2eg5

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[[Image:2eg5.png|left|200px]]
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==The structure of xanthosine methyltransferase==
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<StructureSection load='2eg5' size='340' side='right' caption='[[2eg5]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[2eg5]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Coffea_canephora Coffea canephora]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2EG5 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2EG5 FirstGlance]. <br>
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</td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=SAH:S-ADENOSYL-L-HOMOCYSTEINE'>SAH</scene>, <scene name='pdbligand=XTS:9-[(2R,3R,4S,5R)-3,4-DIHYDROXY-5-(HYDROXYMETHYL)OXOLAN-2-YL]-3H-PURINE-2,6-DIONE'>XTS</scene><br>
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<tr><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[2efj|2efj]]</td></tr>
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<tr><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">XMT1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=49390 Coffea canephora])</td></tr>
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<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2eg5 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2eg5 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=2eg5 RCSB], [http://www.ebi.ac.uk/pdbsum/2eg5 PDBsum]</span></td></tr>
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<table>
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/eg/2eg5_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/chain_selection.php?pdb_ID=2ata ConSurf].
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<div style="clear:both"></div>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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Caffeine (1,3,7-trimethylxanthine) is a secondary metabolite produced by certain plant species and an important component of coffee (Coffea arabica and Coffea canephora) and tea (Camellia sinensis). Here we describe the structures of two S-adenosyl-l-methionine-dependent N-methyltransferases that mediate caffeine biosynthesis in C. canephora 'robusta', xanthosine (XR) methyltransferase (XMT), and 1,7-dimethylxanthine methyltransferase (DXMT). Both were cocrystallized with the demethylated cofactor, S-adenosyl-L-cysteine, and substrate, either xanthosine or theobromine. Our structures reveal several elements that appear critical for substrate selectivity. Serine-316 in XMT appears central to the recognition of XR. Likewise, a change from glutamine-161 in XMT to histidine-160 in DXMT is likely to have catalytic consequences. A phenylalanine-266 to isoleucine-266 change in DXMT is also likely to be crucial for the discrimination between mono and dimethyl transferases in coffee. These key residues are probably functionally important and will guide future studies with implications for the biosynthesis of caffeine and its derivatives in plants.
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{{STRUCTURE_2eg5| PDB=2eg5 | SCENE= }}
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The structure of two N-methyltransferases from the caffeine biosynthetic pathway.,McCarthy AA, McCarthy JG Plant Physiol. 2007 Jun;144(2):879-89. Epub 2007 Apr 13. PMID:17434991<ref>PMID:17434991</ref>
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===The structure of xanthosine methyltransferase===
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
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{{ABSTRACT_PUBMED_17434991}}
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== References ==
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<references/>
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==About this Structure==
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__TOC__
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[[2eg5]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Coffea_canephora Coffea canephora]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2EG5 OCA].
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</StructureSection>
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==Reference==
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<ref group="xtra">PMID:017434991</ref><ref group="xtra">PMID:017401201</ref><references group="xtra"/>
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[[Category: Coffea canephora]]
[[Category: Coffea canephora]]
[[Category: McCarthy, A A.]]
[[Category: McCarthy, A A.]]

Revision as of 01:40, 30 September 2014

The structure of xanthosine methyltransferase

2eg5, resolution 2.20Å

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OCA

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