NanC crystal structure, a model for outer-membrane channels of the acidic sugar-specific KdgM porin family

Wirth, Christophe and Condemine, Guy and Boiteux, Céline and Bernèche, Simon and Schirmer, Tilman and Peneff, Caroline M.. (2009) NanC crystal structure, a model for outer-membrane channels of the acidic sugar-specific KdgM porin family. Journal of molecular biology, Vol. 394, H. 4. pp. 718-731.

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Official URL: http://edoc.unibas.ch/dok/A5258227

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Sialic acids are acidic sugars present mostly on vertebrate cell surfaces, which can be metabolized by bacteria and act as an inflammation signal. N-Acetylneuraminic acid, the most abundant sialic acid, can enter into Escherichia coli K12 through NanC, an N-acetylneuraminic acid-inducible outer-membrane channel. With its 215 residues, NanC belongs to the family of small monomeric KdgM-related porins. KdgM homologues are found in gammaproteobacteria, including major plant and human pathogens, and together they define a large family of putative acidic sugar/oligosaccharide transporters, which are as yet poorly characterized. Here, we present the first high-resolution structure of a KdgM family member. NanC folds into a 28-A-high, 12-stranded beta-barrel, resembling the beta-domain of autotransporter NalP and defining an open pore with an average radius of 3.3 A. The channel is lined by two strings of basic residues facing each other across the pore, a feature that appears largely conserved within the KdgM family and is likely to facilitate the diffusion of acidic oligosaccharides.
Faculties and Departments:05 Faculty of Science > Departement Biozentrum > Structural Biology & Biophysics > Structural Biology (Schirmer)
UniBasel Contributors:Schirmer, Tilman and Bernèche, Simon
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article
Last Modified:07 Aug 2015 12:05
Deposited On:22 Mar 2012 13:20

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