6P0D

Human DNA Ligase 1 (E346A/E592A) Bound to an Adenylated, hydroxyl terminated DNA nick


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.179 
  • R-Value Work: 0.160 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Two-tiered enforcement of high-fidelity DNA ligation.

Tumbale, P.P.Jurkiw, T.J.Schellenberg, M.J.Riccio, A.A.O'Brien, P.J.Williams, R.S.

(2019) Nat Commun 10: 5431-5431

  • DOI: 10.1038/s41467-019-13478-7
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • 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 ...

    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.


    Organizational Affiliation

    Biological Chemistry, University of Michigan, 1150 W Medical Center Drive Ann Arbor, Ann Arbor, MI, 48109, USA. pjobrien@umich.edu.,Genome Integrity and Structural Biology Laboratory, National Institute of Environmental Health Sciences, US National Institutes of Health, Department of Health and Human Services, 111 TW Alexander Drive, Research Triangle Park, NC, 27709, USA. williamsrs@niehs.nih.gov.,Biological Chemistry, University of Michigan, 1150 W Medical Center Drive Ann Arbor, Ann Arbor, MI, 48109, USA.,Genome Integrity and Structural Biology Laboratory, National Institute of Environmental Health Sciences, US National Institutes of Health, Department of Health and Human Services, 111 TW Alexander Drive, Research Triangle Park, NC, 27709, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DNA ligase 1
A
645Homo sapiensMutation(s): 2 
Gene Names: LIG1
EC: 6.5.1.1
Find proteins for P18858 (Homo sapiens)
Go to Gene View: LIG1
Go to UniProtKB:  P18858
Entity ID: 2
MoleculeChainsLengthOrganism
DNA (5'-D(*GP*CP*TP*GP*AP*TP*GP*CP*GP*TP*C)-3')B11synthetic construct
Entity ID: 3
MoleculeChainsLengthOrganism
DNA (5'-D(P*GP*TP*CP*GP*GP*AP*C)-3')C7synthetic construct
Entity ID: 4
MoleculeChainsLengthOrganism
DNA (5'-D(*GP*TP*CP*CP*GP*AP*CP*GP*AP*CP*GP*CP*AP*TP*CP*AP*GP*C)-3')D18synthetic construct
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
AMP
Query on AMP

Download SDF File 
Download CCD File 
C
ADENOSINE MONOPHOSPHATE
C10 H14 N5 O7 P
UDMBCSSLTHHNCD-KQYNXXCUSA-N
 Ligand Interaction
PEG
Query on PEG

Download SDF File 
Download CCD File 
A
DI(HYDROXYETHYL)ETHER
C4 H10 O3
MTHSVFCYNBDYFN-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.179 
  • R-Value Work: 0.160 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 71.793α = 90.00
b = 101.227β = 90.00
c = 115.368γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
PHENIXrefinement
HKL-2000data reduction
PDB_EXTRACTdata extraction
PHENIXphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of Environmental Health Sciences (NIH/NIEHS)United States1Z01ES102765

Revision History 

  • Version 1.0: 2019-12-11
    Type: Initial release