View source for 6n96


==Methylmalonyl-CoA decarboxylase in complex with 2-sulfonate-propionyl-oxa(dethia)-CoA==
<StructureSection load='6n96' size='340' side='right'caption='[[6n96]], [[Resolution|resolution]] 1.70&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6n96]] is a 6 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli_K-12 Escherichia coli K-12]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6N96 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6N96 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=IMD:IMIDAZOLE'>IMD</scene>, <scene name='pdbligand=LCV:(2~{S})-1-[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]ethoxy]-1-oxidanylidene-propane-2-sulfonic+acid'>LCV</scene>, <scene name='pdbligand=SO5:(2~{R})-1-[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]ethoxy]-1-oxidanylidene-propane-2-sulfonic+acid'>SO5</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=6n96 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6n96 OCA], [https://pdbe.org/6n96 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6n96 RCSB], [https://www.ebi.ac.uk/pdbsum/6n96 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6n96 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/SCPB_ECOLI SCPB_ECOLI] Catalyzes the decarboxylation of methylmalonyl-CoA to propionyl-CoA. Could be part of a pathway that converts succinate to propionate.<ref>PMID:10769117</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Malonyl-thioesters are reactive centers of malonyl-CoA and malonyl- S-acyl carrier protein, essential to fatty acid, polyketide and various specialized metabolite biosynthesis. Enzymes that create or use malonyl-thioesters spontaneously hydrolyze or decarboxylate reactants on the crystallographic time frame preventing determination of structure-function relationships. To address this problem, we have synthesized a panel of methylmalonyl-CoA analogs with the carboxylate represented by a sulfonate or nitro and the thioester retained or represented by an ester or amide. Structures of Escherichia coli methylmalonyl-CoA decarboxylase in complex with our analogs affords insight into substrate binding and the catalytic mechanism. Counterintuitively, the negatively charged sulfonate and nitronate functional groups of our analogs bind in an active site hydrophobic pocket. Upon decarboxylation the enolate intermediate is protonated by a histidine preventing CO2-enolate recombination, yielding propionyl-CoA. Activity assays support a histidine catalytic acid and reveal the enzyme displays significant hydrolysis activity. Our structures also provide insight into this hydrolysis activity. Our analogs inhibit decarboxylation/hydrolysis activity with low micromolar Ki values. This study sets precedents for using malonyl-CoA analogs with carboxyate isosteres to study the complicated structure-function relationships of acyl-CoA carboxylases, trans-carboxytransferases, malonyltransferases and beta-ketoacylsynthases.

Sulfonate/Nitro Bearing Methylmalonyl-Thioester Isosteres Applied to Methylmalonyl-CoA Decarboxylase Structure-Function Studies.,Stunkard LM, Dixon AD, Huth TJ, Lohman JR J Am Chem Soc. 2019 Apr 3;141(13):5121-5124. doi: 10.1021/jacs.9b00650. Epub 2019, Mar 19. PMID:30869886<ref>PMID:30869886</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6n96" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Escherichia coli K-12]]
[[Category: Large Structures]]
[[Category: Dixon AD]]
[[Category: Huth TJ]]
[[Category: Lohman JR]]
[[Category: Stunkard LM]]