Zusammenfassung der Ressource
Properties of Enzymes
- Allosteric Enzymes
- regulatory enzymes
- do not follow the Michaelis-Menton kinetics
- Isozymes
- same reaction is catalysed by a number different enzymes
- common evolutionary ancestor
- differ in substrate affinities or regulatory properties
- Enzyme Cofactors and Activators
- often require cofactors for activity
- if the cofactor is an organic compound not
a metal it is known as a prosthetic group
- protein = apoenzyme
- vitamins and derivatives are
known as prosthetic groups
- Coenzymes
- similar but not attached as tightly
- Example: NAD+ which is reduced to NADH
- Effect of pH
- can affect the stability of a protein
and the rate of catalysis
- most enzymes are active at neutral pH.
- Effect of temperature
- rate of enzyme doubles for 10 degree rise in temp.
- only a few enzymes are stable above 50 degrees.