6ess: Difference between revisions
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<StructureSection load='6ess' size='340' side='right'caption='[[6ess]], [[Resolution|resolution]] 1.91Å' scene=''> | <StructureSection load='6ess' size='340' side='right'caption='[[6ess]], [[Resolution|resolution]] 1.91Å' scene=''> | ||
== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>[[6ess]] is a 1 chain structure with sequence from [ | <table><tr><td colspan='2'>[[6ess]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Streptomyces_avidinii Streptomyces avidinii]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6ESS OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6ESS FirstGlance]. <br> | ||
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=4IR:{N-(4-{[2-(AMINO-KAPPAN)ETHYL]SULFAMOYL-KAPPAN}PHENYL)-5-[(3AS,4S,6AR)-2-OXOHEXAHYDRO-1H-THIENO[3,4-D]IMIDAZOL-4-YL]PENTANAMIDE}(CHLORO)[(1,2,3,4,5-ETA)-1,2,3,4,5-PENTAMETHYLCYCLOPENTADIENYL]IRIDIUM(III)'>4IR</scene>, <scene name='pdbligand=IR:IRIDIUM+ION'>IR</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]] 1.91Å</td></tr> | ||
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[ | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=4IR:{N-(4-{[2-(AMINO-KAPPAN)ETHYL]SULFAMOYL-KAPPAN}PHENYL)-5-[(3AS,4S,6AR)-2-OXOHEXAHYDRO-1H-THIENO[3,4-D]IMIDAZOL-4-YL]PENTANAMIDE}(CHLORO)[(1,2,3,4,5-ETA)-1,2,3,4,5-PENTAMETHYLCYCLOPENTADIENYL]IRIDIUM(III)'>4IR</scene>, <scene name='pdbligand=IR:IRIDIUM+ION'>IR</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=6ess FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6ess OCA], [https://pdbe.org/6ess PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6ess RCSB], [https://www.ebi.ac.uk/pdbsum/6ess PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6ess ProSAT]</span></td></tr> | |||
</table> | </table> | ||
== Function == | == Function == | ||
[ | [https://www.uniprot.org/uniprot/SAV_STRAV SAV_STRAV] The biological function of streptavidin is not known. Forms a strong non-covalent specific complex with biotin (one molecule of biotin per subunit of streptavidin). | ||
<div style="background-color:#fffaf0;"> | <div style="background-color:#fffaf0;"> | ||
== Publication Abstract from PubMed == | == Publication Abstract from PubMed == | ||
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__TOC__ | __TOC__ | ||
</StructureSection> | </StructureSection> | ||
[[Category: Large Structures]] | [[Category: Large Structures]] | ||
[[Category: Alonso-Cotchico | [[Category: Streptomyces avidinii]] | ||
[[Category: Heinisch | [[Category: Alonso-Cotchico L]] | ||
[[Category: Hestericova | [[Category: Heinisch T]] | ||
[[Category: Marechal | [[Category: Hestericova M]] | ||
[[Category: Vidossich | [[Category: Marechal J-D]] | ||
[[Category: Ward | [[Category: Vidossich P]] | ||
[[Category: Ward TR]] | |||
Latest revision as of 15:21, 9 May 2024
Artificial imine reductase mutant S112A-N118P-K121A-S122MArtificial imine reductase mutant S112A-N118P-K121A-S122M
Structural highlights
FunctionSAV_STRAV The biological function of streptavidin is not known. Forms a strong non-covalent specific complex with biotin (one molecule of biotin per subunit of streptavidin). Publication Abstract from PubMedArtificial metalloenzymes, resulting from incorporation of a metal cofactor within a host protein, have received increasing attention in the last decade. Herein, we report on the directed evolution of an Artificial Transfer Hydrogenase (ATHase) based on the biotin-streptavidin technology using a straightforward optimized protocol allowing screening in cell free extracts. Our efforts yielded two streptavidin isoforms with improved catalytic activity and selectivity for the reduction of cyclic imines. Gratifyingly, the evolved ATHases proved stable under biphasic catalytic conditions. The X-ray structure analysis reveals that introducing bulky residues within the active site results in flexibility changes of the cofactor, thus increasing exposure of the metal to the protein surface and leading to a reversal of enantioselectivity. This hypothesis was confirmed by a multiscale approach based mostly on molecular dynamics and protein-ligand dockings. Directed Evolution of Artificial Imine Reductase.,Hestericova M, Heinisch T, Alonso-Cotchico L, Marechal JD, Vidossich P, Ward TR Angew Chem Int Ed Engl. 2017 Dec 19. doi: 10.1002/anie.201711016. PMID:29265726[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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