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Solubility diagram of the Rhodobacter sphaeroides reaction center as a function of PEG concentration
J F Gaucher1, M Riès-Kautt, F Reiss-Husson
1Laboratoire d'Enzymologie et de Biochimie Structurales, CNRS, Gif-sur-Yvette, France.
Abstract:
In order to quantify the effect of polyethylene glycol 4000 (PEG) on the solubility of an integral membrane protein, we have crystallized the photochemical reaction center from Rhodobacter sphaeroides Y by batch method on a large range of PEG. The measurement of the solubility diagram display a semi-logarithmic dependence of solubility versus PEG concentration. Comparison of our results with previously published ones [Odahara, T., Ataka, M. and Katsura, M. (1994) Acta Cryst. D50, 639-642] suggests a notable effect of additional 1,2,3-heptane-triol and/or temperature on photochemical reaction center solubility.