View source for 5l86


==engineered ascorbate peroxidise==
<StructureSection load='5l86' size='340' side='right' caption='[[5l86]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5l86]] is a 2 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5L86 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5L86 FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr>
<tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=MHS:N1-METHYLATED+HISTIDINE'>MHS</scene></td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/L-ascorbate_peroxidase L-ascorbate peroxidase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.11.1.11 1.11.1.11] </span></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=5l86 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5l86 OCA], [http://pdbe.org/5l86 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5l86 RCSB], [http://www.ebi.ac.uk/pdbsum/5l86 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5l86 ProSAT]</span></td></tr>
</table>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Enzymes rely on complex interactions between precisely positioned active site residues as a mechanism to compensate for the limited functionality contained within the genetic code. Heme enzymes provide a striking example of this complexity, whereby the electronic properties of reactive ferryl intermediates are finely tuned through hydrogen bonding interactions between proximal ligands and neighboring amino acids. Here, we show that introduction of a chemically programmed proximal Ndelta-methyl histidine (NMH) ligand into an engineered ascorbate peroxidase (APX2) overcomes the reliance on the conserved Asp-His hydrogen bonding interaction, leading to a catalytically modified enzyme (APX2 NMH), which is able to achieve a significantly higher number of turnovers compared with APX2 without compromising catalytic efficiency. Structural, spectroscopic and kinetic characterization of APX2 NMH and several active site variants provides valuable insights into the role of the Asp-His-Fe triad of heme peroxidases. More significantly, simplification of catalytic mechanisms through the incorporation of chemically optimized ligands may facilitate efforts to create and evolve new active site heme environments within proteins.

A Chemically Programmed Proximal Ligand Enhances the Catalytic Properties of a Heme Enzyme.,Green AP, Hayashi T, Mittl PR, Hilvert D J Am Chem Soc. 2016 Sep 7;138(35):11344-52. doi: 10.1021/jacs.6b07029. Epub 2016 , Aug 26. PMID:27500802<ref>PMID:27500802</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 5l86" style="background-color:#fffaf0;"></div>

==See Also==
*[[Ascorbate peroxidase|Ascorbate peroxidase]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: L-ascorbate peroxidase]]
[[Category: Hayashi, T]]
[[Category: Hilvert, D]]
[[Category: Mittl, P]]
[[Category: Apx2]]
[[Category: Heme]]
[[Category: Methyl histidine]]
[[Category: Oxidoreductase]]
[[Category: Peroxidase]]
[[Category: Protein engineering]]