* Proteins are Sensitive to Heat: Enzymes are proteins, and proteins are complex molecules with intricate three-dimensional shapes. This shape is essential for their function – the specific shape of an enzyme's active site allows it to bind to a specific substrate and catalyze a reaction.
* Heat Disrupts Bonds: When you increase the temperature, you provide more energy to the molecules. This energy can disrupt the weak bonds (hydrogen bonds, van der Waals forces) that help hold the protein's structure together.
* Shape Changes: As these bonds break, the enzyme molecule starts to unfold and lose its original shape. This process is called denaturation.
* Loss of Function: The denatured enzyme no longer has the correct active site shape to bind to its substrate. This means it can't catalyze the reaction it was designed for, effectively losing its function.
Think of it like this: Imagine a key and a lock. The key (enzyme) has a specific shape that allows it to fit into the lock (substrate). Heat acts like a hammer, smashing the key and changing its shape, so it no longer fits into the lock.
In summary: High temperatures disrupt the weak bonds within an enzyme's structure, causing it to unfold and change shape, leading to a loss of function.
