View source for 3wzn


==Crystal structure of the core streptavidin mutant V21 (Y22S/N23D/S27D/Y83S/R84K/E101D/R103K/E116N) complexed with biotin at 1.3 A resolution==
<StructureSection load='3wzn' size='340' side='right'caption='[[3wzn]], [[Resolution|resolution]] 1.30&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3wzn]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Streptomyces_avidinii Streptomyces avidinii]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3WZN OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3WZN 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]] 1.3&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=BTN:BIOTIN'>BTN</scene>, <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=3wzn FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3wzn OCA], [https://pdbe.org/3wzn PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3wzn RCSB], [https://www.ebi.ac.uk/pdbsum/3wzn PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3wzn ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/SAV_STRAV SAV_STRAV] The biological function of streptavidin is not known. Forms a strong non-covalent specific complex with biotin (one molecule of biotin per subunit of streptavidin).
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
For a multistep pre-targeting method using antibodies, a streptavidin mutant with low immunogenicity, termed low immunogenic streptavidin mutant No. 314 (LISA-314), was produced previously as a drug delivery tool. However, endogenous biotins (BTNs) with high affinity (Kd &lt; 10-10 M) for the binding pocket of LISA-314 prevents access of exogenous BTN-labelled anticancer drugs. In this study, we improve the binding pocket of LISA-314 to abolish its affinity for endogenous BTN species, therefore ensuring that the newly designed LISA-314 binds only artificial BTN analogue. The replacement of three amino acid residues was performed in two steps to develop a mutant termed V212, which selectively binds to 6-(5-((3aS,4S,6aR)-2-iminohexahydro-1H-thieno[3,4-d]imidazol-4-yl)pentanamido)hex anoic acid (iminobiotin long tail, IMNtail). Surface plasmon resonance results showed that V212 has a Kd value of 5.9 x 10-7 M towards IMNtail, but no binding affinity for endogenous BTN species. This V212/IMNtail system will be useful as a novel delivery tool for anticancer therapy.

Structure-based design of a streptavidin mutant specific for an artificial biotin analogue.,Kawato T, Mizohata E, Shimizu Y, Meshizuka T, Yamamoto T, Takasu N, Matsuoka M, Matsumura H, Kodama T, Kanai M, Doi H, Inoue T, Sugiyama A J Biochem. 2015 Feb 2. pii: mvv004. PMID:25645976<ref>PMID:25645976</ref>

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

==See Also==
*[[Avidin 3D structures|Avidin 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Streptomyces avidinii]]
[[Category: Doi H]]
[[Category: Inoue T]]
[[Category: Kanai M]]
[[Category: Kawato T]]
[[Category: Kodama T]]
[[Category: Matsumura H]]
[[Category: Matsuoka M]]
[[Category: Meshizuka T]]
[[Category: Mizohata E]]
[[Category: Shimizu Y]]
[[Category: Sugiyama A]]
[[Category: Takasu N]]
[[Category: Tsumoto K]]
[[Category: Yamamoto T]]