Chemistry

Allostery

Allostery



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Kinetics of Allosteric Enzymes

In many enzyme reactions, e.g. in phosphofructokinase and in certain multi-enzyme complexes, reaction courses are observed that cannot be explained by the steady-state kinetics. With these enzymes, the reaction does not start with a linear reaction rate, but is initially characterized by a delay in the course of the reaction. After a delay, the reaction sets in and increases to the linear steady state range, after which it flattens out again due to substrate exhaustion. Such enzymes are called hysteretic enzymes.

Physiologically, a hysteresis has a dampening effect, since short-term substrate changes are not immediately answered with an enzyme reaction.


Video: Allosteric regulation and feedback loops. Biomolecules. MCAT. Khan Academy (August 2022).