A protocol has been worked out in our lab in the
late eighties,
where crystals grown in high ammoniumsulphate
concentration
2.4 M) were transferred to various other
precipitant solutions
with the same water activity to keep them stable.
After
transferring to PEG 6000 the crystals could be
used successfully
for soaking studies, because the sulphate ion
previously bound
in the active site was now absent.
See :
Appl. Cryst. (1988). 21,
426-429 [DOI 10.1107/S0021889888004108]
The transfer of protein crystals from their original mother liquor to a solution with a completely different precipitant
H. A. Schreuder, H. Groendijk, J. M. van der Laan and R. K. Wierenga
Good luck,
 |
Ing. Tjaard Pijning |
Protein Crystallography Group Department of Chemistry University of Groningen Nijenborgh 4, 9747AG Groningen The Netherlands (31)(0)50 363 4385 | t.pijning@chem.rug.nl | http://www.xray.chem.rug.nl/tjaard |