KpATCC43816 Protein target profile

his Kinase A domain protein

Accession: VK055_4882

Gene: AIK83409.1 3D evidence: AlphaFold DB model + ColabFold model Metabolism Not in network UniProt A0A0H3GSY4
Length 946
Pocket druggability (P2Rank · AlphaFold DB model) 0.91
Direct ligand evidence 0 52 total records
Functional annotation 1 EC 11 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
1.9% of screened genomes Lower prevalence suggests narrower overlap with the screened gut microbiome.

Essentiality

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

Structure confidence

ColabFold pLDDT
78.34 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) 0.91
Structure A0A0H3GSY4
Pocket Pocket 1
Druggability (FPocket) 0.489
Structure A0A0H3GSY4
Pocket Pocket 52
ColabFold model
P2Rank 0.922 · Pocket 1
FPocket 0.879 · Pocket 26
Core conservation Conserved core gene
Roary core
CoreCruncher core
Gut microbiome 92 / 4744 genomes with a hit
Prevalence 1.9%

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.

MKYFASFHTTLKVSRYLFRALAVLLWLLIAFVSVFYIVNALHEREAEIHQELNLNADQAQRYIQRTADVMKELKYVAGNRLSAGDAVAQGQNGDMAVPNFEPLYPDSDCSAMSATWRNSLQSLAWFMRYWRDNFTAAYDLNRIFLIGSDNLCMANFGLRDVPIERDQALKVLHQRIEQYRNAPQNERGNNLFWISQGVRPGVGYFYALTPVYMANRLQAMLGVEQTIRMESFFTPGSLPMSVTIFDDNGQPLISLAGAEGKIQSEAKWMQERMWFGYSSGFRELVLKKSLSPSSLSIVYSVSVDQVLERIRMLIINAIVLNILSGAMLFALARMYERRIFIPAENDAQRLEEHEQFNRKIVASAPVGICILRTADGTNILSNELAHNYLNMLTHEDRQRLTQIICGQQVNFVDVLTSNHTNLQISFVHSRYRNENVAICVLVDVSARVKMEESLQEMAQAAEQASQSKSMFLATVSHELRTPLYGIIGNLDLLQTKALPKGVDRLVTAMNNSSSLLLKIISDILDFSKIESEQLKIEPREFSPREVMNHISANYLPLVVRKQLGLYCFIEPDVPEQMSGDPMRLQQVISNLLSNAIKFTDTGCIVLHVQCAGDYLQISVRDTGEGIPAKEVLRLFDPFFQVGTGVQRNFQGTGLGLAICEKLISMMDGDIAVETEPGMGSRFTIRIPLYGVQNTSPVSRDGFAGKTCWLAIHNTSLAMFVTSLLSYHGLTVRRHAGETPDAEDVLLTDDEALNGWQGRAMVIFCRRHIGIPQERSAGEWLHSVTTPHELLPLLGRIFHVALASAENSPALMAPEAQAGNNDDMMILVVDDHPINRRLLADQLGSLGYQCVTANDGIDALNVLSKQHIDIVLSDVNMPNMDGYRLTQRIRQLGLTLPVIGVTANALAEEKQRCLESGMDSCLSKPVTLDVLKQTLTVYAARVRKGRE

Functional annotations

Enzyme classification and Gene Ontology terms linked to this protein.

1 EC 11 GO

Subcellular localization

Localization
CytoplasmicMembrane

Enzyme Commission (EC)

1

Gene Ontology (GO)

11
  • 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:0005524 Binding to ATP, adenosine 5'-triphosphate, a universally important coenzyme and enzyme regulator.
  • GO:0018106 The phosphorylation of peptidyl-histidine to form peptidyl-1'-phospho-L-histidine (otherwise known as tau-phosphohistidine, tele-phosphohistidine) or peptidyl-3'-phospho-L-histidine (otherwise known as pi-phosphohistidine, pros-phosphohistidine).
  • 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:0006355 Any process that modulates the frequency, rate or extent of cellular DNA-templated transcription.
  • GO:0004673 Catalysis of the reaction: ATP + protein L-histidine = ADP + protein phospho-L-histidine.
  • 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: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.

Sequence domains and features

Domain and signature matches imported from InterPro and related databases.

