Crystallography Research Today is a free monthly online journal that collates and summarizes the latest research about Crystallography, including details on x-ray crystals, techniques, analyses, structures.

Electron crystallography of membrane proteins: two-dimensional crystallization and screening by electron microscopy.

Schmidt-Krey I

Georgia Institute of Technology, School of Biology, 310 Ferst Drive, Atlanta, GA 30332-0230, USA. Ingeborg.Krey@biology.gatech.edu

Structural and functional information of membrane proteins at ever-increasing resolution is being obtained by electron crystallography. While a large amount of work on the development of methods for electron microscopy and image processing has resulted in tremendous advances in terms of speed of data collection and resolution, general guidelines for crystallization are first starting to emerge. Yet two-dimensional crystallization itself will always remain the limiting factor of this powerful approach in structural biology. Two-dimensional crystallization through detergent removal by dialysis is the most widely used technique. Four main factors need to be considered for the dialysis method: the protein preparation, the detergent, the lipid added as well as any constituent lipid, and the buffer conditions. Equally important is proper and careful screening to identify two-dimensional crystals.

Published 19 March 2007 in Methods, 41(4): 417-26.
Full-text of this article is available online (may require subscription).

© 2005-2008 Crystallography Research Today. All Rights Reserved.