4dne

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== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[4dne]] 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=4DNE OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4DNE FirstGlance]. <br>
<table><tr><td colspan='2'>[[4dne]] 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=4DNE OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4DNE FirstGlance]. <br>
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</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=DTB:6-(5-METHYL-2-OXO-IMIDAZOLIDIN-4-YL)-HEXANOIC+ACID'>DTB</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr>
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.88&#8491;</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=DTB:6-(5-METHYL-2-OXO-IMIDAZOLIDIN-4-YL)-HEXANOIC+ACID'>DTB</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=4dne FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4dne OCA], [https://pdbe.org/4dne PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4dne RCSB], [https://www.ebi.ac.uk/pdbsum/4dne PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4dne ProSAT]</span></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=4dne FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4dne OCA], [https://pdbe.org/4dne PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4dne RCSB], [https://www.ebi.ac.uk/pdbsum/4dne PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4dne ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
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[[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).
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[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).
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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Attempts to crystallize AtNTT1, a chloroplast ATP/ADP transporter from Arabidopsis thaliana, revealed an unexpected contaminant, Strep-Tactin, a variant of streptavidin that was used during purification of the protein. Although it was present in very small amounts, crystals of Strep-Tactin were reproducibly grown from the AtNTT1 solution. AtNTT1 was overexpressed in Escherichia coli and purified from detergent-solubilized membrane fractions using Strep-Tactin affinity chromatography based on an engineered streptavidin. The contamination of protein solutions purified on Strep-Tactin columns has never been described previously and seems to be specific to membrane proteins solubilized in detergents. Trace amounts of Strep-Tactin were observed to be eluted from a Strep-Tactin column using several routinely used detergents, illustrating their possible role in the contamination. This finding raises an alarm and suggests caution in membrane-protein purification using Strep-Tactin affinity columns, where detergents are essential components. The small crystals of contaminant protein led to the structure at 1.9 A resolution of Strep-Tactin in complex with desthiobiotin.
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Contamination from an affinity column: an encounter with a new villain in the world of membrane-protein crystallization.,Panwar P, Deniaud A, Pebay-Peyroula E Acta Crystallogr D Biol Crystallogr. 2012 Oct;68(Pt 10):1272-7. Epub 2012 Sep 13. PMID:22993081<ref>PMID:22993081</ref>
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
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<div class="pdbe-citations 4dne" style="background-color:#fffaf0;"></div>
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==See Also==
==See Also==
*[[Avidin 3D structures|Avidin 3D structures]]
*[[Avidin 3D structures|Avidin 3D structures]]
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== References ==
 
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<references/>
 
__TOC__
__TOC__
</StructureSection>
</StructureSection>

Current revision

Crystal structure of a triple-mutant of streptavidin in complex with desthiobiotin

PDB ID 4dne

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