Sorry: forgotten the pH: the crystals grow between pH 6.5 and 6.7. Claudia
Claudia Scotti Dipartimento di Medicina Sperimentale Sezione di Patologia Generale Universita' di Pavia Piazza Botta, 10 27100 Pavia Italia Tel. 0039 0382 986335/8/1 Facs 0039 0382 303673 ---------------------------------------- > Date: Fri, 22 Jun 2007 14:15:47 +0200 > From: [EMAIL PROTECTED] > Subject: [ccp4bb] How to replace 2.45M K/Na phosphate buffer > To: CCP4BB@JISCMAIL.AC.UK > > Dear list, > > I've crystals in a condition including 2,45 M K/Na phosphate buffer for the > well condition, and 1 microl protein + 0.8 microl Na/K phosphate buffer + > 0.25 microl 30% 1,6-hexanediol in the drop condition. > > These crystals dissolve in several cryoprotectant solutions and survive only > in malonic acid, with which they give diffraction at 7-8 A. > > Among the several different possibilities, I'd like to try to optimize the > crystals, and one possiblity among others would be to change the buffer. > > Any suggestions, please, about how to replace K/Na phosphate? At these > concentrations it is acting as a buffer but also as a precipitant and I was > wondering if anybody has experienced nice buffer-salt combinations that > proved to be useful starting from a similar condition. > > Thanks a lot, > > Claudia > > > > > > > > > > > > > > > > Claudia Scotti > Dipartimento di Medicina Sperimentale > Sezione di Patologia Generale > Universita' di Pavia > Piazza Botta, 10 > 27100 Pavia > Italia > Tel. 0039 0382 986335/8/1 > Facs 0039 0382 303673 > _________________________________________________________________ > Make every IM count. Download Windows Live Messenger and join the i’m > Initiative now. It’s free. > http://im.live.com/messenger/im/home/?source=TAGWL_June07 _________________________________________________________________ Make every IM count. Download Windows Live Messenger and join the i’m Initiative now. It’s free. http://im.live.com/messenger/im/home/?source=TAGWL_June07
