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[[Image:1lmk.gif|left|200px]]
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{{STRUCTURE_1lmk|  PDB=1lmk  |  SCENE=  }}
'''THE STRUCTURE OF A BIVALENT DIABODY'''


==THE STRUCTURE OF A BIVALENT DIABODY==
<StructureSection load='1lmk' size='340' side='right'caption='[[1lmk]], [[Resolution|resolution]] 2.60&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1lmk]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1LMK OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1LMK 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]] 2.6&#8491;</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=1lmk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1lmk OCA], [https://pdbe.org/1lmk PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1lmk RCSB], [https://www.ebi.ac.uk/pdbsum/1lmk PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1lmk ProSAT]</span></td></tr>
</table>
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/lm/1lmk_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1lmk ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
BACKGROUND: Diabodies are dimeric antibody fragments. In each polypeptide, a heavy-chain variable domain (VH) is linked to a light-chain variable domain (VL) but unlike single-chain Fv fragments, each antigen-binding site is formed by pairing of one VH and one VL domain from the two different polypeptides. Diabodies thus have two antigen-binding sites, and can be bispecific. Direct structural evidence is lacking for the connections and dimeric interactions between the two polypeptides of the diabody. RESULTS: The 2.6 A resolution structure has been determined for a bivalent diabody with a flexible five-residue polypeptide linker between the (amino-terminal) VH and (carboxy-terminal) VL domains. The asymmetric unit of the crystal consists of four polypeptides comprising two diabodies; for one of these polypeptides the linker can be traced between the VH and VL domains. Within each diabody the two associated VH and VL domains make back-to-back interactions through the VH domains, and there is an extensive VL-VL interface between the two diabodies in the asymmetric unit. CONCLUSIONS: The structure of the diabody is very similar to that which had been predicted by molecular modelling. Diabodies directed against cell-surface antigens should be capable of bringing together two cells, such as in cell-targeted therapy, because the two antigen-binding sites of the diabody are at opposite ends of the molecule and separated by approximately 65 A.


==Overview==
Crystal structure of a diabody, a bivalent antibody fragment.,Perisic O, Webb PA, Holliger P, Winter G, Williams RL Structure. 1994 Dec 15;2(12):1217-26. PMID:7704531<ref>PMID:7704531</ref>
BACKGROUND: Diabodies are dimeric antibody fragments. In each polypeptide, a heavy-chain variable domain (VH) is linked to a light-chain variable domain (VL) but unlike single-chain Fv fragments, each antigen-binding site is formed by pairing of one VH and one VL domain from the two different polypeptides. Diabodies thus have two antigen-binding sites, and can be bispecific. Direct structural evidence is lacking for the connections and dimeric interactions between the two polypeptides of the diabody. RESULTS: The 2.6 A resolution structure has been determined for a bivalent diabody with a flexible five-residue polypeptide linker between the (amino-terminal) VH and (carboxy-terminal) VL domains. The asymmetric unit of the crystal consists of four polypeptides comprising two diabodies; for one of these polypeptides the linker can be traced between the VH and VL domains. Within each diabody the two associated VH and VL domains make back-to-back interactions through the VH domains, and there is an extensive VL-VL interface between the two diabodies in the asymmetric unit. CONCLUSIONS: The structure of the diabody is very similar to that which had been predicted by molecular modelling. Diabodies directed against cell-surface antigens should be capable of bringing together two cells, such as in cell-targeted therapy, because the two antigen-binding sites of the diabody are at opposite ends of the molecule and separated by approximately 65 A.


==About this Structure==
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1LMK OCA].
</div>
<div class="pdbe-citations 1lmk" style="background-color:#fffaf0;"></div>


==Reference==
==See Also==
Crystal structure of a diabody, a bivalent antibody fragment., Perisic O, Webb PA, Holliger P, Winter G, Williams RL, Structure. 1994 Dec 15;2(12):1217-26. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/7704531 7704531]
*[[Antibody 3D structures|Antibody 3D structures]]
[[Category: Williams, R L.]]
== References ==
[[Category: Immunoglobulin]]
<references/>
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 00:03:58 2008''
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Mus musculus]]
[[Category: Williams RL]]
Retrieved from "https://proteopedia.org/1lmk"