KOCatalog

KEGG Orthology (KO) - All Categories

http://www.kegg.jp/kegg-bin/get_htext?ko00000.keg

In general KO grouping of functional orthologs is defined in the context of KEGG molecular networks (KEGG pathway maps, BRITE hierarchies and KEGG modules), which are in fact represented as networks of nodes identified by K numbers. The relationships between KOs and corresponding molecular networks are represented in the following KO system.

The fact that functional information is associated with ortholog groups is a unique aspect of the KEGG resource. The sequence similarity based inference as a generalization of limited amount of experimental evidence is predefined in KEGG. As implemented in BlastKOALA and other tools, the sequence similarity search against KEGG GENES is a search for most appropriate K numbers. Once K numbers are assigned to genes in the genome, the KEGG pathways maps, Brite hierarchies, and KEGG modules are automatically reconstructed, enabling biological interpretation of high-level functions.

因为一个基因会出现在若干个不同的代谢途径之中，所以某一个KO编号是会出现重复的内容定义的，但是他们的所属的代谢途径的定义却是不同的， 所以函数返回的字典为一个KO编号对应若干个KO term