Re: [ccp4bb] "Quick soak" method

2007-09-26 Thread Dirk Kostrewa
Hi, similarly, 30 sec soak with 0.5 M potassium iodide. But in this case, the iodides bound specifically to a site where otherwise chloride binds. These halide binding sites were totally unexpected ... Best regards, Dirk. Am 26.09.2007 um 01:55 schrieb James Whisstock: Hi - sorry - rath

Re: [ccp4bb] "Quick soak" method

2007-09-26 Thread Uwe Mueller
Dear Derek and Tassos, I normally start using the following compounds depending on pH of the cryo-solution at 10 mM concentration and 10 min incubation time and optimize towards lower concentrations and longer incubation times: -ethyl mercuric phosphate (EMP) -HgCl2 -SmCl3 -K2PtCl4 -K2PtCl6 Be

Re: [ccp4bb] "Quick soak" method

2007-09-25 Thread Jacob Keller
I also solved a structure on our home CuKa source by SIRAS with 20-60sec in 0.5-1M KI. JPK ==Original message text=== On Tue, 25 Sep 2007 6:55:28 pm CDT James Whisstock wrote: Hi - sorry - rather than iodine I meant to say we had had success with Potassium Iodide (1M f

Re: [ccp4bb] "Quick soak" method

2007-09-25 Thread James Whisstock
Hi - sorry - rather than iodine I meant to say we had had success with Potassium Iodide (1M for 20 seconds)! Cheers James [EMAIL PROTECTED] wrote:> > Hi, > > I do not use their method as such - however, I love heavy atom soaks and > do them any time I can, so I've got very similar experience

Re: [ccp4bb] "Quick soak" method

2007-09-25 Thread artem
Hi, I do not use their method as such - however, I love heavy atom soaks and do them any time I can, so I've got very similar experiences in the past. Heavy atoms can bind very quickly even from quite dilute solutions - the quickest I've ever soaked (and got useful data) was sodium chloroplatinat

Re: [ccp4bb] "Quick soak" method

2007-09-25 Thread James Whisstock
Hi Derek We have had success with iodine - 20 seconds soak. J Derek Logan <[EMAIL PROTECTED]> wrote:> > Hi Uwe, > > Just what I wanted to hear, and with a limited set of compounds too! > Follow-up question: what are these 4-6 most successful compounds? > Thanks also for the tips on monitoring

Re: [ccp4bb] "Quick soak" method

2007-09-25 Thread Juergen Bosch
There's a nice databank out there in the world wild web: http://www.sbg.bio.ic.ac.uk/had/ Juergen Derek Logan wrote: Hi Uwe, Just what I wanted to hear, and with a limited set of compounds too! Follow-up question: what are these 4-6 most successful compounds? Thanks also for the tips on

Re: [ccp4bb] "Quick soak" method

2007-09-25 Thread Das, Debanu
er 25, 2007 12:13 AM To: CCP4BB@JISCMAIL.AC.UK Subject: [ccp4bb] "Quick soak" method Hi, I'd like to find out how successful the "quick soak" method for heavy atom derivatisation proposed by Radaev and Sun: Sun PD, Radaev S, Kattah M. Generating isomorphous heavy-ato

Re: [ccp4bb] "Quick soak" method

2007-09-25 Thread Derek Logan
Hi Uwe, Just what I wanted to hear, and with a limited set of compounds too! Follow-up question: what are these 4-6 most successful compounds? Thanks also for the tips on monitoring thw soaking Derek On Sep 25, 2007, at 13:23, Uwe Mueller wrote: Dear Derek, we are using the quick-soak me

Re: [ccp4bb] "Quick soak" method

2007-09-25 Thread Alessandro S. Nascimento
You may also wish to take a look in Dauter and Nagem's quick cryo soaking for introducing anomalous scattering. 1. Acta Crystallogr D Biol Crystallogr. 2001 Jul;57(Pt 7):996-1002. 2. Methods Enzymol. 2003;374:120-37. 3. Acta Crystallogr D Biol Crystallogr. 2005 Aug;61(Pt 8):1022-30 HTH [ ]s -

Re: [ccp4bb] "Quick soak" method

2007-09-25 Thread Uwe Mueller
Dear Derek, we are using the quick-soak method frequently at the BESSY-MX beamlines. So far we were able to obtain phase information in terms of MAD/SAD- phases in all cases which we tried. The starting set-up is the screen over the 4-6 most successful heavy atom compounds at 5-10mM concentrat

[ccp4bb] "Quick soak" method

2007-09-25 Thread Derek Logan
Hi, I'd like to find out how successful the "quick soak" method for heavy atom derivatisation proposed by Radaev and Sun: Sun PD, Radaev S, Kattah M. Generating isomorphous heavy-atom derivatives by a quick-soak method. Part I: test cases. Acta Cryst. 2002. D58:1092-1098. has been in co