KpKP13 Protein target profile

Cell volume regulation protein A

Accession: KP13_01548

Gene: AHE43923.1 cvrA 3D evidence: AlphaFold DB model + ColabFold model UniProt A0A0H3GV98
Length 577
Pocket druggability (P2Rank · AlphaFold DB model) 0.777
Direct ligand evidence 0 54 total records
Functional annotation 0 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
2.3% of screened genomes Lower prevalence suggests narrower overlap with the screened gut microbiome.

Essentiality

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

Structure confidence

ColabFold pLDDT
86.25 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) 0.777
Structure A0A0H3GV98
Pocket Pocket 1
Druggability (FPocket) 0.654
Structure A0A0H3GV98
Pocket Pocket 6
ColabFold model
P2Rank 0.629 · Pocket 1
FPocket 0.715 · Pocket 15
Core conservation Conserved core gene
Roary core
CoreCruncher core
Gut microbiome 110 / 4744 genomes with a hit
Prevalence 2.3%

Sequence

Primary amino-acid sequence viewer.

MDAAAVISLFILGSVLVTCSILLSSFSSRLGIPILVIFLAIGMLAGIDGIGGIPFDNYPFAYMVSNLALAVILLDGGMRTQASSFRVALWPALSLATVGVLITSALTGMMAAWLFKLDLIEGLLIGAIVGSTDAAAVFSLLGGKGLNERVGSTLEIESGSNDPMAVFLTITLIEMIQQHQTGLSWMFAVHIIQQFGLGIAIGLGGGYLLLQMINRIVLPAGLYPLLALSGGIMIFAVTTSLDGSGILAVYLCGFLLGNRPIRNRHGILQNFDGLAWLAQIAMFLVLGLLVTPSDLLPIAIPALLLSMWMIFIARPLSVFAGLLPFRGFNLRERVFISWVGLRGAVPIILAVFPMMAGLDNARLFFNVAFFVVLVSLLLQGTSLSWAAKKAKVVVPPISWPISRVGLDIHPENPWEQFVYQLGADKWCIGAALRDLHMPPETRIAALFRNNVLLHPTGSTRLREGDILCVIGREHDLPALGKMFSQSPPVALDQRFFGDFILDAEARFADVAQIYGLDGGEEFREHQQSLGEVVQQLLGAAPVVGDQVEFAGMVWTVAEKENDHVLKVGVRVAEDEAE

Functional annotations

Enzyme classification and Gene Ontology terms linked to this protein.

11 GO

Subcellular localization

Localization
CytoplasmicMembrane

Gene Ontology (GO)

11
  • GO:0006812 The directed movement of a monoatomic cation, into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore. Monatomic cations (also called simple cations) are positively charged ions consisting of exactly one atom.
  • GO:0015297 Enables the active transport of a solute across a membrane by a mechanism whereby two or more species are transported in opposite directions in a tightly coupled process not directly linked to a form of energy other than chemiosmotic energy. The reaction is: solute A(out) + solute B(in) = solute A(in) + solute B(out).
  • GO:1902600 The directed movement of a proton across a membrane.
  • GO:0008324 Enables the transfer of cation from one side of a membrane to the other.
  • GO:0016020 A lipid bilayer along with all the proteins and protein complexes embedded in it and attached to it.
  • GO:0015386 Enables the transfer of a solute or solutes from one side of a membrane to the other according to the reaction: K+(in) + H+(out) = K+(out) + H+(in).
  • GO:0050660 Binding to FAD, flavin-adenine dinucleotide, the coenzyme or the prosthetic group of various flavoprotein oxidoreductase enzymes, in either the oxidized form, FAD, or the reduced form, FADH2.
  • GO:0006813 The directed movement of potassium ions (K+) into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore.
  • GO:0006884 Any process involved in maintaining the steady state of a cell's volume. The cell's volume refers to the three-dimensional space occupied by a cell.
  • GO:0055085 The process in which a solute is transported across a lipid bilayer, from one side of a membrane to the other.
  • GO:0005886 The membrane surrounding a cell that separates the cell from its external environment. It consists of a phospholipid bilayer and associated proteins.

Sequence domains and features

Domain and signature matches imported from InterPro and related databases.

