View source for 6kbl


==Structure-function study of AKR4C14, an aldo-keto reductase from Thai Jasmine rice (Oryza sativa L. ssp. Indica cv. KDML105)==
<StructureSection load='6kbl' size='340' side='right'caption='[[6kbl]], [[Resolution|resolution]] 1.70&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6kbl]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Oryza_sativa_Indica_Group Oryza sativa Indica Group]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6KBL OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6KBL 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]] 1.7&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=CAC:CACODYLATE+ION'>CAC</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</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=6kbl FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6kbl OCA], [https://pdbe.org/6kbl PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6kbl RCSB], [https://www.ebi.ac.uk/pdbsum/6kbl PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6kbl ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/B8AC38_ORYSI B8AC38_ORYSI] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Aldo-keto reductases (AKRs) are NADPH/NADP(+)-dependent oxidoreductase enzymes that metabolize an aldehyde/ketone to the corresponding alcohol. AKR4C14 from rice exhibits a much higher efficiency in metabolizing malondialdehyde (MDA) than do the Arabidopsis enzymes AKR4C8 and AKR4C9, despite sharing greater than 60% amino-acid sequence identity. This study confirms the role of rice AKR4C14 in the detoxification of methylglyoxal and MDA, and demonstrates that the endogenous contents of both aldehydes in transgenic Arabidopsis ectopically expressing AKR4C14 are significantly lower than their levels in the wild type. The apo structure of indica rice AKR4C14 was also determined in the absence of the cofactor, revealing the stabilized open conformation. This is the first crystal structure in AKR subfamily 4C from rice to be observed in the apo form (without bound NADP(+)). The refined AKR4C14 structure reveals a stabilized open conformation of loop B, suggesting the initial phase prior to cofactor binding. Based on the X-ray crystal structure, the substrate- and cofactor-binding pockets of AKR4C14 are formed by loops A, B, C and beta1alpha1. Moreover, the residues Ser211 and Asn220 on loop B are proposed as the hinge residues that are responsible for conformational alteration while the cofactor binds. The open conformation of loop B is proposed to involve Phe216 pointing out from the cofactor-binding site and the opening of the safety belt. Structural comparison with other AKRs in subfamily 4C emphasizes the role of the substrate-channel wall, consisting of Trp24, Trp115, Tyr206, Phe216, Leu291 and Phe295, in substrate discrimination. In particular, Leu291 could contribute greatly to substrate selectivity, explaining the preference of AKR4C14 for its straight-chain aldehyde substrate.

Structure-function study of AKR4C14, an aldo-keto reductase from Thai jasmine rice (Oryza sativa L. ssp. indica cv. KDML105).,Songsiriritthigul C, Narawongsanont R, Tantitadapitak C, Guan HH, Chen CJ Acta Crystallogr D Struct Biol. 2020 May 1;76(Pt 5):472-483. doi:, 10.1107/S2059798320004313. Epub 2020 Apr 23. PMID:32355043<ref>PMID:32355043</ref>

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

==See Also==
*[[Aldo-keto reductase 3D structures|Aldo-keto reductase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Oryza sativa Indica Group]]
[[Category: Chen CJ]]
[[Category: Guan HH]]
[[Category: Narawongsanont R]]
[[Category: Songsiriritthigul C]]