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Projection maps of three members of the KdgM outer membrane protein family

Signorell, G. A. and Chami, M. and Condemine, G. and Schenk, A. D. and Philippsen, A. and Engel, A. and Remigy, H. W.. (2007) Projection maps of three members of the KdgM outer membrane protein family. Journal of structural biology, Vol. 160, H. 3. pp. 395-403.

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Official URL: http://edoc.unibas.ch/dok/A5262435

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Abstract

We present the projection structures of the three outer membrane porins KdgM and KdgN from Erwinia chrysanthemi and NanC from Escherichia coli, based on 2D electron crystallography. A wide screening of 2D crystallization conditions yielded tubular crystals of a suitable size and quality to perform high-resolution electron microscopy. Data processing of untilted samples allowed us to separate the information of the two crystalline layers and resulted in projection maps to a resolution of up to 7A. All three proteins exhibit a similar putative beta-barrel structure and the three crystal forms have the same symmetry. However, there are differences in the packing arrangements of the monomers as well as the densities of the projections. To interpret these projections, secondary structure prediction was performed using beta-barrel specific prediction algorithms. The predicted transmembrane beta-barrels have a high similarity in the arrangement of the putative beta-strands and the loops, but do not match those of OmpG, a related protein porin whose structure was solved.
Faculties and Departments:05 Faculty of Science > Departement Biozentrum > Former Organization Units Biozentrum > Structural Biology (Engel)
UniBasel Contributors:Engel, Andreas H and Chami, Mohamed
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:Academic Press
ISSN:1047-8477
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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