Controlled 2D crystallization of membrane proteins using methyl-beta-cyclodextrin

Signorell, G. A. and Kaufmann, T. C. and Kukulski, W. and Engel, A. and Remigy, H. -W.. (2007) Controlled 2D crystallization of membrane proteins using methyl-beta-cyclodextrin. Journal of structural biology, Vol. 157, H. 2. pp. 321-328.

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Official URL: http://edoc.unibas.ch/dok/A5262436

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High-resolution structural data of membrane proteins can be obtained by studying 2D crystals by electron crystallography. Finding the right conditions to produce these crystals is one of the major bottlenecks encountered in 2D crystallography. Many reviews address 2D crystallization techniques in attempts to provide guidelines for crystallographers. Several techniques including new approaches to remove detergent like the biobeads technique and the development of dedicated devices have been described (dialysis and dilution machines). In addition, 2D crystallization at interfaces has been studied, the most prominent method being the 2D crystallization at the lipid monolayer. A new approach based on detergent complexation by cyclodextrins is presented in this paper. To prove the ability of cyclodextrins to remove detergent from ternary mixtures (lipid, detergent and protein) in order to get 2D crystals, this method has been tested with OmpF, a typical beta-barrel protein, and with SoPIP2;1, a typical alpha-helical protein. Experiments over different time ranges were performed to analyze the kinetic effects of detergent removal with cyclodextrins on the formation of 2D crystals. The quality of the produced crystals was assessed with negative stain electron microscopy, cryo-electron microscopy and diffraction. Both proteins yielded crystals comparable in quality to previous crystallization reports.
Faculties and Departments:05 Faculty of Science > Departement Biozentrum > Former Organization Units Biozentrum > Structural Biology (Engel)
UniBasel Contributors:Engel, Andreas H
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Academic Press
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:14 Sep 2012 06:50
Deposited On:22 Mar 2012 13:24

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