SubtiPathways is a model of B. subtilis metabolism and regulation in SBML/SBGN (Systems Biology Markup Language/ Graphical Notation). There is a color code for key metabolites (see the legend on the right side).
It can be used like Google Maps (scroll and zoom to the pathways). The markers of proteins and compounds listed on the right side in each pathway are containing links to the corresponding SubtiWiki and PubChem pages, respectively. There is a short description for each protein in the bubbles, too.
Nitrogen and amino acid metabolism