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==Structure and stability of an apo thermophilic esterase that hydrolyzes polyhydroxybutyrate==
<StructureSection load='9byu' size='340' side='right'caption='[[9byu]], [[Resolution|resolution]] 1.75&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[9byu]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Lihuaxuella_thermophila Lihuaxuella thermophila]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=9BYU OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=9BYU 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]] 1.75&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=TRS:2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL'>TRS</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=9byu FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=9byu OCA], [https://pdbe.org/9byu PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=9byu RCSB], [https://www.ebi.ac.uk/pdbsum/9byu PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=9byu ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/A0A1H8IKU3_9BACL A0A1H8IKU3_9BACL] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Pollution from plastics is a global problem that threatens the biosphere for a host of reasons, including the time scale that it takes for most plastics to degrade. Biodegradation is an ideal solution for remediating bioplastic waste as it does not require the high temperatures necessary for thermal degradation and does not introduce additional pollutants into the environment. Numerous organisms can scavenge for bioplastics, such as polylactic acid (PLA) or poly-(R)-hydroxybutyrate (PHB), which they can use as an energy source. Recently, a promiscuous PHBase from the thermophilic soil bacterium Lihuaxuella thermophila (LtPHBase) was identified. LtPHBase can accommodate many substrates, including PHB granules and films and PHB block copolymers, as well as the unrelated polymers polylactic acid (PLA) and polycaprolactone (PCL). LtPHBase uses the expected Ser-His-Asp catalytic triad for hydrolysis at an optimal enzyme activity near 70 degrees C. Here, the 1.75 A resolution crystal structure of apo LtPHBase is presented and its chemical stability is profiled. Knowledge of its substrate preferences was extended to different-sized PHB granules. It is shown that LtPHBase is highly resistant to unfolding, with barriers typical for thermophilic enzymes, and shows a preference for low-molecular-mass PHB granules. These insights have implications for the long-term potential of LtPHBase as an industrial PHB hydrolase and shed light on the evolutionary role that this enzyme plays in bacterial metabolism.

Structure and stability of an apo thermophilic esterase that hydrolyzes polyhydroxybutyrate.,Thomas GM, Quirk S, Lieberman RL Acta Crystallogr D Struct Biol. 2024 Nov 1. doi: 10.1107/S2059798324009707. PMID:39441250<ref>PMID:39441250</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 9byu" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Lihuaxuella thermophila]]
[[Category: Huard DJE]]
[[Category: Lieberman RL]]
[[Category: Quirk S]]
[[Category: Thomas GM]]