1. The Heat Breaks Bonds:
* Hydrogen bonds: These weak bonds hold the protein's secondary and tertiary structures together. Heat disrupts these bonds, causing the protein to unfold.
* Hydrophobic interactions: These interactions, which keep nonpolar amino acids clustered together, are also disrupted by heat.
* Disulfide bridges: These stronger bonds can withstand some heat, but prolonged boiling can break even these.
2. Denaturation:
* The unfolding of the protein is called denaturation. The enzyme loses its specific three-dimensional shape.
3. Loss of Function:
* The enzyme's active site, the region that binds to the substrate, is no longer in the correct conformation. This means the enzyme can no longer catalyze its specific reaction.
Think of it like this: Imagine the enzyme as a key that fits perfectly into a lock (the substrate). Boiling the enzyme is like bending the key out of shape, so it no longer fits the lock.
Important Note: While boiling enzymes permanently denatures them, some enzymes can be partially or fully reactivated under specific conditions, depending on the enzyme and the denaturation process.
