5y3r

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Current revision (05:43, 3 July 2025) (edit) (undo)
 
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=5y3r FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5y3r OCA], [https://pdbe.org/5y3r PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5y3r RCSB], [https://www.ebi.ac.uk/pdbsum/5y3r PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5y3r ProSAT]</span></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=5y3r FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5y3r OCA], [https://pdbe.org/5y3r PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5y3r RCSB], [https://www.ebi.ac.uk/pdbsum/5y3r PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5y3r ProSAT]</span></td></tr>
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</table>
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== Function ==
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<div style="background-color:#fffaf0;">
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[https://www.uniprot.org/uniprot/XRCC6_HUMAN XRCC6_HUMAN] Single stranded DNA-dependent ATP-dependent helicase. Has a role in chromosome translocation. The DNA helicase II complex binds preferentially to fork-like ends of double-stranded DNA in a cell cycle-dependent manner. It works in the 3'-5' direction. Binding to DNA may be mediated by XRCC6. Involved in DNA non-homologous end joining (NHEJ) required for double-strand break repair and V(D)J recombination. The XRCC5/6 dimer acts as regulatory subunit of the DNA-dependent protein kinase complex DNA-PK by increasing the affinity of the catalytic subunit PRKDC to DNA by 100-fold. The XRCC5/6 dimer is probably involved in stabilizing broken DNA ends and bringing them together. The assembly of the DNA-PK complex to DNA ends is required for the NHEJ ligation step. Required for osteocalcin gene expression. Probably also acts as a 5'-deoxyribose-5-phosphate lyase (5'-dRP lyase), by catalyzing the beta-elimination of the 5' deoxyribose-5-phosphate at an abasic site near double-strand breaks. 5'-dRP lyase activity allows to 'clean' the termini of abasic sites, a class of nucleotide damage commonly associated with strand breaks, before such broken ends can be joined. The XRCC5/6 dimer together with APEX1 acts as a negative regulator of transcription.<ref>PMID:2466842</ref> <ref>PMID:8621488</ref> <ref>PMID:7957065</ref> <ref>PMID:9742108</ref> <ref>PMID:12145306</ref> <ref>PMID:20493174</ref> <ref>PMID:20383123</ref>
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== Publication Abstract from PubMed ==
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DNA-dependent protein kinase (DNA-PK) is a serine/threonine protein kinase complex composed of a catalytic subunit (DNA-PKcs) and KU70/80 heterodimer bound to DNA. DNA-PK holoenzyme plays a critical role in non-homologous end joining (NHEJ), the major DNA repair pathway. Here, we determined cryo-electron microscopy structure of human DNA-PK holoenzyme at 6.6 A resolution. In the complex structure, DNA-PKcs, KU70, KU80 and DNA duplex form a 650-kDa heterotetramer with 1:1:1:1 stoichiometry. The N-terminal alpha-solenoid ( approximately 2 800 residues) of DNA-PKcs adopts a double-ring fold and connects the catalytic core domain of DNA-PKcs and KU70/80-DNA. DNA-PKcs and KU70/80 together form a DNA-binding tunnel, which cradles approximately 30-bp DNA and prevents sliding inward of DNA-PKcs along with DNA duplex, suggesting a mechanism by which the broken DNA end is protected from unnecessary processing. Structural and biochemical analyses indicate that KU70/80 and DNA coordinately induce conformational changes of DNA-PKcs and allosterically stimulate its kinase activity. We propose a model for activation of DNA-PKcs in which allosteric signals are generated upon DNA-PK holoenzyme formation and transmitted to the kinase domain through N-terminal HEAT repeats and FAT domain of DNA-PKcs. Our studies suggest a mechanism for recognition and protection of broken DNA ends and provide a structural basis for understanding the activation of DNA-PKcs and DNA-PK-mediated NHEJ pathway.Cell Research advance online publication 25 August 2017; doi:10.1038/cr.2017.110.
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Cryo-EM structure of human DNA-PK holoenzyme.,Yin X, Liu M, Tian Y, Wang J, Xu Y Cell Res. 2017 Aug 25. doi: 10.1038/cr.2017.110. PMID:28840859<ref>PMID:28840859</ref>
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
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<div class="pdbe-citations 5y3r" style="background-color:#fffaf0;"></div>
== References ==
== References ==
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Current revision

Cryo-EM structure of Human DNA-PK Holoenzyme

5y3r, resolution 6.60Å

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OCA

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