Water-mediated biomolecular dynamics and allostery

Area of Science:

• Biophysics
• Structural Biology
• Biochemistry

Background:

• Dynamic coupling with water influences biomolecular function.
• Protein-confined water plays a role in allosteric regulation.
• Understanding these interactions is key to deciphering biological mechanisms.

Purpose of the Study:

• To investigate the role of protein-water dynamics in regulating biomolecular function.
• To explore the influence of confined water on allosteric regulation in specific protein systems.
• To illustrate these properties using hemoglobin and an adenosine receptor.

Main Methods:

• Analysis of protein-water dynamics.
• Focus on partially confined water and its role in allosteric regulation.
• Case studies involving Scapharca inaequivalvis hemoglobin (HbI) and A2A adenosine receptor (A2AAR).

Main Results:

• Water-protein interactions affect protein dynamics in HbI, coupling ligand binding to water contact dynamics.
• Hydration waters within A2AAR form an allosteric network of water-mediated contacts.
• This network extends from the ligand-binding pocket to the G-protein site, regulating receptor activity.

Conclusions:

• Protein-confined water dynamics are integral to the functional regulation of biomolecules.
• Water-mediated interactions are critical for allosteric regulation in proteins like HbI and A2AAR.
• The findings provide insights into the molecular mechanisms of allosteric control mediated by water.