View source for 3zfj


==N-terminal domain of pneumococcal PhtD protein with bound Zn(II)==
<StructureSection load='3zfj' size='340' side='right'caption='[[3zfj]]' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3zfj]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Streptococcus_pneumoniae_D39 Streptococcus pneumoniae D39]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3ZFJ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3ZFJ FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><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=3zfj FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3zfj OCA], [https://pdbe.org/3zfj PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3zfj RCSB], [https://www.ebi.ac.uk/pdbsum/3zfj PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3zfj ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/A0A0H2ZP82_STRP2 A0A0H2ZP82_STRP2] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Zinc (Zn(2+)) homeostasis is critical for pathogen host colonization and invasion. Polyhistidine triad (Pht) proteins, located at the surface of various streptococci, have been proposed to be involved in Zn(2+) homeostasis. The phtD gene, coding for a Zn(2+)-binding protein, is organized in an operon with adcAII coding for the extracellular part of a Zn(2+) transporter. In the present work, we investigate the relationship between PhtD and AdcAII using biochemical and structural biology approaches. Immuno-precipitation experiments on purified membranes of Streptococcus pneumoniae (S. pneumoniae) demonstrate that native PhtD and AdcAII interact in vivo confirming our previous in vitro observations. NMR was used to demonstrate Zn(2+) transfer from the Zn(2+)-bound form of a 137 amino acid N-terminal domain of PhtD (t-PhtD) to AdcAII. The high resolution NMR structure of t-PhtD shows that Zn(2+) is bound in a tetrahedral site by histidines 83, 86, and 88 as well as by glutamate 63. Comparison of the NMR parameters measured for apo- and Zn(2+)-t-PhtD shows that the loss of Zn(2+) leads to a diminished helical propensity at the C-terminus and increases the local dynamics and overall molecular volume. Structural comparison with the crystal structure of a 55-long fragment of PhtA suggests that Pht proteins are built from short repetitive units formed by three beta-strands containing the conserved HxxHxH motif. Taken together, these results support a role for S. pneumoniae PhtD as a Zn(2+) scavenger for later release to the surface transporter AdcAII, leading to Zn(2+) uptake.

New Insights into Histidine Triad Proteins: Solution Structure of a Streptococcus pneumoniae PhtD Domain and Zinc Transfer to AdcAII.,Bersch B, Bougault C, Roux L, Favier A, Vernet T, Durmort C PLoS One. 2013 Nov 28;8(11):e81168. doi: 10.1371/journal.pone.0081168. PMID:24312273<ref>PMID:24312273</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 3zfj" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Streptococcus pneumoniae D39]]
[[Category: Bersch B]]
[[Category: Bougault C]]
[[Category: Durmort C]]
[[Category: Favier A]]
[[Category: Gabel F]]
[[Category: Roux L]]
[[Category: Vernet T]]