Dominance analysis to assess solute contributions to multicomponent phase equilibria

Area of Science:

• Biochemistry
• Cell Biology
• Physical Chemistry

Background:

• Biomolecular condensates form through liquid-liquid phase separation in cells.
• These membraneless organelles contain numerous solutes, influencing their formation and function.
• Understanding the contribution of individual solutes to phase separation is crucial.

Purpose of the Study:

• To introduce a new theoretical framework, energy dominance analysis, to determine the driving forces of phase separation.
• To provide a method for quantifying the contribution of individual solutes to condensate formation.

Main Methods:

• Developed a formalism based on phase equilibria in multi-component systems.
• Analyzed shapes of dilute phase boundaries and tie line slopes.
• Assessed changes in dilute phase concentrations under solute perturbations.

Main Results:

• The energy dominance analysis framework is theoretically sound and experimentally applicable.
• Demonstrated the accuracy and flexibility of the method using simulations and experimental data.
• The approach allows for the identification of dominant solutes driving phase separation.

Conclusions:

• Energy dominance analysis offers a robust method to dissect the forces governing biomolecular condensate formation.
• This framework facilitates understanding the complex interplay of solutes in cellular phase separation.
• The approach is valuable for both theoretical and experimental investigations in cell biology.