Introduction

To fully understand how a protein’s structure can be identified, we must first understand it’s physical and chemical properties.

Basically a protein simply has 5 properties - 3 physical and 2 chemical.

3 Physical Properties:

• Shape: Proteins can have globular (spherical) or fibrous (elongated) structures, impacting their behavior in solutions and their separation.
• Size: Determined by molecular weight and dimensions, crucial for techniques like SDS-PAGE and size-exclusion chromatography.
• Composition: The types and sequences of amino acids in the protein, influencing structure and function.

We sort the physical properties by identifying the size and composition of a protein. Furthermore, the idea of a Stokes Radius:

Stokes Radius

The Stokes radius in protein science refers to the effective size of a protein in solution, accounting for its shape and hydration shell, which influences its diffusion and mobility.

2 Chemical Properties:

• Charge: Determined by amino acid residues (acidic - glutamic acid, basic - lysine).
• Hydrophobicity/Hydrophilicity: Affects solubility and molecular interactions.