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Dose any enzyme follow the Michaelis-Menten equation?
Molecular and Cellular Biochemistry
|May 3, 1977
Summary
Most enzymes do not follow Michaelis-Menten kinetics, contrary to common assumptions. A review of steady-state kinetics studies revealed over 800 enzymes exhibiting complex behaviors, challenging the widespread applicability of this fundamental enzyme kinetics model.
Area of Science:
- Biochemistry
- Enzyme kinetics
- Molecular biology
Background:
- The Michaelis-Menten equation is a cornerstone of enzyme kinetics, widely assumed to describe enzyme behavior.
- However, the extent to which enzymes truly adhere to this model under various conditions has been questioned.
Purpose of the Study:
- To systematically review literature from 1965-1976 to assess deviations from Michaelis-Menten kinetics.
- To classify enzymes exhibiting complex kinetics and analyze reported explanations for these deviations.
Main Methods:
- Conducted a comprehensive literature search focusing on steady-state kinetics studies.
- Classified over 800 enzymes reported with complex kinetic curves.
- Determined the minimum degree of rate equations for highly complex curves.
Main Results:
- Over 800 enzymes were found to exhibit deviations from Michaelis-Menten kinetics.
- A detailed classification of enzyme variations and their reported causes was compiled.
- Few studies rigorously tested adherence to the Michaelis-Menten equation across diverse conditions, often revealing unexpected complexities.
Conclusions:
- The assumption that most enzymes follow Michaelis-Menten kinetics is not supported by the available literature.
- Enzyme kinetics are frequently more complex than the simplified Michaelis-Menten model suggests.
- Further research is needed to understand the prevalence and mechanisms of complex enzyme kinetics.