View source for 4pio


==Ergothioneine-biosynthetic methyltransferase EgtD in complex with N,N-dimethylhistidine and SAH==
<StructureSection load='4pio' size='340' side='right'caption='[[4pio]], [[Resolution|resolution]] 1.51&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4pio]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Mycolicibacterium_smegmatis Mycolicibacterium smegmatis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4PIO OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4PIO 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]] 1.506&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=AVI:N,N-DIMETHYL-L-HISTIDINE'>AVI</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=CSD:3-SULFINOALANINE'>CSD</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <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=4pio FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4pio OCA], [https://pdbe.org/4pio PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4pio RCSB], [https://www.ebi.ac.uk/pdbsum/4pio PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4pio ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/EGTD_MYCS2 EGTD_MYCS2] Catalyzes the methylations of histidine to form N-alpha,N-alpha,N-alpha-trimethyl-L-histidine (also known as hercynine). Histidine and alpha-N,N-dimethylhistidine are preferred substrates.<ref>PMID:20420449</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Ergothioneine is an N-alpha-trimethyl-2-thiohistidine derivative that occurs in human, plant, fungal, and bacterial cells. Biosynthesis of this redox-active betaine starts with trimethylation of the alpha-amino group of histidine. The three consecutive methyl transfers are catalyzed by the S-adenosylmethionine-dependent methyltransferase EgtD. Three crystal structures of this enzyme in the absence and in the presence of N-alpha-dimethylhistidine and S-adenosylhomocysteine implicate a preorganized array of hydrophilic interactions as the determinants for substrate specificity and apparent processivity. We identified two active site mutations that change the substrate specificity of EgtD 107 -fold and transform the histidine-methyltransferase into a proficient tryptophan-methyltransferase. Finally, a genomic search for EgtD homologues in fungal genomes revealed tyrosine and tryptophan trimethylation activity as a frequent trait in ascomycetous and basidomycetous fungi.

Ergothioneine Biosynthetic Methyltransferase EgtD Reveals the Structural Basis of Aromatic Amino Acid Betaine Biosynthesis.,Vit A, Misson L, Blankenfeldt W, Seebeck FP Chembiochem. 2014 Nov 17. doi: 10.1002/cbic.201402522. PMID:25404173<ref>PMID:25404173</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 4pio" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
[[Category: Large Structures]]
[[Category: Mycolicibacterium smegmatis]]
[[Category: Blankenfeldt W]]
[[Category: Seebeck FP]]
[[Category: Vit A]]