View source for 7cts


==Open form of PET-degrading cutinase Cut190 with thermostability-improving mutations of S226P/R228S/Q138A/D250C-E296C/Q123H/N202H and S176A inactivation==
<StructureSection load='7cts' size='340' side='right'caption='[[7cts]], [[Resolution|resolution]] 1.10&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7CTS OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7CTS 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]] 1.1&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=BCN:BICINE'>BCN</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=DIO:1,4-DIETHYLENE+DIOXIDE'>DIO</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=7cts FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7cts OCA], [https://pdbe.org/7cts PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7cts RCSB], [https://www.ebi.ac.uk/pdbsum/7cts PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7cts ProSAT]</span></td></tr>
</table>
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== Publication Abstract from PubMed ==
The cutinase-like enzyme from the thermophile Saccharomonospora viridis AHK190, Cut190, is a good candidate to depolymerize polyethylene terephthalate (PET) efficiently. We previously developed a mutant of Cut190 (S226P/R228S), which we designated as Cut190* that has both increased activity and stability and solved its crystal structure. Recently, we showed that mutation of D250C/E296C on one of the Ca(2+) -binding sites resulted in a higher thermal stability while retaining its polyesterase activity. In this study, we solved the crystal structures of Cut190* mutants, Q138A/D250C-E296C/Q123H/N202H, designated as Cut190*SS, and its inactive S176A mutant, Cut190*SS_S176A, at high resolution. The overall structures were similar to those of Cut190* and Cut190*S176A reported previously. As expected, Cys250 and Cys296 were closely located to form a disulfide bond, which would assuredly contribute to increase the stability. Isothermal titration calorimetry experiments and 3D Reference Interaction Site Model calculations showed that the metal-binding properties of the Cut190*SS series were different from those of the Cut190* series. However, our results show that binding of Ca(2+) to the weak binding site, site 1, would be retained, enabling Cut190*SS to keep its ability to use Ca(2+) to accelerate the conformational change from the closed (inactive) to the open (active) form. While increasing the thermal stability, Cut190*SS could still express its enzymatic function. Even after incubation at 70 degrees C, which corresponds to the glass transition temperature of PET, the enzyme retained its activity well, implying a high applicability for industrial PET depolymerization using Cut190*SS.

Structural basis of mutants of PET-degrading enzyme from Saccharomonospora viridis AHK190 with high activity and thermal stability.,Emori M, Numoto N, Senga A, Bekker GJ, Kamiya N, Kobayashi Y, Ito N, Kawai F, Oda M Proteins. 2020 Dec 19. doi: 10.1002/prot.26034. PMID:33340163<ref>PMID:33340163</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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==See Also==
*[[Cutinase 3D structures|Cutinase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Bekker GJ]]
[[Category: Emori M]]
[[Category: Ito N]]
[[Category: Kamiya N]]
[[Category: Kawai F]]
[[Category: Numoto N]]
[[Category: Oda M]]
[[Category: Senga A]]