Which of the following changes occur due to denaturation of protein ? (A) Peptide bonds of the protein are readily available for hydrolysis (B) Solubility of protein increases (C) The viscosity decreases (D) Solubility of protein decreases (E) Biological properties such as catalytic, hormonal are lost Choose the correct answer from the options given below :
Protein Denaturation: Key Changes
Protein denaturation involves the disruption of the protein's native three-dimensional structure, primarily affecting secondary, tertiary, and quaternary structures, without breaking the peptide bonds that form the primary structure.
Consequences of Denaturation
Several changes occur upon denaturation:
- Increased Hydrolysis Accessibility: Denaturation unfolds the protein, exposing the internal peptide bonds. This makes them more readily available for hydrolysis reactions catalyzed by acids, bases, or enzymes. This corresponds to option (A).
- Decreased Solubility: As the protein unfolds, hydrophobic amino acid residues buried within the core become exposed to the solvent. These hydrophobic regions tend to associate with each other, leading to protein aggregation and a significant decrease in solubility. This corresponds to option (D).
- Loss of Biological Properties: The specific three-dimensional structure of a protein dictates its biological function, such as enzymatic activity or hormonal signaling. Denaturation destroys this precise structure, resulting in the loss of these specific biological properties. This corresponds to option (E).
Changes Not Typically Observed
Certain changes are contrary to what happens during denaturation:
- Solubility generally decreases, not increases (contrary to option B).
- Viscosity often increases due to unfolding and potential aggregation, rather than decreasing (contrary to option C).
Therefore, the changes observed due to denaturation are (A), (D), and (E).
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