View source for 3szj


==Structure of the shwanavidin-biotin complex==
<StructureSection load='3szj' size='340' side='right'caption='[[3szj]], [[Resolution|resolution]] 1.45&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3szj]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Shewanella_denitrificans_OS217 Shewanella denitrificans OS217]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3SZJ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3SZJ 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]] 1.45&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ACY:ACETIC+ACID'>ACY</scene>, <scene name='pdbligand=BTN:BIOTIN'>BTN</scene>, <scene name='pdbligand=CO3:CARBONATE+ION'>CO3</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</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=3szj FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3szj OCA], [https://pdbe.org/3szj PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3szj RCSB], [https://www.ebi.ac.uk/pdbsum/3szj PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3szj ProSAT]</span></td></tr>
</table>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Shwanavidin is an avidin-like protein from the marine proteobactrium Shewanella denitrificans, which exhibits an innate dimeric structure while maintaining high affinity towards biotin. A unique residue (Phe-43) from the L3,4 loop and a distinctive disulfide bridge were shown to account for the high affinity towards biotin. Phe-43 emulates the function and position of the critical intermonomeric Trp that characterizes the tetrameric avidins but is lacking in shwanavidin. The 18 copies of the apo monomer revealed distinctive snapshots of L3,4 and Phe-43, providing rare insight into loop flexibility, binding-site accessibility and psychrophilic adaptation. Nevertheless, as in all avidins, shwanavidin also displays high thermostability properties. The unique features of shwanavidin may provide a platform for the design of a long-sought-after monovalent form of avidin, which would be ideal for novel types of biotechnological application.

Structural Adaptation of a Thermostable Biotin-Binding Protein in a Psychrophilic Environment.,Meir A, Bayer EA, Livnah O J Biol Chem. 2012 Apr 5. PMID:22493427<ref>PMID:22493427</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 3szj" style="background-color:#fffaf0;"></div>

==See Also==
*[[Avidin 3D structures|Avidin 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Shewanella denitrificans OS217]]
[[Category: Livnah O]]
[[Category: Meir A]]