Furin

FES Upstream Region (FUR) Protein is a protease enzyme. It has a target sequence of Arg-X-K(Arg/Lys)-Arg¹.

1.

Hallenberger, S. et al. Inhibition of Furin-Mediated Cleavage Activation of HIV-1 Glycoprotein Gp160. Nature 360, 358–361 (1992).