6Y9S

Crystal structure of GSK-3b in complex with the imidazo[1,5-a]pyridine-3-carboxamide inhibitor 16

Summary for 6Y9S

• Entry DOI: 10.2210/pdb6y9s/pdb
• Descriptor: Glycogen synthase kinase-3 beta, ~{N}-(oxan-4-ylmethyl)-6-(5-propan-2-yloxypyridin-3-yl)imidazo[1,5-a]pyridine-3-carboxamide, ACETATE ION, ... (4 entities in total)
• Functional Keywords: glycogen synthase kinase-3 beta, indazole, inhibitor, kinase, transferase, proteros biostructures gmbh
• Biological source: Homo sapiens (Human)
• Total number of polymer chains: 2
• Total formula weight: 80731.61

Authors

Krapp, S.,Griessner, A.,Blaesse, M.,Buonfiglio, R.,Ombrato, R. (deposition date: 2020-03-10, release date: 2020-05-20, Last modification date: 2024-10-23)

Primary citation

Buonfiglio, R.,Prati, F.,Bischetti, M.,Cavarischia, C.,Furlotti, G.,Ombrato, R.
Discovery of Novel Imidazopyridine GSK-3 beta Inhibitors Supported by Computational Approaches.
Molecules, 25:-, 2020

PubMed Abstract: The interest of research groups and pharmaceutical companies to discover novel GSK-3β inhibitors has increased over the years considering the involvement of this enzyme in many pathophysiological processes and diseases. Along this line, we recently reported on 1H-indazole-3-carboxamide (INDZ) derivatives -, showing good GSK-3β inhibition activity. However, they suffered from generally poor central nervous system (CNS) permeability. Here, we describe the design, synthesis, and in vitro characterization of novel imidazo[1,5-a]pyridine-1-carboxamide (IMID 1) and imidazo[1,5-a]pyridine-3-carboxamide (IMID 2) compounds (-) to overcome such liability. In detail, structure-based approaches and fine-tuning of physicochemical properties guided the design of derivatives - resulting in ameliorated absorption, distribution, metabolism, and excretion (ADME) properties. A crystal structure of in complex with GSK-3β enzyme (PDB entry 6Y9S) confirmed the in silico models. Despite the nanomolar inhibition activity, the new core compounds showed a reduction in potency with respect to INDZ derivatives -. In this context, Molecular Dynamics (MD) and Quantum Mechanics (QM) based approaches along with NMR investigation helped to rationalize the observed structure activity relationship (SAR). With these findings, the key role of the acidic hydrogen of the central core for a tight interaction within the ATP pocket of the enzyme reflecting in good GSK-3β affinity was demonstrated.

PubMed: 32380735
DOI: 10.3390/molecules25092163

Experimental method

X-RAY DIFFRACTION (2.03 Å)