Properties of Enzymes

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

Resource summary

	Created by kathrynmoar over 10 years ago