4qzd
From Proteopedia
(Difference between revisions)
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| - | ''' | + | ==Mouse Tdt, F405A mutant, in complex with a DSB substrate, C-C base pair== |
| + | <StructureSection load='4qzd' size='340' side='right' caption='[[4qzd]], [[Resolution|resolution]] 2.70Å' scene=''> | ||
| + | == Structural highlights == | ||
| + | <table><tr><td colspan='2'>[[4qzd]] is a 4 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4QZD OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4QZD FirstGlance]. <br> | ||
| + | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=DCT:2,3-DIDEOXYCYTIDINE+5-TRIPHOSPHATE'>DCT</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene></td></tr> | ||
| + | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4i27|4i27]], [[1jms|1jms]], [[4qz8|4qz8]], [[4qz9|4qz9]], [[4qza|4qza]], [[4qzb|4qzb]], [[4qzc|4qzc]], [[4qze|4qze]], [[4qzf|4qzf]], [[4qzg|4qzg]], [[4qzh|4qzh]], [[4qzi|4qzi]]</td></tr> | ||
| + | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/DNA_nucleotidylexotransferase DNA nucleotidylexotransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.7.31 2.7.7.31] </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=4qzd FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4qzd OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4qzd RCSB], [http://www.ebi.ac.uk/pdbsum/4qzd PDBsum]</span></td></tr> | ||
| + | </table> | ||
| + | == Function == | ||
| + | [[http://www.uniprot.org/uniprot/TDT_MOUSE TDT_MOUSE]] Template-independent DNA polymerase which catalyzes the random addition of deoxynucleoside 5'-triphosphate to the 3'-end of a DNA initiator. One of the in vivo functions of this enzyme is the addition of nucleotides at the junction (N region) of rearranged Ig heavy chain and T-cell receptor gene segments during the maturation of B- and T-cells. | ||
| + | <div style="background-color:#fffaf0;"> | ||
| + | == Publication Abstract from PubMed == | ||
| + | Eukaryotic DNA polymerase mu of the PolX family can promote the association of the two 3'-protruding ends of a DNA double-strand break (DSB) being repaired (DNA synapsis) even in the absence of the core non-homologous end-joining (NHEJ) machinery. Here, we show that terminal deoxynucleotidyltransferase (TdT), a closely related PolX involved in V(D)J recombination, has the same property. We solved its crystal structure with an annealed DNA synapsis containing one micro-homology (MH) base pair and one nascent base pair. This structure reveals how the N-terminal domain and Loop 1 of Tdt cooperate for bridging the two DNA ends, providing a templating base in trans and limiting the MH search region to only two base pairs. A network of ordered water molecules is proposed to assist the incorporation of any nucleotide independently of the in trans templating base. These data are consistent with a recent model that explains the statistics of sequences synthesized in vivo by Tdt based solely on this dinucleotide step. Site-directed mutagenesis and functional tests suggest that this structural model is also valid for Pol mu during NHEJ. | ||
| - | + | Structural basis for a novel mechanism of DNA bridging and alignment in eukaryotic DSB DNA repair.,Gouge J, Rosario S, Romain F, Poitevin F, Beguin P, Delarue M EMBO J. 2015 Apr 15;34(8):1126-42. doi: 10.15252/embj.201489643. Epub 2015 Mar, 11. PMID:25762590<ref>PMID:25762590</ref> | |
| - | + | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |
| - | + | </div> | |
| - | + | == References == | |
| - | [[Category: | + | <references/> |
| + | __TOC__ | ||
| + | </StructureSection> | ||
| + | [[Category: DNA nucleotidylexotransferase]] | ||
| + | [[Category: Delarue, M]] | ||
[[Category: Gouge, J]] | [[Category: Gouge, J]] | ||
| - | [[Category: | + | [[Category: Nucleus]] |
| + | [[Category: Terminal deoxynucleotidyltransferase]] | ||
| + | [[Category: Transferase-dna complex]] | ||
Revision as of 14:00, 10 June 2015
Mouse Tdt, F405A mutant, in complex with a DSB substrate, C-C base pair
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