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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2D Structure
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Physico-chemical Properties
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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
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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)
1. Bhattacharjee D, Bakar J, Chitnis SP, Sausville EL, Ashtekar KD, Mendelson BE, Long K, Smith JC, Heppner DE, Sheltzer JM. (2023)
Inhibition of a lower potency target drives the anticancer activity of a clinical p38 inhibitor.
Cell Chem Biol, 30 (10): 1211-1222.e5. [PMID:37827156]
2. Bouhaddou M, Memon D, Meyer B, White KM, Rezelj VV, Marrero MC, Polacco BJ, Melnyk JE, Ulferts S, Kaake RM. (2020)
The Global Phosphorylation Landscape of SARS-CoV-2 Infection.
Cell, Article Online Now. DOI: 10.1016/j.cell.2020.06.034
3. Campbell RM, Anderson BD, Brooks NA, Brooks HB, Chan EM, De Dios A, Gilmour R, Graff JR, Jambrina E, Mader M et al.. (2014)
Characterization of LY2228820 dimesylate, a potent and selective inhibitor of p38 MAPK with antitumor activity.
Mol Cancer Ther, 13 (2): 364-74. [PMID:24356814]
4. Mader M, de Dios A, Shih C, Bonjouklian R, Li T, White W, López de Uralde B, Sánchez-Martinez C, del Prado M, Jaramillo C et al.. (2008)
Imidazolyl benzimidazoles and imidazo[4,5-b]pyridines as potent p38alpha MAP kinase inhibitors with excellent in vivo antiinflammatory properties.
Bioorg Med Chem Lett, 18 (1): 179-83. [PMID:18039577]
5. Patnaik A, Haluska P, Tolcher AW, Erlichman C, Papadopoulos KP, Lensing JL, Beeram M, Molina JR, Rasco DW, Arcos RR et al.. (2016)
A First-in-Human Phase I Study of the Oral p38 MAPK Inhibitor, Ralimetinib (LY2228820 Dimesylate), in Patients with Advanced Cancer.
Clin Cancer Res, 22 (5): 1095-102. [PMID:26581242]
6. Tate CM, Blosser W, Wyss L, Evans G, Xue Q, Pan Y, Stancato L. (2013)
LY2228820 dimesylate, a selective inhibitor of p38 mitogen-activated protein kinase, reduces angiogenic endothelial cord formation in vitro and in vivo.
J Biol Chem, 288 (9): 6743-53. [PMID:23335506]