1.- Oxidoreductases
2.- Transferases
3.- Hydrolases
4.- Lyases
5.- Isomerases
6.- Ligases
Unclassified Enzymes

Binding
Folding Proteins
Immunological Proteins
Mobility/Motility
Other
Toxins/Viral Proteins
Transcription/Translation
Transport
Cell Cycle
Signal Hormone
Structural