View source for 7p83


==Crystal structure of Apo form of S-adenosylmethionine synthetase from Methanocaldococcus jannaschii==
<StructureSection load='7p83' size='340' side='right'caption='[[7p83]], [[Resolution|resolution]] 2.22&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[7p83]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Methanocaldococcus_jannaschii_DSM_2661 Methanocaldococcus jannaschii DSM 2661]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7P83 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7P83 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]] 2.218&#8491;</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=7p83 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7p83 OCA], [https://pdbe.org/7p83 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7p83 RCSB], [https://www.ebi.ac.uk/pdbsum/7p83 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7p83 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/METK_METJA METK_METJA] Catalyzes the formation of S-adenosylmethionine from methionine and ATP.<ref>PMID:10660563</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Methylation and demethylation of DNA, RNA and proteins constitutes a major regulatory mechanism in epigenetic processes. Investigations would benefit from the ability to install photo-cleavable groups at methyltransferase target sites that block interactions with reader proteins until removed by non-damaging light in the visible spectrum. Engineered methionine adenosyltransferases (MATs) have been exploited in cascade reactions with methyltransferases (MTases) to modify biomolecules with non-natural groups, including first evidence for accepting photo-cleavable groups. We show that an engineered MAT from Methanocaldococcus jannaschii (PC-MjMAT) is 308-fold more efficient at converting ortho-nitrobenzyl-(ONB)-homocysteine than the wildtype enzyme. PC-MjMAT is active over a broad range of temperatures and compatible with MTases from mesophilic organisms. We solved the crystal structures of wildtype and PC-MjMAT in complex with AdoONB and a red-shifted derivative thereof. These structures reveal that aromatic stacking interactions within the ligands are key to accommodating the photocaging groups in PC-MjMAT. The enlargement of the binding pocket eliminates steric clashes to enable AdoMet analogue binding. Importantly, PC-MjMAT exhibits remarkable activity on methionine analogues with red-shifted ONB-derivatives enabling photo-deprotection of modified DNA by visible light.

Visible-Light Removable Photocaging Groups Accepted by MjMAT Variant: Structural Basis and Compatibility with DNA and RNA Methyltransferases.,Peters A, Herrmann E, Cornelissen NV, Klocker N, Kummel D, Rentmeister A Chembiochem. 2021 Oct 4. doi: 10.1002/cbic.202100437. PMID:34606675<ref>PMID:34606675</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 7p83" style="background-color:#fffaf0;"></div>

==See Also==
*[[S-adenosylmethionine synthetase 3D structures|S-adenosylmethionine synthetase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Methanocaldococcus jannaschii DSM 2661]]
[[Category: Cornelissen NV]]
[[Category: Herrmann E]]
[[Category: Kuemmel D]]
[[Category: Peters A]]
[[Category: Rentmeister A]]