6p0c: Difference between revisions
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==Human DNA Ligase 1 Bound to an Adenylated, hydroxyl terminated DNA nick in EDTA== | |||
<StructureSection load='6p0c' size='340' side='right'caption='[[6p0c]], [[Resolution|resolution]] 1.55Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[6p0c]] is a 4 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6P0C OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6P0C FirstGlance]. <br> | |||
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=AMP:ADENOSINE+MONOPHOSPHATE'>AMP</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=PEG:DI(HYDROXYETHYL)ETHER'>PEG</scene></td></tr> | |||
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/DNA_ligase_(ATP) DNA ligase (ATP)], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=6.5.1.1 6.5.1.1] </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=6p0c FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6p0c OCA], [http://pdbe.org/6p0c PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6p0c RCSB], [http://www.ebi.ac.uk/pdbsum/6p0c PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6p0c ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[[http://www.uniprot.org/uniprot/DNLI1_HUMAN DNLI1_HUMAN]] DNA ligase that seals nicks in double-stranded DNA during DNA replication, DNA recombination and DNA repair. | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
DNA ligases catalyze the joining of DNA strands to complete DNA replication, recombination and repair transactions. To protect the integrity of the genome, DNA ligase 1 (LIG1) discriminates against DNA junctions harboring mutagenic 3'-DNA mismatches or oxidative DNA damage, but how such high-fidelity ligation is enforced is unknown. Here, X-ray structures and kinetic analyses of LIG1 complexes with undamaged and oxidatively damaged DNA unveil that LIG1 employs Mg(2+)-reinforced DNA binding to validate DNA base pairing during the adenylyl transfer and nick-sealing ligation reaction steps. Our results support a model whereby LIG1 fidelity is governed by a high-fidelity (HiFi) interface between LIG1, Mg(2+), and the DNA substrate that tunes the enzyme to release pro-mutagenic DNA nicks. In a second tier of protection, LIG1 activity is surveilled by Aprataxin (APTX), which suppresses mutagenic and abortive ligation at sites of oxidative DNA damage. | |||
Two-tiered enforcement of high-fidelity DNA ligation.,Tumbale PP, Jurkiw TJ, Schellenberg MJ, Riccio AA, O'Brien PJ, Williams RS Nat Commun. 2019 Nov 28;10(1):5431. doi: 10.1038/s41467-019-13478-7. PMID:31780661<ref>PMID:31780661</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
[[Category: | </div> | ||
<div class="pdbe-citations 6p0c" style="background-color:#fffaf0;"></div> | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Large Structures]] | |||
[[Category: Riccio, A A]] | |||
[[Category: Schellenberg, M J]] | |||
[[Category: Tumbale, P S]] | |||
[[Category: Williams, R S]] | |||
[[Category: Adenylation domain]] | |||
[[Category: Dna binding domain]] | |||
[[Category: Ligase]] | |||
[[Category: Ligase-dna complex]] | |||
[[Category: Metalloenzyme]] | |||
[[Category: Ob fold]] | |||
[[Category: Phosphotransferase]] | |||
[[Category: Protein-dna complex]] | |||
Revision as of 18:10, 11 December 2019
Human DNA Ligase 1 Bound to an Adenylated, hydroxyl terminated DNA nick in EDTAHuman DNA Ligase 1 Bound to an Adenylated, hydroxyl terminated DNA nick in EDTA
Structural highlights
Function[DNLI1_HUMAN] DNA ligase that seals nicks in double-stranded DNA during DNA replication, DNA recombination and DNA repair. Publication Abstract from PubMedDNA ligases catalyze the joining of DNA strands to complete DNA replication, recombination and repair transactions. To protect the integrity of the genome, DNA ligase 1 (LIG1) discriminates against DNA junctions harboring mutagenic 3'-DNA mismatches or oxidative DNA damage, but how such high-fidelity ligation is enforced is unknown. Here, X-ray structures and kinetic analyses of LIG1 complexes with undamaged and oxidatively damaged DNA unveil that LIG1 employs Mg(2+)-reinforced DNA binding to validate DNA base pairing during the adenylyl transfer and nick-sealing ligation reaction steps. Our results support a model whereby LIG1 fidelity is governed by a high-fidelity (HiFi) interface between LIG1, Mg(2+), and the DNA substrate that tunes the enzyme to release pro-mutagenic DNA nicks. In a second tier of protection, LIG1 activity is surveilled by Aprataxin (APTX), which suppresses mutagenic and abortive ligation at sites of oxidative DNA damage. Two-tiered enforcement of high-fidelity DNA ligation.,Tumbale PP, Jurkiw TJ, Schellenberg MJ, Riccio AA, O'Brien PJ, Williams RS Nat Commun. 2019 Nov 28;10(1):5431. doi: 10.1038/s41467-019-13478-7. PMID:31780661[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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