View source for 6bde


==Crystal structure of Fe(II) unliganded H-NOX protein mutant A71G from K. algicida==
<StructureSection load='6bde' size='340' side='right'caption='[[6bde]], [[Resolution|resolution]] 1.64&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6bde]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Kordia_algicida_OT-1 Kordia algicida OT-1]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6BDE OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6BDE 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]] 1.641&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</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=6bde FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6bde OCA], [https://pdbe.org/6bde PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6bde RCSB], [https://www.ebi.ac.uk/pdbsum/6bde PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6bde ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/A9DSJ8_9FLAO A9DSJ8_9FLAO] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Heme nitric oxide/oxygen sensing (H-NOX) domains are direct NO sensors that regulate a variety of biological functions in both bacteria and eukaryotes. Previous work on H-NOX proteins has shown that upon NO binding, a conformational change occurs along two glycine residues on adjacent helices (termed the glycine hinge). Despite the apparent importance of the glycine hinge, it is not fully conserved in all H-NOX domains. Several H-NOX sensors from the family Flavobacteriaceae contain a native alanine substitution in one of the hinge residues. In this work, the effect of the increased steric bulk within the Ala-Gly hinge on H-NOX function was investigated. The hinge in Kordia algicida OT-1 ( Ka H-NOX) is composed of A71 and G145. Ligand-binding properties and signaling function for this H-NOX were characterized. The variant A71G was designed to convert the hinge region of Ka H-NOX to the typical Gly-Gly motif. In activity assays with its cognate histidine kinase (HnoK), the wild type displayed increased signal specificity compared to A71G. Increasing titrations of unliganded A71G gradually inhibits HnoK autophosphorylation, while increasing titrations of unliganded wild type H-NOX does not inhibit HnoK. Crystal structures of both wild type and A71G Ka H-NOX were solved to 1.9 and 1.6 A, respectively. Regions of H-NOX domains previously identified as involved in protein-protein interactions with HnoK display significantly higher b-factors in A71G compared to wild-type H-NOX. Both biochemical and structural data indicate that the hinge region controls overall conformational flexibility of the H-NOX, affecting NO complex formation and regulation of its HnoK.

Native Alanine Substitution in the Glycine Hinge Modulates Conformational Flexibility of Heme Nitric Oxide/Oxygen (H-NOX) Sensing Proteins.,Hespen CW, Bruegger JJ, Guo Y, Marletta MA ACS Chem Biol. 2018 May 29. doi: 10.1021/acschembio.8b00248. PMID:29757599<ref>PMID:29757599</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 6bde" style="background-color:#fffaf0;"></div>

==See Also==
*[[Aldolase 3D structures|Aldolase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Kordia algicida OT-1]]
[[Category: Large Structures]]
[[Category: Bruegger JJ]]
[[Category: Hespen CW]]
[[Category: Marletta MA]]