View source for 4xb1


==Hyperthermophilic archaeal homoserine dehydrogenase in complex with NADPH==
<StructureSection load='4xb1' size='340' side='right'caption='[[4xb1]], [[Resolution|resolution]] 2.30&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4xb1]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Pyrococcus_horikoshii_OT3 Pyrococcus horikoshii OT3]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4XB1 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4XB1 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]] 2.3&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MPD:(4S)-2-METHYL-2,4-PENTANEDIOL'>MPD</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=NDP:NADPH+DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE+PHOSPHATE'>NDP</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=4xb1 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4xb1 OCA], [https://pdbe.org/4xb1 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4xb1 RCSB], [https://www.ebi.ac.uk/pdbsum/4xb1 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4xb1 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/O58802_PYRHO O58802_PYRHO] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
NAD(P)-dependent dehydrogenases differ according to their coenzyme preference: some prefer NAD, others NADP, and still others exhibit dual cofactor specificity. The structure of a newly identified archaeal homoserine dehydrogenase showed this enzyme to have a strong preference for NADP. However, NADP did not act as a cofactor with this enzyme, but as a strong inhibitor of NAD-dependent homoserine oxidation. Structural analysis and site-directed mutagenesis showed that the large number of interactions between the cofactor and the enzyme are responsible for the lack of reactivity of the enzyme towards NADP. This observation suggests this enzyme exhibits a new variation on cofactor binding to a dehydrogenase: very strong NADP binding that acts as an obstacle to NAD(P)-dependent dehydrogenase catalytic activity.

Crystal Structures of a Hyperthermophilic Archaeal Homoserine Dehydrogenase Suggest a Novel Cofactor Binding Mode for Oxidoreductases.,Hayashi J, Inoue S, Kim K, Yoneda K, Kawarabayasi Y, Ohshima T, Sakuraba H Sci Rep. 2015 Jul 8;5:11674. doi: 10.1038/srep11674. PMID:26154028<ref>PMID:26154028</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4xb1" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Pyrococcus horikoshii OT3]]
[[Category: Inoue S]]
[[Category: Ohshima T]]
[[Category: Sakuraba H]]
[[Category: Yoneda K]]