[ccp4bb] 回复: [ccp4bb] asking for a reference for cacodylate decomposition in protein crystals upon X-ray exposure

2012-08-03 Thread 苏晓东
king for a reference for cacodylate decomposition in protein crystals upon X-ray exposure Hi! I heard a couple of times that use of cacodylate buffers in crystallization is bad, and not only because of the compound toxicity. As I understood, presence of the cacodylate in a protein crystal wil

Re: [ccp4bb] asking for a reference for cacodylate decomposition in protein crystals upon X-ray exposure

2012-08-02 Thread Frank von Delft
Hi Tanya - did you read the next message in the thread you posted? It answers the question, even if somewhat succinctly: http://www.proteincrystallography.org/ccp4bb/message23692.html The April 2011 issue of Journal of Synchrotron Radiation has the proceedings from the 2010 Radiation Damage wo

Re: [ccp4bb] asking for a reference for cacodylate decomposition in protein crystals upon X-ray exposure

2012-08-02 Thread David Schuller
I do not have the reference you are seeking, but I have seen cacodylate-containing xtals diffract to better than 1.2 and hold up very well. Also, arsenic has an anomalous signal which may be exploited for phasing, peak ~ 1.04 A. On 07/29/12 18:53, Tatyana Sysoeva wrote: Hi! I heard a couple

Re: [ccp4bb] asking for a reference for cacodylate decomposition in protein crystals upon X-ray exposure

2012-07-30 Thread Sergei Strelkov
Dear Tatyana, We once had a project where the crystallization condition contained cacodylate. The crystals diffracted to 1.9A and survived reasonably well under the beam (maybe there was indeed some colour change upon exposure, I do not remember exactly). We were working with drug soaks. The ori

Re: [ccp4bb] asking for a reference for cacodylate decomposition in protein crystals upon X-ray exposure

2012-07-30 Thread Karsten Niefind
Am 29 Jul 2012 um 18:53 hat Tatyana Sysoeva geschrieben: > > Hi! > > I heard a couple of times that use of cacodylate buffers in crystallization > is bad, and not only > because of the compound toxicity. > > As I understood, presence of the cacodylate in a protein crystal will cause a > part

[ccp4bb] asking for a reference for cacodylate decomposition in protein crystals upon X-ray exposure

2012-07-29 Thread Tatyana Sysoeva
Hi! I heard a couple of times that use of cacodylate buffers in crystallization is bad, and not only because of the compound toxicity. As I understood, presence of the cacodylate in a protein crystal will cause a particular crystal degradation pattern upon X-ray exposure - "darkening of the cryst