[Protein] that catalysis chemical reaction. Enzymes are biological catalysts which are responsible for biochemical reactions- synthesis, metabolic degradaton, energy transfer and so on- in living organisms.

Properties of enzymes as catalysts.

1. Increase the rate of a reactin by lowering the activation energy barrier
2. Not be consumed or changed during catalyzing
3. Only change the rate of getting to equilibrium not the position of equilibrium
4. By transient combination with reactants(substrates) , stabilizing the transition state.

Enzymes are functionally categorized by EcNumber. Enzymes activate [Life] in the law of EnzymeKinetics. Activation or repression of enzyme activity are regulated in the active site or AllostericSite by other components, ligands or co-factors.

Enzyme [Database]s

• [LIGAND]
• [BRENDA]
• [ENZYME]

Special enzymes

1. Protease

2. RestrictionEnzyme