DRP1 interacts directly with BAX to induce its activation and apoptosis

Area of Science:

• Cell Biology
• Molecular Biology
• Biochemistry

Background:

• BAX and DRP1 are key proteins in apoptosis, known to co-localize at mitochondria.
• The molecular mechanisms and functional outcomes of BAX-DRP1 interplay are not well understood.

Purpose of the Study:

• To elucidate the molecular basis of the interaction between BAX and DRP1.
• To determine the functional consequences of BAX-DRP1 complex formation on mitochondrial apoptosis.

Main Methods:

• Co-immunoprecipitation to detect BAX-DRP1 interaction.
• Membrane-based assays to study protein activity.
• Mitochondrial localization studies.
• Induction of apoptosis using specific triggers and forced dimerization.

Main Results:

• BAX and DRP1 physically interact, with enhanced binding during apoptosis.
• Complex formation occurs in a membrane environment and involves the BAX N-terminal region.
• The BAX-DRP1 association boosts the membrane-associated activity of both proteins.
• Forced dimerization of BAX and DRP1 leads to mitochondrial translocation, remodeling, and permeabilization, inducing apoptosis.

Conclusions:

• DRP1 acts as a noncanonical activator of BAX through direct physical interaction.
• This BAX-DRP1 interplay is a critical mechanism driving mitochondrial apoptosis.
• Targeting the BAX-DRP1 interaction could offer new therapeutic strategies for apoptosis-related diseases.