7cit: Difference between revisions
New page: '''Unreleased structure''' The entry 7cit is ON HOLD Authors: Oda, K., Matoba, Y. Description: Crystal structure of tyrosinase from Streptomyces castaneoglobisporus in complex with the... |
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==Crystal structure of tyrosinase from Streptomyces castaneoglobisporus in complex with the caddie protein obtained by soaking in the solution containing Cu(II) and hydroxylamine for 24 h== | |||
<StructureSection load='7cit' size='340' side='right'caption='[[7cit]], [[Resolution|resolution]] 1.50Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[7cit]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Streptomyces_castaneoglobisporus Streptomyces castaneoglobisporus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7CIT OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7CIT 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]] 1.5Å</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=G1X:(2S)-2-azanyl-3-[3,4-bis(oxidanylidene)cyclohexa-1,5-dien-1-yl]propanoic+acid'>G1X</scene>, <scene name='pdbligand=NO3:NITRATE+ION'>NO3</scene>, <scene name='pdbligand=PEO:HYDROGEN+PEROXIDE'>PEO</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=7cit FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7cit OCA], [https://pdbe.org/7cit PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7cit RCSB], [https://www.ebi.ac.uk/pdbsum/7cit PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7cit ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/Q83WS2_9ACTN Q83WS2_9ACTN] | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Tyrosinase (Ty) and catechol oxidase (CO) are members of type-3 copper enzymes. While Ty catalyzes both phenolase and catecholase reactions, CO catalyzes only the latter reaction. In the present study, Ty was found to catalyze the catecholase reaction, but hardly the phenolase reaction in the presence of the metallochaperon called "caddie protein (Cad)". The ability of the substrates to dissociate the motif shielding the active-site pocket seems to contribute critically to the substrate specificity of Ty. In addition, a mutation at the N191 residue, which forms a hydrogen bond with a water molecule near the active center, decreased the inherent ratio of phenolase versus catecholase activity. Unlike the wild-type complex, reaction intermediates were not observed when the catalytic reaction toward the Y98 residue of Cad was progressed in the crystalline state. The increased basicity of the water molecule may be necessary to inhibit the proton transfer from the conjugate acid to a hydroxide ion bridging the two copper ions. The deprotonation of the substrate hydroxyl by the bridging hydroxide seems to be significant for the efficient catalytic cycle of the phenolase reaction. | |||
The basicity of an active-site water molecule discriminates between tyrosinase and catechol oxidase activity.,Matoba Y, Oda K, Muraki Y, Masuda T Int J Biol Macromol. 2021 Jul 31;183:1861-1870. doi: , 10.1016/j.ijbiomac.2021.05.206. Epub 2021 Jun 2. PMID:34089758<ref>PMID:34089758</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
[[Category: | </div> | ||
[[Category: | <div class="pdbe-citations 7cit" style="background-color:#fffaf0;"></div> | ||
[[Category: Matoba | |||
==See Also== | |||
*[[Tyrosinase 3D structures|Tyrosinase 3D structures]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Large Structures]] | |||
[[Category: Streptomyces castaneoglobisporus]] | |||
[[Category: Matoba Y]] | |||
[[Category: Oda K]] | |||
Latest revision as of 19:09, 29 November 2023
Crystal structure of tyrosinase from Streptomyces castaneoglobisporus in complex with the caddie protein obtained by soaking in the solution containing Cu(II) and hydroxylamine for 24 hCrystal structure of tyrosinase from Streptomyces castaneoglobisporus in complex with the caddie protein obtained by soaking in the solution containing Cu(II) and hydroxylamine for 24 h
Structural highlights
FunctionPublication Abstract from PubMedTyrosinase (Ty) and catechol oxidase (CO) are members of type-3 copper enzymes. While Ty catalyzes both phenolase and catecholase reactions, CO catalyzes only the latter reaction. In the present study, Ty was found to catalyze the catecholase reaction, but hardly the phenolase reaction in the presence of the metallochaperon called "caddie protein (Cad)". The ability of the substrates to dissociate the motif shielding the active-site pocket seems to contribute critically to the substrate specificity of Ty. In addition, a mutation at the N191 residue, which forms a hydrogen bond with a water molecule near the active center, decreased the inherent ratio of phenolase versus catecholase activity. Unlike the wild-type complex, reaction intermediates were not observed when the catalytic reaction toward the Y98 residue of Cad was progressed in the crystalline state. The increased basicity of the water molecule may be necessary to inhibit the proton transfer from the conjugate acid to a hydroxide ion bridging the two copper ions. The deprotonation of the substrate hydroxyl by the bridging hydroxide seems to be significant for the efficient catalytic cycle of the phenolase reaction. The basicity of an active-site water molecule discriminates between tyrosinase and catechol oxidase activity.,Matoba Y, Oda K, Muraki Y, Masuda T Int J Biol Macromol. 2021 Jul 31;183:1861-1870. doi: , 10.1016/j.ijbiomac.2021.05.206. Epub 2021 Jun 2. PMID:34089758[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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