View source for 5b3d


==Structure of a flagellar type III secretion chaperone, FlgN==
<StructureSection load='5b3d' size='340' side='right'caption='[[5b3d]], [[Resolution|resolution]] 2.30&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5b3d]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Salmonella_enterica_subsp._enterica_serovar_Typhimurium_str._LT2 Salmonella enterica subsp. enterica serovar Typhimurium str. LT2]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5B3D OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5B3D FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.3&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</scene></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=5b3d FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5b3d OCA], [https://pdbe.org/5b3d PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5b3d RCSB], [https://www.ebi.ac.uk/pdbsum/5b3d PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5b3d ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/FLGN_SALTY FLGN_SALTY] Required for the efficient initiation of filament assembly.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The bacterial flagellar type III export chaperones not only act as bodyguards to protect their cognate substrates from aggregation and proteolysis in the cytoplasm but also ensure the order of export through their interactions with an export gate protein FlhA. FlgN chaperone binds to FlgK and FlgL with nanomolar affinity and transfers them to FlhA for their efficient and rapid transport for the formation of the hook-filament junction zone. However, it remains unknown how FlgN releases FlgK and FlgL at the FlhA export gate platform in a timely manner. Here, we have solved the crystal structure of Salmonella FlgN at 2.3 A resolution and carried out structure-based functional analyses. FlgN consists of three alpha helices, alpha1, alpha2 and alpha3. Helix alpha1 adopts two distinct, extended and bent conformations through the conformational change of N-loop between alpha1 and alpha2. The N-loop deletion not only increases the probability of FlgN dimer formation but also abolish the interaction between FlgN and FlgK. Highly conserved Asn-92, Asn-95 and Ile-103 residues in helix alpha3 are involved in the strong interaction with FlgK. We propose that the N-loop coordinates helical rearrangements of FlgN with the association and dissociation of its cognate substrates during their export. This article is protected by copyright. All rights reserved.

Rearrangements of alpha-helical structures of FlgN chaperone control the binding affinity for its cognate substrates during flagellar type III export.,Kinoshita M, Nakanishi Y, Furukawa Y, Namba K, Imada K, Minamino T Mol Microbiol. 2016 May 13. doi: 10.1111/mmi.13415. PMID:27178222<ref>PMID:27178222</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 5b3d" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Salmonella enterica subsp. enterica serovar Typhimurium str. LT2]]
[[Category: Imada K]]
[[Category: Kinoshita M]]
[[Category: Minamino T]]
[[Category: Nakanishi Y]]
[[Category: Namba K]]