Re: [ccp4bb] DNA-protein complex.

2010-11-15 Thread Nicolas Foos
Hi, maybe you solved your problem, if not, you can try this : You prepare your protein at high salt concentration. After that you add your ssDNA directly and you proceed by dialysis. You prepare your dialysis with a low salt concentration buffer. You can use different buffer by step in order

Re: [ccp4bb] DNA-protein complex.

2010-10-31 Thread Poul Nissen
Dear dengzq1987 (Gmail Research Institute?) You could use ammonium acetate as the solubilizing salt. It evaporates as ammonia and acetic acid, so that the ionic strength is gradually reduced by vapor diffusion. You would then have e.g. PEG in the reservoir and added to the drop, and you could a

[ccp4bb] DNA-protein complex.

2010-10-31 Thread dengzq1987
Hi all, I want to sovle the structrue of ssDNA -protein complex.but the protein are unstable at low salt concentration,so we use 1M Nacl in the buffer. the high salt content may disrupt the complex.and I don't know which ssDNA lenght try fist.any suggestion or experience are welcome. thank