View source for 6qss


==Crystal Structure of Ignicoccus islandicus malate dehydrogenase co-crystallized with 10 mM Tb-Xo4==
<StructureSection load='6qss' size='340' side='right'caption='[[6qss]], [[Resolution|resolution]] 1.89&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6qss]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Ignicoccus_islandicus_DSM_13165 Ignicoccus islandicus DSM 13165]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6QSS OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6QSS FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Hybrid , X-ray diffraction , X-ray solution scattering, [[Resolution|Resolution]] 1.892&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=TB:TERBIUM(III)+ION'>TB</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=6qss FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6qss OCA], [https://pdbe.org/6qss PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6qss RCSB], [https://www.ebi.ac.uk/pdbsum/6qss PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6qss ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/A0A0U3FQH7_9CREN A0A0U3FQH7_9CREN] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The NAD(P)-dependent malate dehydrogenases (MalDHs) and NAD-dependent lactate dehydrogenases (LDHs) are homologous enzymes involved in central metabolism. They display a common protein fold and the same catalytic mechanism, yet have a stringent capacity to discriminate between their respective substrates. The MalDH/LDH superfamily is divided into several phylogenetically related groups. It has been shown that the canonical LDHs and LDH-like group of MalDHs are primarily tetrameric enzymes that diverged from a common ancestor. In order to gain understanding of the evolutionary history of the LDHs and MalDHs, the biochemical properties and crystallographic structure of the LDH-like MalDH from the hyperthermophilic archaeon Ignicoccus islandicus (I. isl) were determined. I. isl MalDH recognizes oxaloacetate as main substrate, but it is also able to use pyruvate. Surprisingly, with pyruvate, the enzymatic activity profile looks like that of allosteric LDHs, suggesting a hidden allosteric capacity in a MalDH. The I. isl MalDH tetrameric structure in the apo state is considerably different from those of canonical LDH-like MalDHs and LDHs, representing an alternative oligomeric organization. A comparison with MalDH and LDH counterparts provides strong evidence that the divergence between allosteric and non-allosteric members of the superfamily involves homologs with intermediate, atypical properties.

The archaeal LDH-like malate dehydrogenase from Ignicoccus islandicus displays dual substrate recognition, hidden allostery and a non-canonical tetrameric oligomeric organization.,Roche J, Girard E, Mas C, Madern D J Struct Biol. 2019 Jul 10. pii: S1047-8477(19)30153-4. doi:, 10.1016/j.jsb.2019.07.006. PMID:31301348<ref>PMID:31301348</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6qss" style="background-color:#fffaf0;"></div>

==See Also==
*[[Malate Dehydrogenase 3D structures|Malate Dehydrogenase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Ignicoccus islandicus DSM 13165]]
[[Category: Large Structures]]
[[Category: Girard E]]
[[Category: Madern D]]
[[Category: Roche J]]