4ekv

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[[Image:4ekv.jpg|left|200px]]
 
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==Streptavidin 8-aa-loop H127C mutein with reversible biotin binding==
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The line below this paragraph, containing "STRUCTURE_4ekv", creates the "Structure Box" on the page.
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<StructureSection load='4ekv' size='340' side='right'caption='[[4ekv]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
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== Structural highlights ==
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or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
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<table><tr><td colspan='2'>[[4ekv]] is a 1 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=4EKV OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4EKV FirstGlance]. <br>
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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]] 2&#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=BTN:BIOTIN'>BTN</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene></td></tr>
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{{STRUCTURE_4ekv| PDB=4ekv | SCENE= }}
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=4ekv FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4ekv OCA], [https://pdbe.org/4ekv PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4ekv RCSB], [https://www.ebi.ac.uk/pdbsum/4ekv PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4ekv ProSAT]</span></td></tr>
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</table>
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== 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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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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A novel form of tetrameric streptavidin has been engineered to have reversible biotin binding capability. In wild-type streptavidin, loop(3-4) functions as a lid for the entry and exit of biotin. When biotin is bound, interactions between biotin and key residues in loop(3-4) keep this lid in the closed state. In the engineered mutein, a second biotin exit door is created by changing the amino acid sequence of loop(7-8). This door is mobile even in the presence of the bound biotin and can facilitate the release of biotin from the mutein. Since loop(7-8) is involved in subunit interactions, alteration of this loop in the engineered mutein results in an 11 degrees rotation between the two dimers in reference to wild-type streptavidin. The tetrameric state of the engineered mutein is stabilized by a H127C mutation, which leads to the formation of inter-subunit disulfide bonds. The biotin binding kinetic parameters (k(off) of 4.28x10(-4) s(-1) and K(d) of 1.9x10(-8) M) make this engineered mutein a superb affinity agent for the purification of biotinylated biomolecules. Affinity matrices can be regenerated using gentle procedures, and regenerated matrices can be reused at least ten times without any observable reduction in binding capacity. With the combination of both the engineered mutein and wild-type streptavidin, biotinylated biomolecules can easily be affinity purified to high purity and immobilized to desirable platforms without any leakage concerns. Other potential biotechnological applications, such as development of an automated high-throughput protein purification system, are feasible.
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===Streptavidin 8-aa-loop H127C mutein with reversible biotin binding===
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Development of a tetrameric streptavidin mutein with reversible biotin binding capability: engineering a mobile loop as an exit door for biotin.,O'Sullivan VJ, Barrette-Ng I, Hommema E, Hermanson GT, Schofield M, Wu SC, Honetschlaeger C, Ng KK, Wong SL PLoS One. 2012;7(4):e35203. Epub 2012 Apr 19. PMID:22536357<ref>PMID:22536357</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 4ekv" style="background-color:#fffaf0;"></div>
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==See Also==
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The line below this paragraph, {{ABSTRACT_PUBMED_22536357}}, adds the Publication Abstract to the page
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*[[Avidin 3D structures|Avidin 3D structures]]
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(as it appears on PubMed at http://www.pubmed.gov), where 22536357 is the PubMed ID number.
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== References ==
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<references/>
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{{ABSTRACT_PUBMED_22536357}}
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__TOC__
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</StructureSection>
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==About this Structure==
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[[Category: Large Structures]]
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[[4ekv]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Streptomyces_avidinii Streptomyces avidinii]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4EKV OCA].
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==Reference==
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<ref group="xtra">PMID:022536357</ref><references group="xtra"/>
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[[Category: Streptomyces avidinii]]
[[Category: Streptomyces avidinii]]
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[[Category: Barrette-Ng, I H.]]
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[[Category: Barrette-Ng IH]]
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[[Category: Honetschlaeger, C.]]
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[[Category: Honetschlaeger C]]
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[[Category: Ng, K K.S.]]
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[[Category: Ng KKS]]
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[[Category: Wong, S L.]]
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[[Category: Wong SL]]
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[[Category: Beta-barrel]]
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[[Category: Binding protein]]
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[[Category: Biotin-binding]]
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[[Category: Biotin-binding protein]]
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Current revision

Streptavidin 8-aa-loop H127C mutein with reversible biotin binding

PDB ID 4ekv

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