What is "fructose-asparagine"

Fructose-asparagine is a glycosylamine compound that is used during Salmonella-mediated inflammation of the intestine. The name of the genetic locus that encodes the uptake capability in Salmonella is fra. This fra locus has five genes: fraR (a regulator), fraB a fructose-asparagine deglycase, fraD a sugar kinase, fraA a fructose-asparagine transporter, and fraE a L-asparaginase.