Re: [ccp4bb] cryo conditions

2012-10-17 Thread Edward A. Berry
Thanks to all for the suggestions! We will try, this weekend at macCHESS, all those conditions for which we have reagents, and order the others now. > On Oct 16, 2012, at 9:01 PM, "Edward A. Berry" wrote: > >> Would someone suggest a cryoprotectant for index screen #59? It contains >> 0.02 M MgC

Re: [ccp4bb] cryo conditions

2012-10-17 Thread Enrico Stura
Dear Ed, Glycerol is a solubilizing agent. Unless something is done to conteract such effect the crystals will dissolve. Laura Vera from my lab made a presentation at ICCBM-14 on this subject. We have developed a set of balanced solutions, mixed solubilizers like glycerol and ethylene glyc

Re: [ccp4bb] cryo conditions

2012-10-16 Thread Ulrike Demmer
Dear Ed, try ca. 30 % PEG 400 Another possibility could be Perfluoropolyether Cryo Oil from Hampton Research. This liquid doesn't mix with water. You put the crystal in few microliter and remove the excess water droplets from your screen solution (otherwise you will get ice rings). Cheers, Ul

[ccp4bb] cryo conditions

2012-10-16 Thread Edward A. Berry
Would someone suggest a cryoprotectant for index screen #59? It contains 0.02 M MgCl2 0.1 M HEPES pH 7.5 22% polyacrylic acid 5100, Na salt Adding glycerol tends to dissolve the crystals. Thanks, Ed