2mme: Difference between revisions
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{{Large structure}} | |||
==Hybrid structure of the Shigella flexneri MxiH Type three secretion system needle== | ==Hybrid structure of the Shigella flexneri MxiH Type three secretion system needle== | ||
<StructureSection load='2mme' size='340' side='right' caption='[[2mme]], [[Resolution|resolution]] 7.70Å, [[NMR_Ensembles_of_Models | 10 NMR models]]' scene=''> | <StructureSection load='2mme' size='340' side='right' caption='[[2mme]], [[Resolution|resolution]] 7.70Å, [[NMR_Ensembles_of_Models | 10 NMR models]]' scene=''> | ||
== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>[[2mme]] is a 29 chain structure. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2MME OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2MME FirstGlance]. <br> | <table><tr><td colspan='2'>[[2mme]] is a 29 chain structure with sequence from [http://en.wikipedia.org/wiki/"shigella_paradysenteriae"_weldin_1927 "shigella paradysenteriae" weldin 1927]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2MME OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2MME FirstGlance]. <br> | ||
</td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2mme FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2mme OCA], [http://pdbe.org/2mme PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2mme RCSB], [http://www.ebi.ac.uk/pdbsum/2mme PDBsum]</span></td></tr> | </td></tr><tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">mxiH ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=623 "Shigella paradysenteriae" Weldin 1927])</td></tr> | ||
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2mme FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2mme OCA], [http://pdbe.org/2mme PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2mme RCSB], [http://www.ebi.ac.uk/pdbsum/2mme PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2mme ProSAT]</span></td></tr> | |||
</table> | </table> | ||
{{Large structure}} | {{Large structure}} | ||
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__TOC__ | __TOC__ | ||
</StructureSection> | </StructureSection> | ||
[[Category: Shigella paradysenteriae weldin 1927]] | |||
[[Category: Baker, D]] | [[Category: Baker, D]] | ||
[[Category: Becker, S]] | [[Category: Becker, S]] | ||
Revision as of 01:43, 10 August 2018
Hybrid structure of the Shigella flexneri MxiH Type three secretion system needleHybrid structure of the Shigella flexneri MxiH Type three secretion system needle
Structural highlights
Warning: this is a large structure, and loading might take a long time or not happen at all. Publication Abstract from PubMedType III secretion systems of Gram-negative bacteria form injection devices that deliver effector proteins into eukaryotic cells during infection. They span both bacterial membranes and the extracellular space to connect with the host cell plasma membrane. Their extracellular portion is a needle-like, hollow tube that serves as a secretion conduit for effector proteins. The needle of Shigella flexneri is approximately 50-nm long and 7-nm thick and is made by the helical assembly of one protein, MxiH. We provide a 7-A resolution 3D image reconstruction of the Shigella needle by electron cryomicroscopy, which resolves alpha-helices and a beta-hairpin that has never been observed in the crystal and solution structures of needle proteins, including MxiH. An atomic model of the needle based on the 3D-density map, in comparison with that of the bacterial-flagellar filament, provides insights into how such a thin tubular structure is stably assembled by intricate intermolecular interactions. The map also illuminates how the needle-length control protein functions as a ruler within the central channel during export of MxiH for assembly at the distal end of the needle, and how the secretion-activation signal may be transduced through a conformational change of the needle upon host-cell contact. Structure of a type III secretion needle at 7-A resolution provides insights into its assembly and signaling mechanisms.,Fujii T, Cheung M, Blanco A, Kato T, Blocker AJ, Namba K Proc Natl Acad Sci U S A. 2012 Mar 2. PMID:22388746[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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