View source for 4ayh


==The X-ray structure of zinc bound ZinT==
<StructureSection load='4ayh' size='340' side='right'caption='[[4ayh]], [[Resolution|resolution]] 2.52&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4ayh]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Salmonella_enterica Salmonella enterica]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4AYH OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4AYH 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]] 2.52&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</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=4ayh FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4ayh OCA], [https://pdbe.org/4ayh PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4ayh RCSB], [https://www.ebi.ac.uk/pdbsum/4ayh PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4ayh ProSAT]</span></td></tr>
</table>
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== Publication Abstract from PubMed ==
BACKGROUND: In Gram-negative bacteria the ZnuABC transporter ensures adequate zinc import in Zn(II)-poor environments, like those encountered by pathogens within the infected host. Recently, the metal-binding protein ZinT was suggested to operate as an accessory component of ZnuABC in periplasmic zinc recruitment. Since ZinT is known to form a ZinT-ZnuA complex in the presence of Zn(II) it was proposed to transfer Zn(II) to ZnuA. The present work was undertaken to test this claim. METHODS: ZinT and its structural relationship with ZnuA have been characterized by multiple biophysical techniques (X-ray crystallography, SAXS, analytical ultracentrifugation, fluorescence spectroscopy). RESULTS: The metal-free and metal-bound crystal structures of Salmonella enterica ZinT show one Zn(II) binding site and limited structural changes upon metal removal. Spectroscopic titrations with Zn(II) yield a KD value of 22+/-2nM for ZinT, while those with ZnuA point to one high affinity (KD&lt;20nM) and one low affinity Zn(II) binding site (KD in the micromolar range). Sedimentation velocity experiments established that Zn(II)-bound ZinT interacts with ZnuA, whereas apo-ZinT does not. The model of the ZinT-ZnuA complex derived from small angle X-ray scattering experiments points to a disposition that favors metal transfer as the metal binding cavities of the two proteins face each other. CONCLUSIONS: ZinT acts as a Zn(II)-buffering protein that delivers Zn(II) to ZnuA. GENERAL SIGNIFICANCE: Knowledge of the ZinT-ZnuA relationship is crucial for understanding bacterial Zn(II) uptake.

The Salmonella enterica ZinT structure, zinc affinity and interaction with the high-affinity uptake protein ZnuA provide insight into the management of periplasmic zinc.,Ilari A, Alaleona F, Tria G, Petrarca P, Battistoni A, Zamparelli C, Verzili D, Falconi M, Chiancone E Biochim Biophys Acta. 2014 Jan;1840(1):535-44. doi: 10.1016/j.bbagen.2013.10.010., Epub 2013 Oct 12. PMID:24128931<ref>PMID:24128931</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Salmonella enterica]]
[[Category: Alaleona F]]
[[Category: Battistoni A]]
[[Category: Chiancone E]]
[[Category: Ilari A]]
[[Category: Petrarca P]]