Human Serum Albumin: 3D Insight on Protein Hydration.

Area of Science:

• Biochemistry
• Biophysics
• Computational Chemistry

Background:

• Human serum albumin (HSA) is a key protein in blood plasma, acting as a transporter for various molecules.
• Protein hydration is essential for maintaining protein structure, function, and ligand-binding capabilities.

Purpose of the Study:

• To present a generalized model of human serum albumin (HSA) hydration structure.
• To investigate the hydration layer thickness and the role of water in HSA-ligand binding.

Main Methods:

• Utilized the three-dimensional Reference Interaction Site Model (3D-RISM) theory of solvation.
• Analyzed 3D isodensity maps and calculated structural parameters like hydration numbers and SASA.

Main Results:

• Reconstructed the most probable model of HSA hydration structure.
• Provided detailed analysis of hydration layer thickness and the state of water during HSA-ligand interactions.
• Quantified hydration numbers, hydration layer thickness, and fraction of hydrogen bonds.

Conclusions:

• The study offers a comprehensive understanding of HSA hydration and its relationship with the solvent.
• New insights into protein hydration and its influence on ligand binding are provided.