View source for 7ron


==Crystal structure of the Friedel-Crafts alkylating enzyme CylK from Cylindospermum licheniforme==
<StructureSection load='7ron' size='340' side='right'caption='[[7ron]], [[Resolution|resolution]] 1.68&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[7ron]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Cylindrospermum_licheniforme_UTEX_B_2014 Cylindrospermum licheniforme UTEX B 2014]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7RON OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7RON 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]] 1.68&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</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=7ron FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7ron OCA], [https://pdbe.org/7ron PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7ron RCSB], [https://www.ebi.ac.uk/pdbsum/7ron PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7ron ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/A0A1Y0K711_9NOST A0A1Y0K711_9NOST] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The cyanobacterial enzyme CylK assembles the cylindrocyclophane natural products by performing two unusual alkylation reactions, forming new carbon-carbon bonds between aromatic rings and secondary alkyl halide substrates. This transformation is unprecedented in biology, and the structure and mechanism of CylK are unknown. Here, we report X-ray crystal structures of CylK, revealing a distinctive fusion of a Ca(2+)-binding domain and a beta-propeller fold. We use a mutagenic screening approach to locate CylK's active site at its domain interface, identifying two residues, Arg105 and Tyr473, that are required for catalysis. Anomalous diffraction datasets collected with bound bromide ions, a product analog, suggest that these residues interact with the alkyl halide electrophile. Additional mutagenesis and molecular dynamics simulations implicate Asp440 in activating the nucleophilic aromatic ring. Bioinformatic analysis of CylK homologs from other cyanobacteria establishes that they conserve these key catalytic amino acids, but they are likely associated with divergent reactivity and altered secondary metabolism. By gaining a molecular understanding of this unusual biosynthetic transformation, this work fills a gap in our understanding of how alkyl halides are activated and used by enzymes as biosynthetic intermediates, informing enzyme engineering, catalyst design, and natural product discovery.

Structural basis for an unprecedented enzymatic alkylation in cylindrocyclophane biosynthesis.,Braffman NR, Ruskoski TB, Davis KM, Glasser NR, Johnson C, Okafor CD, Boal AK, Balskus EP Elife. 2022 Feb 25;11. pii: 75761. doi: 10.7554/eLife.75761. PMID:35212625<ref>PMID:35212625</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
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== References ==
<references/>
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</StructureSection>
[[Category: Cylindrospermum licheniforme UTEX B 2014]]
[[Category: Large Structures]]
[[Category: Boal AK]]
[[Category: Ruskoski TB]]