[Stabilization of protein by saccharose by spin marker method data]

Area of Science:

• Biophysical chemistry
• Protein dynamics
• Solution thermodynamics

Context:

• Investigating the effects of solutes on protein structure and dynamics.
• Utilizing spin-labeling techniques to probe protein environments.
• Applying chemical exchange models to understand water-protein interactions.

Purpose:

• To elucidate the impact of sucrose on the water-protein matrix of human serum albumin (HSA).
• To quantify thermodynamic parameters associated with sucrose-induced structural changes.
• To understand how sucrose affects water layers within protein hydrophobic cavities.

Summary:

• Human serum albumin (HSA) was covalently modified with a maleimide spin-label.
• A chemical exchange model for water layers (inner A, outer B) within the protein matrix was employed.
• Analysis of van't-Hoff plots revealed that increasing sucrose concentration alters thermodynamic parameters, inducing negative disjointing pressure.

Impact:

• Sucrose forces water out of hydrophobic protein cavities, reducing structural flexibility.
• The study reveals sucrose's role in modulating protein dynamics and water-protein interactions.
• Findings contribute to understanding osmolytes' effects on protein stability and function.