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| | ==X-ray crystal structure of the second XRCC1 BRCT domain.== | | ==X-ray crystal structure of the second XRCC1 BRCT domain.== |
| - | <StructureSection load='3pc6' size='340' side='right' caption='[[3pc6]], [[Resolution|resolution]] 1.90Å' scene=''> | + | <StructureSection load='3pc6' size='340' side='right'caption='[[3pc6]], [[Resolution|resolution]] 1.90Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[3pc6]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Lk3_transgenic_mice Lk3 transgenic mice]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3PC6 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3PC6 FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[3pc6]] is a 2 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=3PC6 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3PC6 FirstGlance]. <br> |
| - | </td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3pc7|3pc7]], [[3pc8|3pc8]], [[3qvg|3qvg]]</td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.9Å</td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">Xrcc-1, Xrcc1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=10090 LK3 transgenic mice])</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=3pc6 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3pc6 OCA], [https://pdbe.org/3pc6 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3pc6 RCSB], [https://www.ebi.ac.uk/pdbsum/3pc6 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3pc6 ProSAT]</span></td></tr> |
| - | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3pc6 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3pc6 OCA], [http://pdbe.org/3pc6 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3pc6 RCSB], [http://www.ebi.ac.uk/pdbsum/3pc6 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=3pc6 ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/XRCC1_MOUSE XRCC1_MOUSE]] Corrects defective DNA strand-break repair and sister chromatid exchange following treatment with ionizing radiation and alkylating agents. | + | [https://www.uniprot.org/uniprot/XRCC1_MOUSE XRCC1_MOUSE] Corrects defective DNA strand-break repair and sister chromatid exchange following treatment with ionizing radiation and alkylating agents. |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Lk3 transgenic mice]] | + | [[Category: Large Structures]] |
| - | [[Category: Cuneo, M J]] | + | [[Category: Mus musculus]] |
| - | [[Category: Krahn, J M]] | + | [[Category: Cuneo MJ]] |
| - | [[Category: London, R E]] | + | [[Category: Krahn JM]] |
| - | [[Category: Brct domain]] | + | [[Category: London RE]] |
| - | [[Category: Dna binding protein]]
| + | |
| - | [[Category: Dna ligase iii-alpha brct2 domain]]
| + | |
| - | [[Category: Dna repair]]
| + | |
| - | [[Category: Protein:protein interaction]]
| + | |
| Structural highlights
Function
XRCC1_MOUSE Corrects defective DNA strand-break repair and sister chromatid exchange following treatment with ionizing radiation and alkylating agents.
Publication Abstract from PubMed
The ultimate step common to almost all DNA repair pathways is the ligation of the nicked intermediate to form contiguous double-stranded DNA. In the mammalian nucleotide and base excision repair pathways, the ligation step is carried out by ligase III-alpha. For efficient ligation, ligase III-alpha is constitutively bound to the scaffolding protein XRCC1 through interactions between the C-terminal BRCT domains of each protein. Although structural data for the individual domains has been available, no structure of the complex has been determined and several alternative proposals for this interaction have been advanced. Interpretation of the models is complicated by the formation of homodimers that, depending on the model, may either contribute to, or compete with heterodimer formation. We report here the structures of both homodimer complexes as well as the heterodimer complex. Structural characterization of the heterodimer formed from a longer XRCC1 BRCT domain construct, including residues comprising the interdomain linker region, revealed an expanded heterodimer interface with the ligase III-alpha BRCT domain. This enhanced linker-mediated binding interface plays a significant role in the determination of heterodimer/homodimer selectivity. These data provide fundamental insights into the structural basis of BRCT-mediated dimerization, and resolve questions related to the organization of this important repair complex.
The structural basis for partitioning of the XRCC1/DNA ligase III-alpha BRCT-mediated dimer complexes.,Cuneo MJ, Gabel SA, Krahn JM, Ricker MA, London RE Nucleic Acids Res. 2011 Sep 1;39(17):7816-27. Epub 2011 Jun 7. PMID:21652643[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Cuneo MJ, Gabel SA, Krahn JM, Ricker MA, London RE. The structural basis for partitioning of the XRCC1/DNA ligase III-alpha BRCT-mediated dimer complexes. Nucleic Acids Res. 2011 Sep 1;39(17):7816-27. Epub 2011 Jun 7. PMID:21652643 doi:10.1093/nar/gkr419
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