Database

URL

Feature

KEGG

http://www.genome.jp/kegg/

Protein structure repository that provides tools for analyzing these structures

BioCyc

http://www.biocyc.org/ 

Classification of protein 3D structures in a hierarchical scheme of structural classes

BRENDA

http://www.brenda-enzymes.org/

Hierarchical classification of protein domain structure

EMP

http://emp.mcs.anl.gov/

Database of Enzymes and Metabolic pathways public server

BRITE

http://www.genome.jp/kegg/brite.html

Biomolecular Relations in Information, Transmission and Expression