compound 76 [PMID: 28657314]   Click here for help

GtoPdb Ligand ID: 9609

Immunopharmacology Ligand
Compound class: Synthetic organic
Comment: This is the most potent compound developed via a pharmacophore and docking-based virtual screening campaign aimed at the discovery of small molecule inhibitors of the IL-15/IL-15R interaction [2]. Specifically, the investigators were searching for compounds that inhibit IL-15 binding to the IL-2Rβ subunit which together with the γ subunit, forms the signal transducing component of the IL-15R complex. Although the compound was found to be non-selective for IL-15 over IL-2, as a first in vitro SAR study it provides crucial information on the key binding interactions of IL-15 with its IL-2Rβ binding site, that will be useful for futher compound optimisation.
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 8
Hydrogen bond donors 1
Rotatable bonds 16
Topological polar surface area 146.3
Molecular weight 576.25
XLogP 7.29
No. Lipinski's rules broken 2
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 CCOC(=O)c1cccc(c1)NC(=O)CCCCCCCSc1nnc(n1C)Cc1nn(C)c(=O)c2c1cccc2
Isomeric SMILES CCOC(=O)c1cccc(c1)NC(=O)CCCCCCCSc1nnc(n1C)Cc1nn(C)c(=O)c2c1cccc2
InChI InChI=1S/C30H36N6O4S/c1-4-40-29(39)21-13-12-14-22(19-21)31-27(37)17-8-6-5-7-11-18-41-30-33-32-26(35(30)2)20-25-23-15-9-10-16-24(23)28(38)36(3)34-25/h9-10,12-16,19H,4-8,11,17-18,20H2,1-3H3,(H,31,37)
InChI Key GWNFQAKCJYEJEW-UHFFFAOYSA-N
Bioactivity Comments
Compound 76 binds to IL-15 (specifically to an IL-15 superagonist called RLI that is a fusion protein linking IL-15 to the IL-15Rα sushi domain [1], used to exclude this interface from the analysis), and is biologically active as an inhibitor of IL-15-induced Stat5 phosphorylation (IC50 57nM) and IL-15-induced proliferation of 32Dβ cells which express IL-2Rβ/γ. Unfortunately it also inhibits IL-2 activity in the same assays (IC50 43nM for inhibition of IL-2-induced Stat5 phosphorylation), so is not selective for IL-15 activity.
Selectivity at ligand targets
Key to terms and symbols Click column headers to sort
Target Sp. Type Action Value Parameter Concentration range (M) Reference
IL-15 Hs Antagonist Antagonist 4.7 pKd - 2
⤷ pKd 4.7 (Kd 2.18x10-5 M) [2]
Description: By SPR binding to the IL-15 superagonist RLI.