1yj7
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(New page: 200px<br /><applet load="1yj7" size="450" color="white" frame="true" align="right" spinBox="true" caption="1yj7, resolution 1.8Å" /> '''Crystal structure of ...)
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Revision as of 02:03, 25 November 2007
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Crystal structure of enteropathogenic E.coli (EPEC) type III secretion system protein EscJ
Overview
Type III secretion systems (TTSSs) are multi-protein macromolecular, 'machines' that have a central function in the virulence of many, Gram-negative pathogens by directly mediating the secretion and, translocation of bacterial proteins (termed effectors) into the cytoplasm, of eukaryotic cells. Most of the 20 unique structural components, constituting this secretion apparatus are highly conserved among animal, and plant pathogens and are also evolutionarily related to proteins in the, flagellar-specific export system. Recent electron microscopy experiments, have revealed the gross 'needle-shaped' morphology of the TTSS, yet a, detailed understanding of the structural characteristics and organization, of these protein components within the bacterial membranes is lacking., Here we report the 1.8-A crystal structure of EscJ from enteropathogenic, Escherichia coli (EPEC), a member of the YscJ/PrgK family whose, oligomerization represents one of the earliest events in TTSS assembly., Crystal packing analysis and molecular modelling indicate that EscJ could, form a large 24-subunit 'ring' superstructure with extensive grooves, ridges and electrostatic features. Electron microscopy, labelling and mass, spectrometry studies on the orthologous Salmonella typhimurium PrgK within, the context of the assembled TTSS support the stoichiometry, membrane, association and surface accessibility of the modelled ring. We propose, that the YscJ/PrgK protein family functions as an essential molecular, platform for TTSS assembly.
About this Structure
1YJ7 is a Single protein structure of sequence from Escherichia coli with PO4 and GOL as ligands. Full crystallographic information is available from OCA.
Reference
Structural characterization of the molecular platform for type III secretion system assembly., Yip CK, Kimbrough TG, Felise HB, Vuckovic M, Thomas NA, Pfuetzner RA, Frey EA, Finlay BB, Miller SI, Strynadka NC, Nature. 2005 Jun 2;435(7042):702-7. PMID:15931226
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