Now, if we take the following equation and we solve for the rate constant of this reaction, K two, we get the following equation. So K two, the rate constant of this reaction here is equal to V max divided by E total. And this has an important physiological meaning. This K two is also known as K cat and this is given the name of the turnover number of the enzyme. So what exactly is the physiological meaning of the turnover number K two of an enzyme? Well, the turnover number tells us the maximum number of the substrate molecules that are transformed into the product molecules by a single active side per given unit of time.