB O22267 66.0 Da LogP 0.88 TPSA 0.0 ✓ Ro5 ✓ Clean [Be-](F)(F)F
BTB RCSB PDB P0AEC6 209.2 Da LogP -3.01 TPSA 104.4 ✓ Ro5 ✓ Clean C(CO)N(CCO)C(CO)(CO)CO

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.