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| | <StructureSection load='6iwt' size='340' side='right'caption='[[6iwt]], [[Resolution|resolution]] 2.53Å' scene=''> | | <StructureSection load='6iwt' size='340' side='right'caption='[[6iwt]], [[Resolution|resolution]] 2.53Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[6iwt]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Peucedanum_praeruptorum Peucedanum praeruptorum]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6IWT OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6IWT FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[6iwt]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Peucedanum_praeruptorum Peucedanum praeruptorum]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6IWT OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6IWT FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=PEG:DI(HYDROXYETHYL)ETHER'>PEG</scene></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]] 2.53Å</td></tr> |
| - | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6iwt FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6iwt OCA], [http://pdbe.org/6iwt PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6iwt RCSB], [http://www.ebi.ac.uk/pdbsum/6iwt PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6iwt ProSAT]</span></td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=PEG:DI(HYDROXYETHYL)ETHER'>PEG</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=6iwt FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6iwt OCA], [https://pdbe.org/6iwt PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6iwt RCSB], [https://www.ebi.ac.uk/pdbsum/6iwt PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6iwt ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | + | == Function == |
| | + | [https://www.uniprot.org/uniprot/COMTS_KITPR COMTS_KITPR] |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| | [[Category: Peucedanum praeruptorum]] | | [[Category: Peucedanum praeruptorum]] |
| - | [[Category: Wang, N N]] | + | [[Category: Wang NN]] |
| - | [[Category: Zeng, Z X]] | + | [[Category: Zeng ZX]] |
| - | [[Category: Evolution]]
| + | |
| - | [[Category: O-methylation]]
| + | |
| - | [[Category: O-methyltransferase]]
| + | |
| - | [[Category: Transferase]]
| + | |
| Structural highlights
Function
COMTS_KITPR
Publication Abstract from PubMed
Methoxylated coumarins represent a large proportion of officinal value coumarins while only one enzyme specific to bergaptol O-methylation (BMT) has been identified to date. The multiple types of methoxylated coumarins indicate that at least one unknown enzyme participates in the O-methylation of other hydroxylated coumarins and remains to be identified. Combined transcriptome and metabonomics analysis revealed that an enzyme similar to caffeic acid O-methyltransferase (COMT-S, S is short for similar) was involved in catalyzing all the hydroxylated coumarins in Peucedanum praeruptorum. However, the precise molecular mechanism of its substrate heterozygosis remains unsolved. Pursuing this question, we determined the crystal structure of COMT-S to clarify its substrate preference. The result revealed that Asn132, Asp271, and Asn325 govern the substrate heterozygosis of COMT-S. A single mutation, such as N132A, determines the catalytic selectivity of hydroxyl groups in esculetin and also causes production differences in bergapten. Evolution-based analysis indicated that BMT was only recently derived as a paralogue of caffeic acid O-methyltransferase (COMT) via gene duplication, occurring before the Apiaceae family divergence between 37 and 100 mya. The present study identified the previously unknown O-methylation steps in coumarin biosynthesis. The crystallographic and mutational studies provided a deeper understanding of the substrate preference, which can be used for producing specific O-methylation coumarins. Moreover, the evolutionary relationship between BMT and COMT-S was clarified to facilitate understanding of evolutionary events in the Apiaceae family.
The Molecular and Structural Basis of O-methylation Reaction in Coumarin Biosynthesis in Peucedanum praeruptorum Dunn.,Zhao Y, Wang N, Sui Z, Huang C, Zeng Z, Kong L Int J Mol Sci. 2019 Mar 27;20(7). pii: ijms20071533. doi: 10.3390/ijms20071533. PMID:30934718[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Zhao Y, Wang N, Sui Z, Huang C, Zeng Z, Kong L. The Molecular and Structural Basis of O-methylation Reaction in Coumarin Biosynthesis in Peucedanum praeruptorum Dunn. Int J Mol Sci. 2019 Mar 27;20(7). pii: ijms20071533. doi: 10.3390/ijms20071533. PMID:30934718 doi:http://dx.doi.org/10.3390/ijms20071533
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