6yo5: Difference between revisions
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==== | ==Crystal structure of the M295F variant of Ssl1== | ||
<StructureSection load='6yo5' size='340' side='right'caption='[[6yo5]]' scene=''> | <StructureSection load='6yo5' size='340' side='right'caption='[[6yo5]], [[Resolution|resolution]] 1.50Å' scene=''> | ||
== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id= OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol= FirstGlance]. <br> | <table><tr><td colspan='2'>[[6yo5]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Streptomyces_sviceus Streptomyces sviceus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6YO5 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6YO5 FirstGlance]. <br> | ||
</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=6yo5 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6yo5 OCA], [https://pdbe.org/6yo5 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6yo5 RCSB], [https://www.ebi.ac.uk/pdbsum/6yo5 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6yo5 ProSAT]</span></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]] 1.5Å</td></tr> | ||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CU:COPPER+(II)+ION'>CU</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</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=6yo5 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6yo5 OCA], [https://pdbe.org/6yo5 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6yo5 RCSB], [https://www.ebi.ac.uk/pdbsum/6yo5 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6yo5 ProSAT]</span></td></tr> | |||
</table> | </table> | ||
== Function == | |||
[https://www.uniprot.org/uniprot/B5HSR1_STRX2 B5HSR1_STRX2] | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Multicopper oxidases use Cu ions as cofactors to oxidize various substrates. High reduction potential at Type 1 Cu is considered as crucial for effective catalysis. Previous studies have shown that replacing the axial methionine ligand of the Type 1 Cu with leucine or phenylalanine leads to an increased reduction potential, but not always to higher enzyme activity. Here we present a study on six variants of the small laccase Ssl1 from Streptomyces sviceus, where the axial methionine ligand was substituted, and the effect of the axial ligand on reduction potential, activity, spectral properties and structure was investigated. Absorption, electronic circular dichroism and EPR spectra revealed the presence of a stronger coordinating axial ligand like oxygen, which influences the electronic and catalytic properties more than the nature of the amino acid side chain. The crystal structures of the Ssl1 variants were solved, which show that none of the amino acid side chains coordinate to the Cu. Instead, a water molecule is found in the axial coordination site, which support the spectroscopic data. Our findings highlight the importance of combining structural and spectroscopic methods to investigate the effect of amino acid exchange on multicopper oxidases. | |||
Substitution of the Axial Type 1 Cu Ligand Affords Binding of a Water Molecule in Axial Position Affecting Kinetics, Spectral, and Structural Properties of the Small Laccase Ssl1.,Olbrich AC, Mielenbrink S, Willers VP, Koschorreck K, Birrell JA, Span I, Urlacher VB Chemistry. 2024 Nov 14:e202403005. doi: 10.1002/chem.202403005. PMID:39541228<ref>PMID:39541228</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 6yo5" style="background-color:#fffaf0;"></div> | |||
==See Also== | |||
*[[Laccase 3D structures|Laccase 3D structures]] | |||
== References == | |||
<references/> | |||
__TOC__ | __TOC__ | ||
</StructureSection> | </StructureSection> | ||
[[Category: Large Structures]] | [[Category: Large Structures]] | ||
[[Category: | [[Category: Streptomyces sviceus]] | ||
[[Category: Mielenbrink S]] | |||
[[Category: Olbrich A]] | |||
[[Category: Span I]] | |||
[[Category: Urlacher V]] | |||
Latest revision as of 09:24, 4 December 2024
Crystal structure of the M295F variant of Ssl1Crystal structure of the M295F variant of Ssl1
Structural highlights
FunctionPublication Abstract from PubMedMulticopper oxidases use Cu ions as cofactors to oxidize various substrates. High reduction potential at Type 1 Cu is considered as crucial for effective catalysis. Previous studies have shown that replacing the axial methionine ligand of the Type 1 Cu with leucine or phenylalanine leads to an increased reduction potential, but not always to higher enzyme activity. Here we present a study on six variants of the small laccase Ssl1 from Streptomyces sviceus, where the axial methionine ligand was substituted, and the effect of the axial ligand on reduction potential, activity, spectral properties and structure was investigated. Absorption, electronic circular dichroism and EPR spectra revealed the presence of a stronger coordinating axial ligand like oxygen, which influences the electronic and catalytic properties more than the nature of the amino acid side chain. The crystal structures of the Ssl1 variants were solved, which show that none of the amino acid side chains coordinate to the Cu. Instead, a water molecule is found in the axial coordination site, which support the spectroscopic data. Our findings highlight the importance of combining structural and spectroscopic methods to investigate the effect of amino acid exchange on multicopper oxidases. Substitution of the Axial Type 1 Cu Ligand Affords Binding of a Water Molecule in Axial Position Affecting Kinetics, Spectral, and Structural Properties of the Small Laccase Ssl1.,Olbrich AC, Mielenbrink S, Willers VP, Koschorreck K, Birrell JA, Span I, Urlacher VB Chemistry. 2024 Nov 14:e202403005. doi: 10.1002/chem.202403005. PMID:39541228[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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