[ccp4bb] Scattering model of crystallography (and beyond)

2014-07-27 Thread Aliakbar Jafarpour
Dear All, I have been trying to answer the following questions: 1) In the context of optical imaging, how is a protein crystallography reconstruction validated? How meaningful is this perspective of protein crystallography (optical imaging)? 2) In transition to single particles (single unit cells

Re: [ccp4bb] Heavy Atom Phasing

2014-07-27 Thread Chris Fage
Hi Rhys, Have you tried quick back-soaks into solutions lacking the heavy atoms? This can reduce radiation decay caused by absorption of X-rays by overabundant heavy atoms. Best, Chris > On Jul 27, 2014, at 4:48 PM, RHYS GRINTER > wrote: > > Hi All, > > I thought I might put a question t

Re: [ccp4bb] Heavy Atom Phasing

2014-07-27 Thread Keller, Jacob
How about merging multiple crystals together a la Wayne Hendrickson's most recent papers? JPK -Original Message- From: CCP4 bulletin board [mailto:CCP4BB@JISCMAIL.AC.UK] On Behalf Of Boaz Shaanan Sent: Sunday, July 27, 2014 6:34 PM To: CCP4BB@JISCMAIL.AC.UK Subject: Re: [ccp4bb] Heavy A

Re: [ccp4bb] Heavy Atom Phasing

2014-07-27 Thread Boaz Shaanan
Hi, While some useful phase information could perhaps be extracted from the data you currently have, I'd suggest to try the method of quick soak described here: Acta Cryst. (2002). D58, 1092-1098 rather than the long soak that you tried. I guess that you also tried complete new screens for th

[ccp4bb] Heavy Atom Phasing

2014-07-27 Thread RHYS GRINTER
Hi All, I thought I might put a question to the community, with the hope of getting some tips of the best way to proceed with my heavy atom phasing problem. I'm working on solving the structure of an integral beta-barrel membrane protein of approximately 100 kDa. I've crystallised protein, growi