View source for 6abo


==human XRCC4 and IFFO1 complex==
<StructureSection load='6abo' size='340' side='right'caption='[[6abo]], [[Resolution|resolution]] 2.65&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6abo]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6ABO OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6ABO 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]] 2.65&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GOL:GLYCEROL'>GOL</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=6abo FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6abo OCA], [https://pdbe.org/6abo PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6abo RCSB], [https://www.ebi.ac.uk/pdbsum/6abo PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6abo ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/XRCC4_HUMAN XRCC4_HUMAN] Involved in DNA non-homologous end joining (NHEJ) required for double-strand break repair and V(D)J recombination. Binds to DNA and to DNA ligase IV (LIG4). The LIG4-XRCC4 complex is responsible for the NHEJ ligation step, and XRCC4 enhances the joining activity of LIG4. Binding of the LIG4-XRCC4 complex to DNA ends is dependent on the assembly of the DNA-dependent protein kinase complex DNA-PK to these DNA ends.<ref>PMID:8548796</ref> <ref>PMID:10854421</ref> <ref>PMID:10757784</ref> <ref>PMID:16412978</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Chromosome translocation is a major cause of the onset and progression of diverse types of cancers. However, the mechanisms underlying this process remain poorly understood. Here, we identified a non-homologous end-joining protein, IFFO1, which structurally forms a heterotetramer with XRCC4. IFFO1 is recruited to the sites of DNA damage by XRCC4 and promotes the repair of DNA double-strand breaks in a parallel pathway with XLF. Interestingly, IFFO1 interacts with lamin A/C, forming an interior nucleoskeleton. Inactivating IFFO1 or its interaction with XRCC4 or lamin A/C leads to increases in both the mobility of broken ends and the frequency of chromosome translocation. Importantly, the destruction of this nucleoskeleton accounts for the elevated frequency of chromosome translocation in many types of cancer cells. Our results reveal that the lamin A/C-IFFO1-constituted nucleoskeleton prevents chromosome translocation by immobilizing broken DNA ends during tumorigenesis.

The nucleoskeleton protein IFFO1 immobilizes broken DNA and suppresses chromosome translocation during tumorigenesis.,Li W, Bai X, Li J, Zhao Y, Liu J, Zhao H, Liu L, Ding M, Wang Q, Shi FY, Hou M, Ji J, Gao G, Guo R, Sun Y, Liu Y, Xu D Nat Cell Biol. 2019 Oct;21(10):1273-1285. doi: 10.1038/s41556-019-0388-0. Epub, 2019 Sep 23. PMID:31548606<ref>PMID:31548606</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6abo" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Li J]]
[[Category: Liang H]]
[[Category: Liu L]]
[[Category: Liu Y]]
[[Category: Xu D]]