To determine Kcat, one must obviously know the Vmax at a particular concentration of enzyme, but the beauty of the term is that it is a measure of velocity independent of enzyme concentration, thanks to the term in the denominator.

Oct 1, 2024 · The ratio of kcat to Km (kcat/Km) is an important measure of an enzyme’s efficiency. It combines the rate of catalysis and the affinity of the enzyme for its substrate, providing a comprehensive measure of enzyme performance.

As a beginner, you may find it easier to use Eisenthal & Cornish-Bowden's "direct linear plot" of your data to determine Vmax and Km than a regression of v against [S]. As a non-parametric...

Aug 12, 2020 · Another way to think of it is a measure of how many substrate molecules are converted to product molecules per unit time. Mathematically, it’s defined as Kcat = Vmax/[Enzyme]. Catalytic efficiency, or Kcat/Km, is a measure of an enzyme’s specificity for a particular substrate.

Nov 19, 2016 · Just as kcat k c a t represents the rate of reaction at saturating substrate concentration, kcat/Km k c a t / K m represents the rate of the reaction at negligible substrate concentration. If we take a look at the standard one substrate/one product Michaelis–Menten kinetics rate equation: v = kcat[E][S] Km + [S] v = k c a t [E] [S] K m + [S]

Notice \(k_2\) describes an irreversible reaction as opposed to an equilibrium expression, when compared to k-1 and k1. k2 here is also known as kcat, the catalytic efficiency of enzyme.

Computing Kcat by hand. If you plot enzyme velocity as a function of subtrate concentration, you can fit the data to the Michaelis-Menten equation to determine the K m and V max. The V max is the maximum enzyme velocity extrapolated out to very high concentrations of substrate.

Aug 16, 2016 · Kcat is the turnover of substrate -> product / time & enzyme. Vmax is the maximum rate possible for substrate turnover. As you can imagine, adding more enzyme will allow a higher Vmax.

So your kcat is 3.06e-6 / 37e-9 min -1, that is 82.7 min -1 or - better - 1.38 s -1. If my assumption is wrong, simply convert the change of concentration into an amount, using assay volume...

Jun 13, 2022 · Although the parameter provides critical information on how the enzyme lowers the energy barriers along the reaction pathway for catalysis, kcat / KM is frequently considered as a composite or derived parameter to assess both kcat and KM together rather than as a fundamental kinetic parameter.