9uah: Difference between revisions
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==Crystal structure of the OkaE-W79A mutant with a-ketoglutarate and okaramine A== | |||
<StructureSection load='9uah' size='340' side='right'caption='[[9uah]], [[Resolution|resolution]] 2.50Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[9uah]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Penicillium_simplicissimum Penicillium simplicissimum]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=9UAH OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=9UAH 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]] 2.5Å</td></tr> | |||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=AKG:2-OXOGLUTARIC+ACID'>AKG</scene>, <scene name='pdbligand=CO:COBALT+(II)+ION'>CO</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=9uah FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=9uah OCA], [https://pdbe.org/9uah PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=9uah RCSB], [https://www.ebi.ac.uk/pdbsum/9uah PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=9uah ProSAT]</span></td></tr> | |||
</table> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
alpha-Ketoglutarate-dependent mononuclear non-haem iron (alphaKG-NHFe) enzymes are catalytically versatile, yet OkaE is unique for synthesizing azetidine rings via C-C bond formation. Here, we report the unexpected multifunctionality of OkaE, which catalyzes sequential oxidations. Isotopic labelling studies demonstrate that a second O(2) molecule participates in sequential epoxidation and ring cleavage, incorporating two oxygen atoms within a single catalytic cycle to form the previously unknown structure, neuokaramine IV. Crystal structures of the OkaE*Co(II)*alphaKG*okaramine A complex unveil a unique methionine-pi interaction network that facilitates substrate binding. Mutational and crystallographic analyses suggest this network fine-tunes substrate orientation relative to the metallo-centre, activating distinct reaction pathways at the 3a-OH or C8a positions. QM/MM simulations indicate that dynamic rotation of the Fe(IV)=O species initiates the cycle, enabling reaction bifurcation. This study elucidates the structural and mechanistic basis of OkaE's reactivity, highlighting its potential as a programmable biocatalyst for natural product diversification. | |||
Structural and mechanistic insights into azetidine-associated alphaKG-NHFe enzyme OkaE with multifunctional catalysis.,Wang X, Yu J, Liu T, Zhang X, Ju M, Xie Z, Naowarojna N, Ping L, Dong Y, Gong B, Xie Y, Nie Y, Hsiang T, Wu R, Zhang L, Liu P, Zhu G, Yan W, Liu X Nat Commun. 2026 Feb 17. doi: 10.1038/s41467-026-69519-5. PMID:41702921<ref>PMID:41702921</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
[[Category: | </div> | ||
[[Category: | <div class="pdbe-citations 9uah" style="background-color:#fffaf0;"></div> | ||
[[Category: Wang | == References == | ||
[[Category: Yan | <references/> | ||
__TOC__ | |||
</StructureSection> | |||
[[Category: Large Structures]] | |||
[[Category: Penicillium simplicissimum]] | |||
[[Category: Wang XY]] | |||
[[Category: Yan WP]] | |||
[[Category: Yu JJ]] | |||
