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{{STRUCTURE_4ckd|  PDB=4ckd  |  SCENE=  }}
===Model of complex between the E.coli enzyme beta-galactosidase and four single chain Fv antibody domains scFv13R4.===


==About this Structure==
==Model of complex between the E.coli enzyme beta-galactosidase and four single chain Fv antibody domains scFv13R4.==
[[4ckd]] is a 12 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4CKD OCA].  
<SX load='4ckd' size='340' side='right' viewer='molstar' caption='[[4ckd]], [[Resolution|resolution]] 13.00&Aring;' scene=''>
[[Category: Beta-galactosidase]]
== Structural highlights ==
[[Category: Henderson, R.]]
<table><tr><td colspan='2'>[[4ckd]] is a 12 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli_K-12 Escherichia coli K-12] and [https://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4CKD OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4CKD FirstGlance]. <br>
[[Category: McMullan, G.]]
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 13&#8491;</td></tr>
[[Category: Vinothkumar, K R.]]
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=4ckd FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4ckd OCA], [https://pdbe.org/4ckd PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4ckd RCSB], [https://www.ebi.ac.uk/pdbsum/4ckd PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4ckd ProSAT]</span></td></tr>
[[Category: Hydrolase-immune system complex]]
</table>
== Function ==
[https://www.uniprot.org/uniprot/KV5A9_MOUSE KV5A9_MOUSE]
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Binding of a single-chain Fv antibody to Escherichia coli beta-galactosidase (beta-gal) is known to stabilize the enzyme and activate several inactive point mutants, historically called antibody-mediated enzyme formation mutants. To understand the nature of this activation, we have determined by electron cryo-microscopy the structure of the complex between beta-gal and the antibody scFv13R4. Our structure localizes the scFv13R4 binding site to the crevice between domains 1 and 3 in each beta-gal subunit. The mutations that scFv13R4 counteracts are located between the antibody binding site and the active site of beta-gal, at one end of the TIM-barrel that forms domain 3 where the substrate lactose is hydrolyzed. The mode of binding suggests how scFv stabilizes both the active site of beta-gal and the tetrameric state.
 
Molecular Mechanism of Antibody-Mediated Activation of beta-galactosidase.,Vinothkumar KR, McMullan G, Henderson R Structure. 2014 Mar 4. pii: S0969-2126(14)00039-2. doi:, 10.1016/j.str.2014.01.011. PMID:24613486<ref>PMID:24613486</ref>
 
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4ckd" style="background-color:#fffaf0;"></div>
 
==See Also==
*[[Antibody 3D structures|Antibody 3D structures]]
*[[Galactosidase 3D structures|Galactosidase 3D structures]]
*[[3D structures of non-human antibody|3D structures of non-human antibody]]
== References ==
<references/>
__TOC__
</SX>
[[Category: Escherichia coli K-12]]
[[Category: Large Structures]]
[[Category: Mus musculus]]
[[Category: Henderson R]]
[[Category: McMullan G]]
[[Category: Vinothkumar KR]]

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