I found the lectures earlier this month pertaining to enzyme mechanisms really interesting, especially our discussion of the Induced Fit Model. Although I had learned about enzymes before, this deeper exploration of how they “bind to the transition state better than to the substrate” was particularly intriguing. We often learn that enzymes lower the activation energy of a reaction, but understanding how they accomplish this, by stabilizing the substrate in its high-energy configuration, added a new level of complexity to the concepts I’d previously learned. What really caught my attention was learning that ACE inhibitors are designed as transition-state analogues. I found it fascinating to connect this molecular-level design principle to something with such real-world medical importance, especially since my grandmother takes ACE inhibitors daily for high blood pressure. It was insightful to see how this understanding of enzyme chemistry directly translates into effective drug design. In analyzing the ACE active site, I was intrigued by how elegantly it is structured, with precise electrostatic, hydrogen-bonding, and salt-bridge molecular interactions that favor the transition form of the substrate rather than its starting configuration. The idea that subtle molecular mimicry can improve health outcomes made me appreciate just how powerful biochemical insight can be.
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We have all been exposed to the lock and key model, like you said, and I find it interesting that it always comes back and is relevant. When we learned that enzymes bind to Transition State (TS) better than substrate, it made my head scratch for a bit because until this class I was never aware of that. And the reason as to why enzymes lower the TS is because the enzyme is fit to the TS rather than the substrate.
I agree that going beyond the “lock and key” model explanation has deepened my perspective and accuracy of how enzymes work. I was surprised to learn that the Ea actually increases when the enzyme is complementary to the substrate. The Ea actually decreases when the enzyme is complementary to the transition state. We also learned that enzymes cause close proximity that encourages substrates to react, and that enzymes can act as acids, bases, or nucleophiles.
I also had a similar experience when learning about enzymes in this class. Enzymes are one of those topics you often encounter in an introductory biology class, but their underlying mechanisms are rarely explained or fully understood. It’s also more satisfying to deepen your understanding of something you’re already familiar with, rather than learning an entirely new concept from scratch.