http://www.genome.jp/kegg/brite.html: KEGG BRITE hierarchy files.  

KEGG files for different organism can be downloaded from http://www.genome.jp/kegg-bin/get_htext?htext=br08601_ko00001&query=ko&option=-w
e.g. NCTC8325: http://www.genome.jp/kegg-bin/get_htext?sao00001

The file format is described here: http://www.genome.jp/kegg/kegg3b.html
