ATP synthase: a moonlighting enzyme with unprecedented functions.

Area of Science:

• Biophysics
• Biochemistry
• Bioenergetics

Background:

• ATP synthase is crucial for cellular energy production.
• Chemiosmotic voltage is a key driver of ATP synthesis.
• The role of molecular electrostatic potential in ATP synthase function is not fully understood.

Purpose of the Study:

• To investigate the contribution of ATP synthase's intrinsic molecular electrostatic potential (MESP) to the overall energy landscape.
• To identify and quantify a potential new free energy term associated with ATP synthase.
• To explore the relationship between this new energy term and thermodynamic principles like the Landauer principle.

Main Methods:

• Theoretical analysis of ATP synthase structure and function.
• Computational modeling of molecular electrostatic potential (MESP).
• Thermodynamic calculations.

Main Results:

• ATP synthase's intrinsic MESP constructively reinforces the chemiosmotic voltage.
• A new free energy term, ATP synthase voltage, has been identified.
• This term is approximately equal in magnitude and opposite in sign to the energy dissipated as a Maxwell's demon.

Conclusions:

• The intrinsic MESP of ATP synthase represents a significant, previously overlooked free energy term.
• This ATP synthase voltage may play a role in energy dissipation mechanisms, potentially linking to the Landauer principle.
• Further research is needed to fully elucidate the implications of this finding for bioenergetics.