View source for 4yyx


==Crystal structure of the ZO-1 PDZ1 domain in complex with the 7-mer Claudin2 C-terminal tail==
<StructureSection load='4yyx' size='340' side='right'caption='[[4yyx]], [[Resolution|resolution]] 1.79&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4yyx]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. This structure supersedes the now removed PDB entry [http://oca.weizmann.ac.il/oca-bin/send-pdb?obs=1&id=4oeq 4oeq]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4YYX OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4YYX 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]] 1.79&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=FMT:FORMIC+ACID'>FMT</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=4yyx FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4yyx OCA], [https://pdbe.org/4yyx PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4yyx RCSB], [https://www.ebi.ac.uk/pdbsum/4yyx PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4yyx ProSAT]</span></td></tr>
</table>
== Disease ==
[https://www.uniprot.org/uniprot/CLD2_HUMAN CLD2_HUMAN] The disease may be caused by variants affecting the gene represented in this entry.
== Function ==
[https://www.uniprot.org/uniprot/ZO1_HUMAN ZO1_HUMAN] The N-terminal may be involved in transducing a signal required for tight junction assembly, while the C-terminal may have specific properties of tight junctions. The alpha domain might be involved in stabilizing junctions. Plays a role in the regulation of cell migration by targeting CDC42BPB to the leading edge of migrating cells.<ref>PMID:21240187</ref> [https://www.uniprot.org/uniprot/CLD2_HUMAN CLD2_HUMAN] Plays a major role in tight junction-specific obliteration of the intercellular space, through calcium-independent cell-adhesion activity.[UniProtKB:O88552]
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The molecular seal between epithelial cells, called the tight junction (TJ), is built by several membrane proteins, with claudins playing the most prominent role. The scaffold proteins of the zonula occludens (ZO) family are required for the correct localization of claudins, and hence formation of the TJ. The intracellular C-terminus of claudins binds to the N-terminal PDZ domain of ZO proteins (PDZ1). Of the 23 identified human claudin proteins, nine possess a tyrosine at the -6 position. Here we show that the claudin affinity for PDZ1 is dependent on the presence or absence of this tyrosine, and that the affinity is reduced if the tyrosine is modified by phosphorylation. The PDZ1 beta2-beta3 loop undergoes a significant conformational change to accommodate this tyrosine. Cell culture experiments support a regulatory role for this tyrosine. Plasticity has been recognized as a critical property of TJs that allow cell remodeling and migration. Our work provides a molecular framework for how TJ plasticity may be regulated.

Structural basis of a key factor regulating the affinity between the zonula occludens first PDZ domain and claudins.,Nomme J, Antanasijevic A, Caffrey M, Van Itallie CM, Anderson JM, Fanning AS, Lavie A J Biol Chem. 2015 May 28. pii: jbc.M115.646695. PMID:26023235<ref>PMID:26023235</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4yyx" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Lavie A]]
[[Category: Nomme J]]