62 records
Show feature table
Start End DB Term Name
77 87 Phobius CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the cytoplasm.
1 576 Hamap MF_01075 K(+)/H(+) antiporter NhaP2 [nhaP2].
1 576 InterPro IPR023729 K(+)/H(+) antiporter NhaP2
293 297 Phobius NON_CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the extracellular region.
185 209 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
59 76 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
1 5 Phobius NON_CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the extracellular region.
162 179 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
31 53 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
15 388 Pfam PF00999 Sodium/hydrogen exchanger family
15 388 InterPro IPR006153 Cation/H+ exchanger
114 118 Phobius NON_CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the extracellular region.
382 577 Phobius CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the cytoplasm.
411 484 Gene3D G3DSA:3.30.70.1450 -
411 484 InterPro IPR036721 Regulator of K+ conductance, C-terminal domain superfamily
262 272 Phobius CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the cytoplasm.
180 184 Phobius NON_CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the extracellular region.
243 261 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
57 74 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
298 323 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
7 393 Gene3D G3DSA:1.20.1530.20 -
7 393 InterPro IPR038770 Sodium/solute symporter superfamily
119 141 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
494 571 Pfam PF03471 Transporter associated domain
494 571 InterPro IPR005170 Transporter-associated domain
361 383 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
403 485 ProSiteProfiles PS51202 RCK C-terminal domain profile.
403 485 InterPro IPR006037 Regulator of K+ conductance, C-terminal
142 161 Phobius CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the cytoplasm.
195 217 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
238 242 Phobius NON_CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the extracellular region.
216 237 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
24 29 Phobius CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the cytoplasm.
488 571 Gene3D G3DSA:3.30.465.10 -
488 571 InterPro IPR016169 FAD-binding, type PCMH, subdomain 2
273 292 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
87 109 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
492 573 SMART SM01091 CorC_HlyC_2
492 573 InterPro IPR005170 Transporter-associated domain
119 141 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
4 26 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
6 393 FunFam G3DSA:1.20.1530.20:FF:000002 K(+)/H(+) antiporter NhaP2
1 559 PANTHER PTHR32507 NA(+)/H(+) ANTIPORTER 1
210 215 Phobius CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the cytoplasm.
299 321 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
421 483 Pfam PF02080 TrkA-C domain
421 483 InterPro IPR006037 Regulator of K+ conductance, C-terminal
30 53 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
363 381 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
88 113 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
419 483 SUPERFAMILY SSF116726 TrkA C-terminal domain-like
419 483 InterPro IPR036721 Regulator of K+ conductance, C-terminal domain superfamily
324 334 Phobius CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the cytoplasm.
6 23 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
335 357 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
54 58 Phobius NON_CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the extracellular region.
232 254 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
334 356 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
358 362 Phobius NON_CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the extracellular region.
497 571 SUPERFAMILY SSF56176 FAD-binding/transporter-associated domain-like
497 571 InterPro IPR036318 FAD-binding, type PCMH-like superfamily
267 289 TMHMM TMhelix 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
0.777
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Surrounding area
Pocket 2 P2Rank #2
0.651
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Surrounding area
Pocket 3 P2Rank #3
0.315
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Surrounding area
Pocket 4 P2Rank #4
0.24
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Surrounding area
Pocket 5 P2Rank #5
0.179
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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 #6
0.654
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Surrounding area
Pocket 2 FPocket #37
0.533
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Surrounding area
Pocket 3 FPocket #39
0.306 Unusual size
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Surrounding area
Pocket 4 FPocket #22
0.224
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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_A0A0H3GV98
AlphaFold DB full sequence Viewing
ColabFold KP13_01548
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.

54 records
Chemistry signal

Structural ligand evidence is available for this target.

Direct evidence 0 same-protein records
Transferred evidence 4 records from similar proteins
Structural ligands 4 0 loaded crystals
Measured bioactivity 0 direct and transferred ChEMBL records
Proposed compounds 50 similarity-based ZINC candidates
Best available ligand signal
BOG PDB via homolog 292.4 Da · LogP 0.16 · TPSA 99.4 Open detail RCSB PDB
FLC PDB via homolog Detail RCSB PDB
PTY PDB via homolog Detail RCSB PDB
TAM PDB via homolog Detail RCSB PDB
ZINC100034925 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
BOG RCSB PDB Q9UZ55 292.4 Da LogP 0.16 TPSA 99.4 ✓ Ro5 ✓ Clean CCCCCCCCO[C@H]1[C@@H]([C@H]([C@@H]([C@H](O1)CO)…
FLC RCSB PDB Q9UZ55 189.1 Da LogP -5.25 TPSA 140.6 ✓ Ro5 ✓ Clean C(C(=O)[O-])C(CC(=O)[O-])(C(=O)[O-])O
PTY RCSB PDB Q9UZ55 734.1 Da LogP 11.67 TPSA 134.4 2 viol. ✓ Clean CCCCCCCCCCCCCCCCCCCC(=O)O[C@H](COC(=O)CCCCCCCCC…
TAM RCSB PDB Q60362 163.2 Da LogP -1.17 TPSA 86.7 ✓ Ro5 ✓ Clean C(CO)C(CCO)(CCO)N

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.