Structural Study of Selectivity Mechanisms for JNK3 and p38α with Indazole Scaffold Probing Compounds

Area of Science:

• Medicinal Chemistry
• Structural Biology
• Computational Chemistry

Background:

• Developing selective kinase inhibitors is crucial due to conserved ATP binding sites.
• JNKs and p38α are important kinase targets, with thiophene-indazole scaffolds showing promise for selectivity.
• Previous efforts have identified scaffolds with isoform selectivity for JNKs and selectivity for p38α.

Purpose of the Study:

• To investigate the molecular mechanisms underlying the selectivity of thiophene-indazole compounds for JNK3 and p38α.
• To understand the critical interactions governing the affinity and selectivity of these inhibitors.
• To provide insights for the development of next-generation JNK3 isoform inhibitors.

Main Methods:

• Utilized four thiophene-indazole derived compounds.
• Determined crystal structures of inhibitors bound to JNK3 or p38α.
• Performed molecular dynamics (MD) simulations to analyze binding mechanisms.

Main Results:

• Elucidated specific binding interactions responsible for selectivity between JNK3 and p38α.
• Identified key structural features of the thiophene-indazole scaffold that confer selectivity.
• Provided atomic-level understanding of inhibitor-kinase interactions.

Conclusions:

• The study offers valuable insights into the structure-activity relationships of thiophene-indazole inhibitors.
• Findings will guide the optimization of current lead compounds.
• Facilitates the design of novel, highly selective JNK3 isoform inhibitors.