Re: [ccp4bb] Protein behaves as dimers in 2M NaCl and as high oligomers with 300mM NaCl

2014-02-27 Thread Wenhe
Hi Tom, Currently I am also working a protein which likes to be soluble aggregates. I am surprised to known that you manage to disrupt the aggregate to dimmer. So far I have made many truncations however without any success so far. I might try high salts and several detergents later. Does your

Re: [ccp4bb] Protein behaves as dimers in 2M NaCl and as high oligomers with 300mM NaCl

2014-02-27 Thread David Briggs
Hi Tom, Are your protein or related proteins known to dimerise? Is the dimer perhaps the natural state, and are the high oligomers non-specific aggregation? That would be my first guess, knowing nothing about the protein you are working on. If you are absolutely certain that the protein should

[ccp4bb] Protein behaves as dimers in 2M NaCl and as high oligomers with 300mM NaCl

2014-02-26 Thread Tom Wong
Hello everyone! I have run into a problem in a 55kD recombinant human protein crystallization (expressed in E.Coil). The purity is pretty good. However, it behaves as high oligomers in the buffer with 300mM NaCl and behaves as dimers with a little high oligomers in the buffer with 2000mM (2M)