Enzyme Kinetics: Screencasts
Derives the rate expression for an enzyme reaction with a substrate to make a product using the rate-determining step approximation.
We suggest that after watching this screencast, you list the important points as a way to increase retention.
Describes the three types if inhibition of enzyme reactions: competitive, noncompetitive, uncompetitive.
We suggest that after watching this screencast, you list the important points as a way to increase retention.
Important Equations:
Enzyme reactions with no inhibition
The rate of consumption of substrate (
Michaelis-Menten equation
where
A linear plot is obtained by inverting eqn. (a) to yield the Lineweaver-Burke equation
A plot of
Although a linear plot can be obtained, nonlinear regression may be a better way to measure enzyme kinetic parameters (M. Marasovic, T. Marasovic, M. Milos, Robust Nonlinear Regression in Enzyme Kinetic Parameters Estimation, Journal of Chemistry, Vol 2017, Article ID 6560983.)
Enzyme reactions with competitive inhibition
where
A plot of
Enzyme reactions with uncompetitive (anti-competitive) inhibition: The inhibitor binds to the enzyme-substrate complex forming an inhibitor-enzyme-substrate complex.
where
where
A plot of
Enzyme reactions with noncompetitive (mixed) inhibition: The inhibitor can bind to the enzyme or enzyme-substrate complex. The substrate can also bind to the inhibitor-enzyme complex.
where
A plot of
Substrate inhibition: The substrate reacts with an enzyme-substrate complex to form an inactive substrate-enzyme-substrate complex.
where
This plot is not linear because the y-intercept depends on the substrate concentration