Condensates as Conformation Editors of Disordered Client Proteins

Area of Science:

• Biochemistry
• Biophysics
• Cell Biology

Background:

• Biomolecular condensates are crucial for cellular organization.
• They modulate biochemistry by concentrating molecules and altering protein conformations.
• Principles governing condensate-induced protein conformational changes are not well understood.

Purpose of the Study:

• To investigate how diverse condensate environments remodel disordered client proteins.
• To identify factors governing this conformational remodeling process.
• To elucidate the role of scaffold properties and sequence grammar in client protein conformation.

Main Methods:

• Utilized coarse-grained simulations to model biomolecular condensates and client proteins.
• Analyzed the impact of scaffold properties, including sticker clustering and chain length, on client protein dynamics.
• Examined client-condensate interaction maps to understand remodeling mechanisms.

Main Results:

• Demonstrated that condensate environments remodel disordered client proteins in a scaffold-specific manner.
• Identified linear patterning of scaffold interaction motifs (sticker clustering) as a key factor in conformational editing.
• Showed that increased scaffold chain length primarily slows client dynamics without altering intrachain contacts.
• Revealed that client-condensate interactions are shaped by emergent condensate architecture.

Conclusions:

• Biomolecular condensates act as sophisticated regulators of recruited disordered client protein conformation.
• Conformational remodeling is influenced by scaffold architecture and sequence grammar.
• Findings have broad implications for understanding cellular regulation and developing therapeutic interventions.