Overall structure of luffaculin 1 in stereo representation. The two domains at the N- and C-terminal were colored in cyan and violet, respectively. Stick representations are residues Tyr70, Tyr110, Glu159 and Arg162 in the active site, and the two N-acetylglucosamines that are each covalently linked to Asn 77 and 84, respectively. All figures except for Fig. 4 were prepared using Pymol .