Re: [ccp4bb] precipitation of protein in elution buffer

2010-04-21 Thread Kornelius Zeth
Hi Peter, we had a four similar cases recently. What really helped us was to add urea in amounts of 1-2 M. We tested the possible influence on secondary structure by limited proteolysis and CD/Trp-fluorescence and it seemed the protein maintained the same overall conformation as in the absence

[ccp4bb] precipitation of protein in elution buffer

2010-04-21 Thread peter hudson
Hello all I apolozize for a off topic question on BB. I am working with small proetin-protein complex, each have molecular weight 10kDa. I elute this N-terminal His-tagged complex through Ni-NTA resin in 50mM of NaH2Po4, 0.3M of NaCl, 5% glycerol and 250mM of Imidazole.Similarly, Lysis buffer and