Wouldn't it make sense to do MIRAS with both the Se and Hg derivatives, and add in some multi-crystal averaging from the native set? You seem like you are almost there, though. I assume you have already tried DM and NCS averaging (if there is any)?
Jacob ******************************************* Jacob Pearson Keller Northwestern University Medical Scientist Training Program Dallos Laboratory F. Searle 1-240 2240 Campus Drive Evanston IL 60208 lab: 847.491.2438 cel: 773.608.9185 email: [EMAIL PROTECTED] ******************************************* ----- Original Message ----- From: Junyu Xiao To: [email protected] Sent: Thursday, July 17, 2008 10:13 AM Subject: [ccp4bb] Advice for phasing Hi, I have a very good native data set. However, the selenomethionyl crystal has a different space group and always suffers from radiation damage. A three-wavelength data set was still collected, and after phasing in SHARP, some features can be seen but the map is not good enough for tracing. Then I did some heavy atom soaking with the native crystals and collected data at home, however, the crystal was again converted into the same space group as the selenomethionyl crystal. At lease 4 Hg sites can be found both by isomorphous difference Fourier calculated using the partial Se-MAD phase and by isomorphous difference Patterson, suggesting they should be real. Now with these information, what's the best way to do the phasing in SHARP, or in some other programs? I hope I have made myself clear; and I would like to supply more details. Any suggestion will be highly appreciated. Best regards, Junyu ============================== Junyu Xiao Department of Biological Chemistry, University of Michigan Lab address: 3163 Life Sciences Institute University of Michigan 210 Washtenaw Avenue Ann Arbor, MI, 48109-2216 Phone: 734-615-2078 ==============================