60 records
Show feature table
Start End DB Term Name
313 335 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
825 934 CDD cd17546 REC_hyHK_CKI1_RcsC-like
24 939 Hamap MF_00979 Sensor histidine kinase RcsC [rcsC].
24 939 InterPro IPR030856 Sensor histidine kinase RcsC
521 692 SUPERFAMILY SSF55874 ATPase domain of HSP90 chaperone/DNA topoisomerase II/histidine kinase
521 692 InterPro IPR036890 Histidine kinase/HSP90-like ATPase superfamily
817 946 FunFam G3DSA:3.40.50.2300:FF:000121 Sensor histidine kinase RcsC
584 688 CDD cd16922 HATPase_EvgS-ArcB-TorS-like
465 528 CDD cd00082 HisKA
465 528 InterPro IPR003661 Signal transduction histidine kinase, dimerisation/phosphoacceptor domain
822 942 SUPERFAMILY SSF52172 CheY-like
822 942 InterPro IPR011006 CheY-like superfamily
467 531 Pfam PF00512 His Kinase A (phospho-acceptor) domain
467 531 InterPro IPR003661 Signal transduction histidine kinase, dimerisation/phosphoacceptor domain
825 934 Pfam PF00072 Response regulator receiver domain
825 934 InterPro IPR001789 Signal transduction response regulator, receiver domain
336 946 Phobius NON_CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the extracellular region.
705 817 Gene3D G3DSA:3.40.50.10970 -
705 817 InterPro IPR038388 RcsC, C-terminal domain superfamily
703 803 ProSiteProfiles PS51426 ABL domain profile.
703 803 InterPro IPR019017 Signal transduction histidine kinase RcsC, alpha-beta loop, C-terminal
16 38 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
15 37 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
313 332 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
823 934 SMART SM00448 REC_2
823 934 InterPro IPR001789 Signal transduction response regulator, receiver domain
39 312 Phobius CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the cytoplasm.
824 938 ProSiteProfiles PS50110 Response regulatory domain profile.
824 938 InterPro IPR001789 Signal transduction response regulator, receiver domain
447 467 Coils Coil Coil
579 688 Pfam PF02518 Histidine kinase-, DNA gyrase B-, and HSP90-like ATPase
579 688 InterPro IPR003594 Histidine kinase/HSP90-like ATPase
579 690 SMART SM00387 HKATPase_4
579 690 InterPro IPR003594 Histidine kinase/HSP90-like ATPase
474 690 ProSiteProfiles PS50109 Histidine kinase domain profile.
474 690 InterPro IPR005467 Histidine kinase domain
444 530 FunFam G3DSA:1.10.287.130:FF:000019 Sensor histidine kinase RcsC
451 533 SUPERFAMILY SSF47384 Homodimeric domain of signal transducing histidine kinase
451 533 InterPro IPR036097 Signal transduction histidine kinase, dimerisation/phosphoacceptor domain superfamily
467 532 SMART SM00388 HisKA_10
467 532 InterPro IPR003661 Signal transduction histidine kinase, dimerisation/phosphoacceptor domain
633 643 PRINTS PR00344 Bacterial sensor protein C-terminal signature
633 643 InterPro IPR004358 Signal transduction histidine kinase-related protein, C-terminal
650 668 PRINTS PR00344 Bacterial sensor protein C-terminal signature
650 668 InterPro IPR004358 Signal transduction histidine kinase-related protein, C-terminal
674 687 PRINTS PR00344 Bacterial sensor protein C-terminal signature
674 687 InterPro IPR004358 Signal transduction histidine kinase-related protein, C-terminal
615 629 PRINTS PR00344 Bacterial sensor protein C-terminal signature
615 629 InterPro IPR004358 Signal transduction histidine kinase-related protein, C-terminal
1 15 Phobius NON_CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the extracellular region.
707 797 Pfam PF09456 RcsC Alpha-Beta-Loop (ABL)
707 797 InterPro IPR019017 Signal transduction histidine kinase RcsC, alpha-beta loop, C-terminal
824 946 Gene3D G3DSA:3.40.50.2300 -
699 813 SUPERFAMILY SSF52172 CheY-like
699 813 InterPro IPR011006 CheY-like superfamily
410 939 PANTHER PTHR45339 HYBRID SIGNAL TRANSDUCTION HISTIDINE KINASE J
532 691 Gene3D G3DSA:3.30.565.10 -
532 691 InterPro IPR036890 Histidine kinase/HSP90-like ATPase superfamily
443 530 Gene3D G3DSA:1.10.287.130 -
531 692 FunFam G3DSA:3.30.565.10:FF:000010 Sensor histidine kinase RcsC

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
0.91
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Surrounding area
Pocket 2 P2Rank #2
0.52
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Surrounding area
Pocket 3 P2Rank #3
0.506
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Surrounding area
Pocket 4 P2Rank #4
0.115
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Surrounding area
Pocket 5 P2Rank #5
0.111
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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 #52
0.489
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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_A0A0H3GSY4
AlphaFold DB full sequence Viewing
ColabFold VK055_4882
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
BEF PDB via homolog Detail RCSB PDB
ZINC12360002 ZINC proposed compound · Tanimoto 0.810 Detail ZINC
ZINC12360703 ZINC proposed compound · Tanimoto 0.810 Detail ZINC
ZINC12503599 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 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)…
BEF RCSB PDB O22267 66.0 Da LogP 0.88 TPSA 0.0 ✓ Ro5 ✓ Clean [Be-](F)(F)F

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.