View source for 7sng


==structure of G6PD-WT tetramer==
<StructureSection load='7sng' size='340' side='right'caption='[[7sng]], [[Resolution|resolution]] 2.80&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[7sng]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7SNG OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7SNG FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 2.8&#8491;</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=7sng FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7sng OCA], [https://pdbe.org/7sng PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7sng RCSB], [https://www.ebi.ac.uk/pdbsum/7sng PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7sng ProSAT]</span></td></tr>
</table>
== Disease ==
[https://www.uniprot.org/uniprot/G6PD_HUMAN G6PD_HUMAN] Defects in G6PD are the cause of chronic non-spherocytic hemolytic anemia (CNSHA) [MIM:[https://omim.org/entry/305900 305900]. Deficiency of G6PD is associated with hemolytic anemia in two different situations. First, in areas in which malaria has been endemic, G6PD-deficiency alleles have reached high frequencies (1% to 50%) and deficient individuals, though essentially asymptomatic in the steady state, have a high risk of acute hemolytic attacks. Secondly, sporadic cases of G6PD deficiency occur at a very low frequencies, and they usually present a more severe phenotype. Several types of CNSHA are recognized. Class-I variants are associated with severe NSHA; class-II have an activity <10% of normal; class-III have an activity of 10% to 60% of normal; class-IV have near normal activity.<ref>PMID:1611091</ref> 
== Function ==
[https://www.uniprot.org/uniprot/G6PD_HUMAN G6PD_HUMAN] Produces pentose sugars for nucleic acid synthesis and main producer of NADPH reducing power.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Human glucose-6-phosphate dehydrogenase (G6PD) is the main cellular source of NADPH, and thus plays a key role in maintaining reduced glutathione to protect cells from oxidative stress disorders such as hemolytic anemia. G6PD is a multimeric enzyme that uses the cofactors beta-D-glucose 6-phosphate (G6P) and "catalytic" NADP(+) (NADP(+)c), as well as a "structural" NADP(+) (NADP(+)s) located approximately 25 A from the active site, to generate NADPH. While X-ray crystallographic and biochemical studies have revealed a role for NADP(+)s in maintaining the catalytic activity by stabilizing the multimeric G6PD conformation, other potential roles for NADP(+)s have not been evaluated. Here, we determined the high resolution cryo-electron microscopy structures of human wild-type G6PD in the absence of bound ligands and a catalytic G6PD-D200N mutant bound to NADP(+)c and NADP(+)s in the absence or presence of G6P. A comparison of these structures, together with previously reported structures, reveals that the unliganded human G6PD forms a mixture of dimers and tetramers with similar overall folds, and binding of NADP(+)s induces a structural ordering of a C-terminal extension region and allosterically regulates G6P binding and catalysis. These studies have implications for understanding G6PD deficiencies and for therapy of G6PD-mediated disorders.

Allosteric role of a structural NADP(+) molecule in glucose-6-phosphate dehydrogenase activity.,Wei X, Kixmoeller K, Baltrusaitis E, Yang X, Marmorstein R Proc Natl Acad Sci U S A. 2022 Jul 19;119(29):e2119695119. doi: , 10.1073/pnas.2119695119. Epub 2022 Jul 12. PMID:35858355<ref>PMID:35858355</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 7sng" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Marmorstein R]]
[[Category: Wei X]]