View source for 6qva


==Crystal structure of a CHAD domain from Chlorobium tepidum in complex with inorganic polyphosphate==
<StructureSection load='6qva' size='340' side='right'caption='[[6qva]], [[Resolution|resolution]] 2.05&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6qva]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Chlorobaculum_tepidum_TLS Chlorobaculum tepidum TLS]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6QVA OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6QVA 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]] 2.05&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=3PO:TRIPHOSPHATE'>3PO</scene>, <scene name='pdbligand=9PI:bis[oxidanyl-[oxidanyl-[oxidanyl(phosphonooxy)phosphoryl]oxy-phosphoryl]oxy-phosphoryl]+hydrogen+phosphate'>9PI</scene>, <scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</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=6qva FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6qva OCA], [https://pdbe.org/6qva PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6qva RCSB], [https://www.ebi.ac.uk/pdbsum/6qva PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6qva ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/Q8KE09_CHLTE Q8KE09_CHLTE] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Inorganic polyphosphates (polyPs) are linear polymers of orthophosphate units linked by phosphoanhydride bonds. Here, we report that bacterial, archaeal, and eukaryotic conserved histidine alpha-helical (CHAD) domains are specific polyP-binding modules. Crystal structures reveal that CHAD domains are formed by two four-helix bundles, giving rise to a central pore surrounded by conserved basic surface patches. Different CHAD domains bind polyPs with dissociation constants ranging from the nano- to mid-micromolar range, but not nucleic acids. A CHAD-polyP complex structure reveals the phosphate polymer binding across the central pore and along the two basic patches. Mutational analysis of CHAD-polyP interface residues validates the complex structure. The presence of a CHAD domain in the polyPase ygiF enhances its enzymatic activity. The only known CHAD protein from the plant Ricinus communis localizes to the nucleus/nucleolus when expressed in Arabidopsis and tobacco, suggesting that plants may harbor polyPs in these compartments. We propose that CHAD domains may be used to engineer the properties of polyP-metabolizing enzymes and to specifically localize polyP stores in eukaryotic cells and tissues.

Molecular characterization of CHAD domains as inorganic polyphosphate-binding modules.,Lorenzo-Orts L, Hohmann U, Zhu J, Hothorn M Life Sci Alliance. 2019 May 27;2(3). pii: 2/3/e201900385. doi:, 10.26508/lsa.201900385. Print 2019 Jun. PMID:31133615<ref>PMID:31133615</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6qva" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
[[Category: Chlorobaculum tepidum TLS]]
[[Category: Large Structures]]
[[Category: Hothorn M]]
[[Category: Lorenzo-Orts L]]