Functional plasticity and evolutionary adaptation of allosteric regulation

Area of Science:

• Biochemistry
• Molecular Biology
• Protein Dynamics

Background:

• Allostery is a key regulatory mechanism in protein function.
• Current understanding relies heavily on structure-centric models, limiting insight into allostery's decentralized nature.

Purpose of the Study:

• To explore the molecular basis and functional landscape of allostery.
• To present a function-centric approach using deep mutational scanning.

Main Methods:

• Deep mutational scanning was employed to analyze allosteric signaling.
• Investigated the functional plasticity and redundancy of allosteric pathways.

Main Results:

• Allosteric signaling demonstrates significant functional plasticity and redundancy via numerous mutational routes.
• Residues vital for allosteric signaling are poorly conserved, unlike highly conserved structural residues.
• Evolutionary pressure favors preserving protein fold over specific allosteric function.

Conclusions:

• The study challenges the view of a single, finely tuned allosteric network.
• Multiple evolutionary strategies can achieve cooperative thermodynamic conditions.
• Protein structure conservation plays a more dominant role than functional conservation in allosteric regulation.