kaempferol   Click here for help

GtoPdb Ligand ID: 11052

Synonyms: Robigenin
PDB Ligand
Compound class: Natural product
Comment: Kaempferol is a flavonol, a type of flavonoid, naturally occuring in a variety of plants. It has antibacterial activity against Gram-negative Helicobacter pylori and is reported to inhibit H. pylori HsrA (homeostatic stress regulator) [3].
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Ligand Activity Visualisation Charts

These are box plot that provide a unique visualisation, summarising all the activity data for a ligand taken from ChEMBL and GtoPdb across multiple targets and species. Click on a plot to see the median, interquartile range, low and high data points. A value of zero indicates that no data are available. A separate chart is created for each target, and where possible the algorithm tries to merge ChEMBL and GtoPdb targets by matching them on name and UniProt accession, for each available species. However, please note that inconsistency in naming of targets may lead to data for the same target being reported across multiple charts.

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View interactive charts of activity data across species

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2D Structure
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2D Structure

An image of the ligand's 2D structure. For small molecules with SMILES these are drawn using the NCI/CADD Chemical Identifier Resolver. Click on the image to access the chemical structure search tool with the ligand pre-loaded in the structure editor. For other types of ligands, e.g. longer nucleotides and peptides, a manually drawn representation of the molecule may be provided.

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Physico-chemical Properties
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Physico-chemical Properties

Calculated molecular properties are available for small molecules and natural products (not peptides). Properties were generated using the Chemistry Development Kit (CDK) (Willighagen EL et al. Journal of Cheminformatics vol. 9:33. 2017, doi:10.1186/s13321-017-0220-4; https://cdk.github.io/). All properties were selected to enable the prediction of the Lipinski Rule-of-Five profile or ‘druglikeness’ for each ligand. For more info on each category see the help pages.

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Hydrogen bond acceptors 0
Hydrogen bond donors 4
Rotatable bonds 1
Topological polar surface area 111.13
Molecular weight 286.05
XLogP 3.42
No. Lipinski's rules broken 0

Generated using the Chemistry Development Kit (CDK) (Willighagen EL et al. Journal of Cheminformatics vol. 9:33. 2017, doi:10.1186/s13321-017-0220-4; https://cdk.github.io/)
SMILES / InChI / InChIKey
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SMILES / InChI / InChIKey

SMILES (Simplified Molecular Input Line Entry Specification) A specification for unambiguously describing the structure of chemical molecules using short ASCII strings. Canonical SMILES specify a unique representation of the 2D structure without chiral or isotopic specifications. Isomeric SMILES include chiral specification and isotopes.

Standard InChI (IUPAC International Chemical Identifier) and InChIKey InChI is a non-proprietary, standard, textual identifier for chemical substances designed to facilitate linking of information and database searching. An InChIKey is a simplified version of a full InChI, designed for easier web searching.

Generated using the Chemistry Development Kit (CDK) (Willighagen EL et al. Journal of Cheminformatics vol. 9:33. 2017, doi:10.1186/s13321-017-0220-4; https://cdk.github.io/)

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Canonical SMILES Oc1ccc(cc1)c1oc2cc(O)cc(c2c(=O)c1O)O
Isomeric SMILES Oc1ccc(cc1)c1oc2cc(O)cc(c2c(=O)c1O)O
InChI InChI=1S/C15H10O6/c16-8-3-1-7(2-4-8)15-14(20)13(19)12-10(18)5-9(17)6-11(12)21-15/h1-6,16-18,20H
InChI Key IYRMWMYZSQPJKC-UHFFFAOYSA-N

Generated using the Chemistry Development Kit (CDK) (Willighagen EL et al. Journal of Cheminformatics vol. 9:33. 2017, doi:10.1186/s13321-017-0220-4; https://cdk.github.io/)
Bioactivity Comments
The minimum inhibitory (MIC) and minimum bactericidal (MBC) concentrations for in vitro antibacterial activity against Helicobacter pylori corresponds to the same concentration of kaempferol (8-16 μg/ml) [3].
Selectivity at enzymes
Key to terms and symbols Click column headers to sort
Target Sp. Type Action Value Parameter Concentration range (M) Reference
carbonic anhydrase 7 Hs Inhibitor Inhibition 7.6 pKi - 4
⤷ pKi 7.6 (Ki 2.5x10-8 M) [4]
CYP2A13 Hs Inhibitor Inhibition 6.9 pKi - 1
⤷ pKi 6.9 (Ki 1.2x10-7 M) [1]
Selectivity at catalytic receptors
Key to terms and symbols Click column headers to sort
Target Sp. Type Action Value Parameter Concentration range (M) Reference
epidermal growth factor receptor Hs Inhibitor Inhibition 6.1 pIC50 - 2
⤷ pIC50 6.1 (IC50 8.58x10-7 M) [2]