Here's why:
* Lock and Key Model (Outdated): This older model suggested a rigid fit, like a key in a lock. However, enzymes are flexible molecules.
* Induced Fit Model (Current): This model recognizes that the enzyme's active site is not perfectly complementary to the substrate initially. Instead, the binding of the substrate induces a conformational change in the enzyme, allowing for a tighter, more specific fit.
Key points of the induced fit model:
* Flexibility: The enzyme's active site can change shape slightly.
* Specificity: The induced fit enhances the enzyme's specificity for its substrate.
* Catalysis: The conformational change facilitates the chemical reaction by bringing the substrate into the optimal position for catalysis.
In summary, the induced fit model explains the dynamic nature of enzyme-substrate interactions, emphasizing the importance of both the substrate and the enzyme's ability to adapt for optimal binding and catalysis.
