Sequence of Events in an Enzyme-Controlled Reaction

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An enzyme is a protein that acts as catalyst. Find out about a sequence of events in an enzyme-controlled reaction with help from an experienced educator in this free video clip.

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Hi, I'm Robin Higgins and this, "The sequence of events in an enzyme-controlled reaction". Okay, so, just to review, an enzyme is a protein that act as catalyst. And so, let's say we have our reactants that want to go to our products, there's always going to be an activation energy. And so, we can lower the activation energy by creating different pathway of making this reaction happen. And that lowers the activation energy enough, so what the enzyme does, it creates a new pathway so that this hump isn't as high. And then, you have a faster reaction and so, you're able to continue life as you know it. Alright, so, what's the sequence of events for this happening. Well, without the enzymes, if you just have A plus B goes to C, then, basically you're on your own waiting for A B to knock together to form C. And so, that may happen quickly, it might happen very slowly. Now, with the enzymes, you're going to have a large, compare to the large protein, we're just going to draw it like this because it's easier to draw, but in reality it has a very complex 3D shape. Okay, so, now let's say that we have a is actually this circle. And let's say B looks like this little triangle, and then C ends up being a circle with a triangle on it. Okay, so let's say that this, the way that this enzyme works is that it actually has a bunch of B inside of it, or it's able to get it from some other place. And so, the first step would be that you have A entering into the enzyme, or substrate binding. And so, the next step is that you'll have A actually in here and it will start to have a chemical change. And so, after that's like that, eventually you'll create a C. And after you created your chemical reaction, the last step will be completely releasing your new product. So, in total, we created three basic steps and that was enzyme substrate binding, the chemical reaction and substrate release. I'm Robin Higgins and this is, "What are the steps on the pathway of an enzyme reaction?"

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