[ccp4bb] SUMO(ULP-1) protease

[Gloria Borgstahl]

My fellow crystallographers,
We are thinking the SUMO/His vectors would be nice to have in the lab
aresenal... but.  The stumbling block is that the protease needed for
cleavage is very expensive at crystallography scale.  SUMO(ULP-1)
protease costs ~$700/mg fusion protein.   It would not be a problem
for labs using micrograms of protein, but is prohibitive at our level
of protein purification.
Has anyone found a way around this?  Your pal, Gloria