Erv1 and Cytochrome c Mediate Rapid Electron Transfer via A Collision-Type Interaction

Area of Science:

• Biochemistry
• Mitochondrial Biology
• Protein Interactions

Background:

• The mitochondrial disulfide relay is crucial for oxidative protein folding.
• This process depends on electron transfer (ET) from Erv1 to cytochrome c (Cc).

Purpose of the Study:

• To investigate the interaction mechanism between yeast cytochrome c and Erv1.
• To understand how this interaction facilitates electron transfer without stable complex formation.

Main Methods:

• Solution NMR spectroscopy was used to study the yeast Cc-Erv1 system.
• Molecular modeling was employed to rationalize the observed transient interactions.

Main Results:

• The yeast Cc-Erv1 system is functionally active.
• No stable, observable binding between Cc and Erv1 was detected.
• A collision-type mechanism facilitates fast ET from Erv1 to Cc over a large surface area.

Conclusions:

• Mitochondrial electron transfer between Cc and Erv1 occurs through transient, collision-based interactions.
• This mechanism avoids canonical protein complex formation.
• The interaction likely prevents direct ET to molecular oxygen, offering protection against reactive oxygen species.