Biology – 5.1 Enzymes | e-Consult

Enzymes are proteins, and their three-dimensional structure is crucial for their function. This structure is maintained by various bonds, including hydrogen bonds, ionic bonds, and disulfide bridges. pH is a major factor influencing these bonds.

Effect of pH on Enzyme Shape: Changes in pH can disrupt the ionic bonds and hydrogen bonds that hold the enzyme's structure together. Extreme pH values (either very acidic or very alkaline) can cause the enzyme to unfold, leading to a loss of its specific three-dimensional shape. This process is called denaturation.

Active Site and Functionality: The active site is a specific region on the enzyme where the substrate binds. The shape of the active site is complementary to the shape of the substrate, allowing for a precise interaction. When the enzyme denatures, the active site loses its shape and can no longer bind to the substrate effectively. This reduces or eliminates the enzyme's catalytic activity.

In summary, extreme pH values can cause denaturation, altering the enzyme's shape and rendering the active site unable to bind the substrate, thus reducing or stopping the enzyme's function.