HumanCyc

http://humancyc.org/

Encyclopedia of Homo sapiens Genes and Metabolism
(be sure to change database to search at the bottom of the search menu!)

Here is a snippet from the website:

"HumanCyc is a bioinformatics database that describes the human metabolic pathways and the human genome. By presenting metabolic pathways as an organizing framework for the human genome, HumanCyc provides the user with an extended dimension for functional analysis of Homo sapiens at the genomic level. The current version of HumanCyc was constructed using Build 31 of the human genome, as detailed below. "