ralimetinib   Click here for help

GtoPdb Ligand ID: 7959

Synonyms: LY-2228820 | LY-2228820 free base | LY2228820
PDB Ligand
Compound class: Synthetic organic
Comment: Ralimetinib was developed as a potent and selective, ATP-competitive inhibitor of p38 MAPK α and β (MAPK14 and MAPK11 respectively) [3,6]. The compound is delivered orally as the dimesylate salt (PubChem CID 11570805). It is compound 40 in Mader et al. (2008) [4].
In 2023, a report in Cell Chemical Biology demonstrated that the anticancer activity of ralimetinib is in fact due to inhibition of EGFR function, despite the compound being >30-fold less potent against EGFR than it is against p38α [1]. This study found that sensitivity of tumour cells to ralimetinib was retained when p38α and p38β genes were knocked-out, and that the EGFRT790M (gatekeeper) mutation conferred resistance to both ralimetinib and the approved EGFR inhibitor gefitinib. The cocrystal structure of ralimetinib bound to the EGFR confirmed the EGFR hypothesis.

SARS-CoV-2: p38 MAPK activity has been reported to be upregulated following SARS-CoV-2 infection of host cells in vitro. Ralimetinib produces an antiviral effect with an IC50 of 873 nM [2].
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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
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 CDK toolkit. 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 4
Hydrogen bond donors 2
Rotatable bonds 5
Topological polar surface area 85.41
Molecular weight 420.24
XLogP 5.63
No. Lipinski's rules broken 1
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.

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Canonical SMILES Fc1ccc(cc1)c1nc([nH]c1c1ccc2c(n1)n(CC(C)(C)C)c(n2)N)C(C)(C)C
Isomeric SMILES Fc1ccc(cc1)c1nc([nH]c1c1ccc2c(n1)n(CC(C)(C)C)c(n2)N)C(C)(C)C
InChI InChI=1S/C24H29FN6/c1-23(2,3)13-31-20-17(28-22(31)26)12-11-16(27-20)19-18(14-7-9-15(25)10-8-14)29-21(30-19)24(4,5)6/h7-12H,13H2,1-6H3,(H2,26,28)(H,29,30)
InChI Key XPPBBJCBDOEXDN-UHFFFAOYSA-N
Bioactivity Comments
LY2228820 effects significant tumour growth inhibition in multiple cancer models in vivo, including those for melanoma, non-small cell lung cancer, ovarian cancer, glioma, myeloma and breast cancer [3].
Selectivity at enzymes
Key to terms and symbols Click column headers to sort
Target Sp. Type Action Value Parameter Concentration range (M) Reference
mitogen-activated protein kinase 11 Hs Inhibitor Inhibition 9.0 pIC50 - 1
⤷ pIC50 9.0 (IC50 1x10-9 M) [1]
mitogen-activated protein kinase 14 Hs Inhibitor Inhibition 8.1 – 8.4 pIC50 - 1,4
⤷ pIC50 8.4 (IC50 4x10-9 M) [1]
pIC50 8.1 (IC50 7x10-9 M) [4]
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 5.2 – 8.0 pIC50 - 1
⤷ pIC50 8.0 (IC50 1.1x10-8 M) [1]
Description: Inhibitor potency for EGFRG719C
pIC50 6.7 (IC50 1.8x10-7 M) [1]
Description: Inhibitor potency for WT EGFR
pIC50 5.2 (IC50 6.06x10-6 M) [1]
Description: Inhibitor potency for EGFR with gatekeeper mutation T790M