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| | ==Mouse Tdt in complex with a DSB substrate, C-A base pair== | | ==Mouse Tdt in complex with a DSB substrate, C-A base pair== |
| - | <StructureSection load='4qz9' size='340' side='right' caption='[[4qz9]], [[Resolution|resolution]] 2.05Å' scene=''> | + | <StructureSection load='4qz9' size='340' side='right'caption='[[4qz9]], [[Resolution|resolution]] 2.05Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[4qz9]] is a 4 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=4QZ9 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4QZ9 FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[4qz9]] is a 4 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=4QZ9 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4QZ9 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> | + | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><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]], [[4qza|4qza]], [[4qzb|4qzb]], [[4qzc|4qzc]], [[4qzd|4qzd]], [[4qze|4qze]], [[4qzf|4qzf]], [[4qzg|4qzg]], [[4qzh|4qzh]], [[4qzi|4qzi]]</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=4qz9 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4qz9 OCA], [https://pdbe.org/4qz9 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4qz9 RCSB], [https://www.ebi.ac.uk/pdbsum/4qz9 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4qz9 ProSAT]</span></td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">Dntt, Tdt ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=10090 LK3 transgenic mice])</td></tr>
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| - | <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=4qz9 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4qz9 OCA], [http://pdbe.org/4qz9 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4qz9 RCSB], [http://www.ebi.ac.uk/pdbsum/4qz9 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4qz9 ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | == Function == | | == 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. | + | [https://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;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: DNA nucleotidylexotransferase]] | + | [[Category: Large Structures]] |
| - | [[Category: Lk3 transgenic mice]] | + | [[Category: Mus musculus]] |
| - | [[Category: Delarue, M]] | + | [[Category: Delarue M]] |
| - | [[Category: Gouge, J]] | + | [[Category: Gouge J]] |
| - | [[Category: Nucleus]]
| + | |
| - | [[Category: Terminal deoxynucleotidyltransferase]]
| + | |
| - | [[Category: Transferase-dna complex]]
| + | |
| Structural highlights
Function
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.
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[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Gouge J, Rosario S, Romain F, Poitevin F, Beguin P, Delarue M. Structural basis for a novel mechanism of DNA bridging and alignment in eukaryotic DSB DNA repair. EMBO J. 2015 Apr 15;34(8):1126-42. doi: 10.15252/embj.201489643. Epub 2015 Mar, 11. PMID:25762590 doi:http://dx.doi.org/10.15252/embj.201489643
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