Isoprenoid-chained lipid EROCOC 17+4 : a new matrix for membrane protein crystallization and a crystal delivery medium in serial femtosecond crystallography.Ihara, K., Hato, M., Nakane, T., Yamashita, K., Kimura-Someya, T., Hosaka, T., Ishizuka-Katsura, Y., Tanaka, R., Tanaka, T., Sugahara, M., Hirata, K., Yamamoto, M., Nureki, O., Tono, K., Nango, E., Iwata, S., Shirouzu, M.
(2020) Sci Rep 10: 19305-19305
- PubMed: 33168855
- DOI: 10.1038/s41598-020-76277-x
- Primary Citation of Related Structures:
6LPK, 6LPJ, 6LPL
- PubMed Abstract:
In meso crystallization of membrane proteins relies on the use of lipids capable of forming a lipidic cubic phase (LCP). However, almost all previous crystallization trials have used monoacylglycerols, with 1-(cis-9-octadecanoyl)-rac-glycerol (MO) being the most widely used lipid ...
In meso crystallization of membrane proteins relies on the use of lipids capable of forming a lipidic cubic phase (LCP). However, almost all previous crystallization trials have used monoacylglycerols, with 1-(cis-9-octadecanoyl)-rac-glycerol (MO) being the most widely used lipid. We now report that EROCOC 17+4 mixed with 10% (w/w) cholesterol (Fig. 1) serves as a new matrix for crystallization and a crystal delivery medium in the serial femtosecond crystallography of Adenosine A 2A receptor (A 2A R). The structures of EROCOC 17+4 -matrix grown A 2A R crystals were determined at 2.0 Å resolution by serial synchrotron rotation crystallography at a cryogenic temperature, and at 1.8 Å by LCP-serial femtosecond crystallography, using an X-ray free-electron laser at 4 and 20 °C sample temperatures, and are comparable to the structure of the MO-matrix grown A 2A R crystal (PDB ID: 4EIY). Moreover, X-ray scattering measurements indicated that the EROCOC 17+4 /water system did not form the crystalline L C phase at least down to - 20 °C, in marked contrast to the equilibrium MO/water system, which transforms into the crystalline L C phase below about 17 °C. As the L C phase formation within the LCP-matrix causes difficulties in protein crystallography experiments in meso, this feature of EROCOC 17+4 will expand the utility of the in meso method.
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