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'''Unreleased structure'''


The entry 6j1n is ON HOLD
==Anisodus acutangulus type III polyketide sythase AaPKS2 in complex with 4-carboxy-3-oxobutanoyl-CoA==
<StructureSection load='6j1n' size='340' side='right'caption='[[6j1n]], [[Resolution|resolution]] 2.53&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6j1n]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Anisodus_acutangulus Anisodus acutangulus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6J1N OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6J1N 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]] 2.532&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=B7X:5-[2-[3-[[(2~{R})-4-[[[(2~{R},3~{S},4~{R},5~{R})-5-(6-aminopurin-9-yl)-4-oxidanyl-3-phosphonooxy-oxolan-2-yl]methoxy-oxidanyl-phosphoryl]oxy-oxidanyl-phosphoryl]oxy-3,3-dimethyl-2-oxidanyl-butanoyl]amino]propanoylamino]ethylsulfanyl]-3,5-bis(oxidanylidene)pentanoic+acid'>B7X</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=6j1n FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6j1n OCA], [https://pdbe.org/6j1n PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6j1n RCSB], [https://www.ebi.ac.uk/pdbsum/6j1n PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6j1n ProSAT]</span></td></tr>
</table>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The skeleton of tropane alkaloids is derived from ornithine-derived N-methylpyrrolinium and two malonyl-CoA units. The enzymatic mechanism that connects N-methylpyrrolinium and malonyl-CoA units remains unknown. Here, we report the characterization of three pyrrolidine ketide synthases (PYKS), AaPYKS, DsPYKS, and AbPYKS, from three different hyoscyamine- and scopolamine-producing plants. By examining the crystal structure and biochemical activity of AaPYKS, we show that the reaction mechanism involves PYKS-mediated malonyl-CoA condensation to generate a 3-oxo-glutaric acid intermediate that can undergo non-enzymatic Mannich-like condensation with N-methylpyrrolinium to yield the racemic 4-(1-methyl-2-pyrrolidinyl)-3-oxobutanoic acid. This study therefore provides a long sought-after biosynthetic mechanism to explain condensation between N-methylpyrrolinium and acetate units and, more importantly, identifies an unusual plant type III polyketide synthase that can only catalyze one round of malonyl-CoA condensation.


Authors:  
Tropane alkaloids biosynthesis involves an unusual type III polyketide synthase and non-enzymatic condensation.,Huang JP, Fang C, Ma X, Wang L, Yang J, Luo J, Yan Y, Zhang Y, Huang SX Nat Commun. 2019 Sep 6;10(1):4036. doi: 10.1038/s41467-019-11987-z. PMID:31492848<ref>PMID:31492848</ref>


Description:  
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
[[Category: Unreleased Structures]]
</div>
<div class="pdbe-citations 6j1n" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Anisodus acutangulus]]
[[Category: Large Structures]]
[[Category: Fang CL]]
[[Category: Zhang Y]]
Retrieved from "https://proteopedia.org/6j1n"