View source for 6n70


==Crystal Structure of ATPase delta1-79 Spa47 R191A==
<StructureSection load='6n70' size='340' side='right'caption='[[6n70]], [[Resolution|resolution]] 2.74&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6n70]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Shigella_flexneri Shigella flexneri]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6N70 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6N70 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]] 2.738&#8491;</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=6n70 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6n70 OCA], [https://pdbe.org/6n70 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6n70 RCSB], [https://www.ebi.ac.uk/pdbsum/6n70 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6n70 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/SCTN_SHIFL SCTN_SHIFL] ATPase component of the type III secretion system (T3SS), also called injectisome, which is used to inject bacterial effector proteins into eukaryotic host cells (PubMed:26947936, PubMed:27770024, PubMed:29595954). Acts as a molecular motor to provide the energy that is required for the export of proteins (Probable). Required for type III secretion apparatus (T3SA) formation, proper protein secretion, host cell invasion and virulence (PubMed:26947936, PubMed:27770024, PubMed:31162724). May play a critical role in T3SS substrate recognition, disassembly of the effector/chaperone complex and unfolding of the effector in an ATP-dependent manner prior to secretion (By similarity).[UniProtKB:P0A1B9]<ref>PMID:26947936</ref> <ref>PMID:27770024</ref> <ref>PMID:29595954</ref> <ref>PMID:31162724</ref> <ref>PMID:26947936</ref> <ref>PMID:27770024</ref> 
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== Publication Abstract from PubMed ==
Like many Gram-negative pathogens, Shigella rely on a type three secretion system (T3SS) for injection of effector proteins directly into eukaryotic host cells to initiate and sustain infection. Protein secretion through the needle-like type three secretion apparatus (T3SA) requires ATP hydrolysis by the T3SS ATPase Spa47, making it a likely target for in vivo regulation of T3SS activity and an attractive target for small molecule therapeutics against shigellosis. Here, we developed a model of an activated Spa47 homo-hexamer, identifying two distinct regions at each protomer interface that we hypothesized to provide intermolecular interactions supporting Spa47 oligomerization and enzymatic activation. Mutational analysis and a series of high-resolution crystal structures confirm the importance of these residues, as many of the engineered mutants are unable to form oligomers and efficiently hydrolyze ATP in vitro. Furthermore, in vivo evaluation of Shigella virulence phenotype uncovered a strong correlation between T3SS effector protein secretion, host cell membrane disruption, and cellular invasion by the tested mutant strains, suggesting that perturbation of the identified interfacial residues/interactions influences Spa47 activity through preventing oligomer formation, which in turn regulates Shigella virulence. The most impactful mutations are observed within the conserved Site 2 interface where the native residues support oligomerization and likely contribute to a complex hydrogen bonding network that organizes the active site and supports catalysis. The critical reliance on these conserved residues suggests that aspects of T3SS regulation may also be conserved, providing promise for the development of a cross-species therapeutic that broadly targets T3SS ATPase oligomerization and activation.

Interfacial amino acids support Spa47 oligomerization and shigella type three secretion system activation.,Demler HJ, Case HB, Morales Y, Bernard AR, Johnson SJ, Dickenson NE Proteins. 2019 Jun 4. doi: 10.1002/prot.25754. PMID:31162724<ref>PMID:31162724</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 6n70" style="background-color:#fffaf0;"></div>

==See Also==
*[[ATPase 3D structures|ATPase 3D structures]]
== References ==
<references/>
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</StructureSection>
[[Category: Large Structures]]
[[Category: Shigella flexneri]]
[[Category: Demler HJ]]
[[Category: Dickenson NE]]
[[Category: Johnson SJ]]
[[Category: Morales Y]]
[[Category: Olsen KJ]]