View source for 7ao4


==Crystal structure of CotB2 variant W288G==
<StructureSection load='7ao4' size='340' side='right'caption='[[7ao4]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[7ao4]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Streptomyces_melanosporofaciens Streptomyces melanosporofaciens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7AO4 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7AO4 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]] 2.2&#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></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=7ao4 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7ao4 OCA], [https://pdbe.org/7ao4 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7ao4 RCSB], [https://www.ebi.ac.uk/pdbsum/7ao4 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7ao4 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/COTB2_STRMJ COTB2_STRMJ] Catalyzes the cyclization of the linear isoprenoid intermediate geranylgeranyl diphosphate to tricycclic cyclooctat-9-en-7-ol in the cyclooctatin biosynthesis pathway. Cyclooctatin is a potent inhibitor of lysophospholipase.<ref>PMID:19635410</ref> <ref>PMID:24914964</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Terpene synthases generate terpenes employing diversified carbocation chemistry, including highly specific ring formations, proton and hydride transfers, and methyl as well as methylene migrations, followed by reaction quenching. In this enzyme family, the main catalytic challenge is not rate enhancement, but rather structural and reactive control of intrinsically unstable carbocations in order to guide the resulting product distribution. Here we employ multiscale modeling within classical and quantum dynamics frameworks to investigate the reaction mechanism in the diterpene synthase CotB2, commencing with the substrate geranyl geranyl diphosphate and terminating with the carbocation precursor to the final product cyclooctat-9-en-7-ol. The 11-step in-enzyme carbocation cascade is compared with the same reaction in the absence of the enzyme. Remarkably, the free energy profiles in gas phase and in CotB2 are surprisingly similar. This similarity contrasts the multitude of strong pi-cation, dipole-cation, and ion-pair interactions between all intermediates in the reaction cascade and the enzyme, suggesting a remarkable balance of interactions in CotB2. We ascribe this balance to the similar magnitude of the interactions between the carbocations along the reaction coordinate and the enzyme environment. The effect of CotB2 mutations is studied using multiscale mechanistic docking, machine learning, and X-ray crystallography, pointing the way for future terpene synthase design.

The Impression of a Nonexisting Catalytic Effect: The Role of CotB2 in Guiding the Complex Biosynthesis of Cyclooctat-9-en-7-ol.,Raz K, Driller R, Dimos N, Ringel M, Bruck T, Loll B, Major DT J Am Chem Soc. 2020 Dec 8. doi: 10.1021/jacs.0c11348. PMID:33289561<ref>PMID:33289561</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 7ao4" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Streptomyces melanosporofaciens]]
[[Category: Dimos N]]
[[Category: Driller R]]
[[Category: Loll B]]