7v6l
From Proteopedia
(Difference between revisions)
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==LcCOMT in complex with SAH== | ==LcCOMT in complex with SAH== | ||
| - | <StructureSection load='7v6l' size='340' side='right'caption='[[7v6l]]' scene=''> | + | <StructureSection load='7v6l' size='340' side='right'caption='[[7v6l]], [[Resolution|resolution]] 1.95Å' scene=''> |
== Structural highlights == | == Structural highlights == | ||
| - | <table><tr><td colspan='2'>Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7V6L OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7V6L FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[7v6l]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Ligusticum_chuanxiong Ligusticum chuanxiong]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7V6L OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7V6L FirstGlance]. <br> |
| - | </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=7v6l FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7v6l OCA], [https://pdbe.org/7v6l PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7v6l RCSB], [https://www.ebi.ac.uk/pdbsum/7v6l PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7v6l ProSAT]</span></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.948Å</td></tr> |
| + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=SAH:S-ADENOSYL-L-HOMOCYSTEINE'>SAH</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=7v6l FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7v6l OCA], [https://pdbe.org/7v6l PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7v6l RCSB], [https://www.ebi.ac.uk/pdbsum/7v6l PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7v6l ProSAT]</span></td></tr> | ||
</table> | </table> | ||
| + | == Function == | ||
| + | [https://www.uniprot.org/uniprot/A0A0K1YW34_9APIA A0A0K1YW34_9APIA] | ||
| + | <div style="background-color:#fffaf0;"> | ||
| + | == Publication Abstract from PubMed == | ||
| + | Caffeic acid O-methyltransferase from Ligusticum chuanxiong (LcCOMT) showed strict regiospecificity despite a relative degree of preference. Compared with caffeic acid, methyl caffeate was the preferential substrate by its low Km and high Kcat. In this study, we obtained the SAM binary (1.80 A) and SAH binary (1.95 A) complex LcCOMT crystal structures, and established the ternary complex structure with methyl caffeate by molecular docking. The active site of LcCOMT included phenolic substrate pocket, SAM/SAH ligand pocket and conserved catalytic residues as well. The regiospecificity of LcCOMT that permitted only 3-hydroxyl group to be methylated arise from the interactions between the active site and the phenyl ring. However, the propanoid tail governed the relative preference of LcCOMT. The ester group in methyl caffeate stabilized the anionic intermediate caused by His268-Asp269 pair, whereas caffeic acid was unable to stabilize the anionic intermediate due to the adjacent carboxylate anion in the propanoid tail. Ser183 residue formed an additional hydrogen bond with SAH and its role was identified by S183A mutation. Ile318 residue might be a potential site for determination of substrate preference, and its mutation led to the change of tertiary conformation. The results supported the selective mechanism of LcCOMT. | ||
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| + | Structure basis of the caffeic acid O-methyltransferase from Ligusiticum chuanxiong to understand its selective mechanism.,Song S, Chen A, Zhu J, Yan Z, An Q, Zhou J, Liao H, Yu Y Int J Biol Macromol. 2022 Jan 1;194:317-330. doi: 10.1016/j.ijbiomac.2021.11.135., Epub 2021 Nov 26. PMID:34838855<ref>PMID:34838855</ref> | ||
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| + | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | ||
| + | </div> | ||
| + | <div class="pdbe-citations 7v6l" style="background-color:#fffaf0;"></div> | ||
| + | == References == | ||
| + | <references/> | ||
__TOC__ | __TOC__ | ||
</StructureSection> | </StructureSection> | ||
[[Category: Large Structures]] | [[Category: Large Structures]] | ||
| + | [[Category: Ligusticum chuanxiong]] | ||
[[Category: CHen Q]] | [[Category: CHen Q]] | ||
[[Category: Yu Y]] | [[Category: Yu Y]] | ||
Current revision
LcCOMT in complex with SAH
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