Affinity chromatographic methodologies based on immobilized voltage dependent anion channel isoform 1 and application...

Area of Science:

• Biochemistry
• Analytical Chemistry
• Pharmacology

Background:

• Voltage-dependent anion channel isoform 1 (VDAC-1) is crucial for mitochondrial metabolite transport and a target for anti-cancer drugs.
• Developing selective VDAC-1 ligands is vital for targeted cancer therapy.

Purpose of the Study:

• To create a VDAC-1-based bioaffinity chromatographic stationary phase.
• To investigate the binding interactions of key metabolites (ATP, NADH, NADPH) with VDAC-1.
• To screen for VDAC-1-targeting anti-cancer compounds from Rheum officinale Baill.

Main Methods:

• Preparation of a VDAC-1 stationary phase by immobilizing VDAC-1 on lecithin-modified microspheres.
• Utilizing various chromatographic techniques (frontal analysis, nonlinear chromatography) to study VDAC-1-ligand interactions.
• Employing high-performance affinity chromatography coupled with mass spectrometry for compound screening.

Main Results:

• Electrostatic interactions were identified as the primary forces in VDAC-1 ligand binding.
• Consistent association constants were obtained for ATP, NADH, and NADPH binding to VDAC-1 across different methods.
• Chrysophanol, emodin, rhein, aloe-emodin, and catechin were identified as VDAC-1 targeting compounds from Rheum officinale Baill.
• These compounds interact with VDAC-1 at Thr207 and the N-terminal region.

Conclusions:

• The developed VDAC-1 stationary phase is effective for analyzing protein-ligand interactions.
• This method shows promise for screening anti-cancer drugs from complex natural product extracts.
• The identified compounds provide potential leads for VDAC-1-targeted anti-cancer drug development.