VDAC as a voltage-dependent mitochondrial gatekeeper under physiological conditions

Area of Science:

• Mitochondrial biology
• Cellular metabolism
• Biophysics

Background:

• Mitochondria are central to eukaryotic energy production via oxidative phosphorylation.
• The mitochondrial outer membrane (MOM) regulates metabolite exchange through voltage-dependent anion channels (VDACs).
• VDACs interact with proteins and molecules, influencing cellular processes.

Purpose of the Study:

• To analyze literature data on targeting mitochondrial VDACs and VDAC-kinase complexes.
• To investigate the hypothesis of outer membrane potential (OMP) generation and its role in cell energy metabolism.
• To refine a model of OMP generation, incorporating VDAC-hexokinase interactions and cytosolic protein docking.

Main Methods:

• Literature review and analysis of experimental data.
• Computational modeling of OMP generation and its effects.
• Integration of VDAC-hexokinase and VDAC-tubulin interactions into a refined model.

Main Results:

• The refined model suggests OMP generation is regulated by VDACs, hexokinase, and cytosolic proteins like tubulin.
• Computational analysis indicates OMP changes, including transient hyperpolarization, may promote apoptosis.
• High concordance between computational estimations and experimental data supports the physiological relevance of OMP generation.

Conclusions:

• VDACs likely act as OMP-dependent gatekeepers of mitochondria, controlling cell fate.
• OMP generation is probable under physiological conditions.
• The proposed model enhances understanding of cancer cell resistance and drug actions targeting VDACs and related interactions in the MOM.