I've had good success transferring crystals grown in

200 mM NaOAc pH 5.5 / 10% PEG 

Into a solution for room temperature diffraction (in ~6 steps, peg first, then 
buffers) :

100 mM NaOAc / 100 mM Malonate / 30% PEG

And from there into a cryo solution in 4-5 steps) that was:

100 mM NaOAc / 100 mM Malonate / 30% PEG / 20% Ethylene Glycol


Crystals have been solved to at least 1.4A resolution with mosaicity in the 
0.2-0.3 range. 

-Alex




On Aug 23, 2013, at 10:52 AM, Uday Kumar <u.ku...@fz-juelich.de> wrote:

> Hello
> 
> Can anyone suggest a cryoprotectant for the following crystallization 
> condition
> 
> 0.2-0.4M sodium formate
> 
> ~20% PEG 3350
> 
> 0-25 mM Nickel
> 
> 0-100 mM Malonate
> 
> Thank you
> 
> with regards
> uday

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