5.6 Enzyme Inhibition – Explained in Simple Words
🔹 What is Enzyme Inhibition?
Imagine enzymes as workers in a factory who help complete specific tasks quickly—like assembling a product. But sometimes, someone or something comes in and stops the workers from doing their job. That “something” is called an inhibitor.
- An inhibitor is a chemical that attaches to an enzyme and stops or slows down its activity.
- The enzyme cannot carry out its job (i.e., converting substrate into product).
- This stopping process is called enzyme inhibition.
Key point: The inhibitor is not changed or used up during this process—it just blocks the enzyme.
🔹 How Does Inhibition Work?
Enzyme inhibition can happen in two ways:
- The inhibitor blocks the active site (the part where the substrate binds).
- The inhibitor changes the shape of the enzyme so the substrate can no longer fit.
Let’s understand more with some real-life examples.
🧪 Example: Aspirin (a useful inhibitor)
- Aspirin is a medicine that works by blocking the enzymes responsible for producing prostaglandins.
- Prostaglandins are chemicals that cause pain and inflammation in our body.
- By blocking the enzyme, aspirin reduces pain and swelling. This is why we use aspirin for headaches or fever.
☠️ Example: Cyanide (a harmful inhibitor)
- Cyanide is a poison.
- It blocks an enzyme called cytochrome oxidase which is essential for cellular respiration—the process by which our cells make energy.
- When this enzyme is blocked, cells can’t produce energy, and this can quickly lead to death.