View source for 5dt5


==Crystal structure of the GH1 beta-glucosidase from Exiguobacterium antarcticum B7 in space group P21==
<StructureSection load='5dt5' size='340' side='right'caption='[[5dt5]], [[Resolution|resolution]] 2.24&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5dt5]] is a 8 chain structure with sequence from [https://en.wikipedia.org/wiki/Exiguobacterium_antarcticum_B7 Exiguobacterium antarcticum B7]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5DT5 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5DT5 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]] 2.24&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><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=5dt5 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5dt5 OCA], [https://pdbe.org/5dt5 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5dt5 RCSB], [https://www.ebi.ac.uk/pdbsum/5dt5 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5dt5 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/K0A8J9_EXIAB K0A8J9_EXIAB] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Psychrophilic enzymes evolved from a plethora of structural scaffolds via multiple molecular pathways. Elucidating their adaptive strategies is instrumental to understand how life can thrive in cold ecosystems and to tailor enzymes for biotechnological applications at low temperatures. In this work, we used X-ray crystallography, in solution studies and molecular dynamics simulations to reveal the structural basis for cold adaptation of the GH1 beta-glucosidase from Exiguobacterium antarcticum B7. We discovered that the selective pressure of low temperatures favored mutations that redesigned the protein surface, reduced the number of salt bridges, exposed more hydrophobic regions to the solvent and gave rise to a tetrameric arrangement not found in mesophilic and thermophilic homologues. As a result, some solvent-exposed regions became more flexible in the cold-adapted tetramer, likely contributing to enhance enzymatic activity at cold environments. The tetramer stabilizes the native conformation of the enzyme, leading to a 10-fold higher activity compared to the disassembled monomers. According to phylogenetic analysis, diverse adaptive strategies to cold environments emerged in the GH1 family, being tetramerization an alternative, not a rule. These findings reveal a novel strategy for enzyme cold adaptation and provide a framework for the semi-rational engineering of beta-glucosidases aiming at cold industrial processes.

Oligomerization as a strategy for cold adaptation: Structure and dynamics of the GH1 beta-glucosidase from Exiguobacterium antarcticum B7.,Zanphorlin LM, de Giuseppe PO, Honorato RV, Tonoli CC, Fattori J, Crespim E, de Oliveira PS, Ruller R, Murakami MT Sci Rep. 2016 Mar 31;6:23776. doi: 10.1038/srep23776. PMID:27029646<ref>PMID:27029646</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 5dt5" style="background-color:#fffaf0;"></div>

==See Also==
*[[Beta-glucosidase 3D structures|Beta-glucosidase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Exiguobacterium antarcticum B7]]
[[Category: Large Structures]]
[[Category: Giuseppe PO]]
[[Category: Murakami MT]]
[[Category: Tonoli CCC]]
[[Category: Zanphorlin LM]]