6BKF

Lysyl-adenylate form of human LigIV catalytic domain with bound DNA substrate in open conformation


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.25 Å
  • R-Value Free: 0.316 
  • R-Value Work: 0.264 
  • R-Value Observed: 0.266 

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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

Structures of DNA-bound human ligase IV catalytic core reveal insights into substrate binding and catalysis.

Kaminski, A.M.Tumbale, P.P.Schellenberg, M.J.Williams, R.S.Williams, J.G.Kunkel, T.A.Pedersen, L.C.Bebenek, K.

(2018) Nat Commun 9: 2642-2642

  • DOI: 10.1038/s41467-018-05024-8
  • Primary Citation of Related Structures:  
    6BKF, 6BKG

  • PubMed Abstract: 
  • DNA ligase IV (LigIV) performs the final DNA nick-sealing step of classical nonhomologous end-joining, which is critical for immunoglobulin gene maturation and efficient repair of genotoxic DNA double-strand breaks. Hypomorphic LigIV mutations cause extreme radiation sensitivity and immunodeficiency in humans ...

    DNA ligase IV (LigIV) performs the final DNA nick-sealing step of classical nonhomologous end-joining, which is critical for immunoglobulin gene maturation and efficient repair of genotoxic DNA double-strand breaks. Hypomorphic LigIV mutations cause extreme radiation sensitivity and immunodeficiency in humans. To better understand the unique features of LigIV function, here we report the crystal structure of the catalytic core of human LigIV in complex with a nicked nucleic acid substrate in two distinct states-an open lysyl-AMP intermediate, and a closed DNA-adenylate form. Results from structural and mutagenesis experiments unveil a dynamic LigIV DNA encirclement mechanism characterized by extensive interdomain interactions and active site phosphoanhydride coordination, all of which are required for efficient DNA nick sealing. These studies provide a scaffold for defining impacts of LigIV catalytic core mutations and deficiencies in human LIG4 syndrome.


    Organizational Affiliation

    Genome Integrity and Structural Biology Laboratory, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, 27709, NC, USA.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DNA ligase 4A621Homo sapiensMutation(s): 0 
Gene Names: LIG4
EC: 6.5.1.1
UniProt & NIH Common Fund Data Resources
Find proteins for P49917 (Homo sapiens)
Explore P49917 
Go to UniProtKB:  P49917
PHAROS:  P49917
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP49917
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsLengthOrganismImage
DNA (5'-D(*GP*CP*TP*GP*AP*TP*GP*CP*GP*TP*C)-3')B [auth P]11synthetic construct
Protein Feature View
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  • Reference Sequence

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Entity ID: 3
MoleculeChainsLengthOrganismImage
DNA (5'-D(*GP*TP*CP*CP*GP*AP*CP*GP*AP*CP*GP*CP*AP*TP*CP*AP*GP*C)-3')C [auth T]18synthetic construct
Protein Feature View
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  • Reference Sequence

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Entity ID: 4
MoleculeChainsLengthOrganismImage
DNA (5'-D(P*GP*TP*CP*GP*GP*AP*C)-3')D7synthetic construct
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
AMP
Query on AMP

Download Ideal Coordinates CCD File 
E [auth A]ADENOSINE MONOPHOSPHATE
C10 H14 N5 O7 P
UDMBCSSLTHHNCD-KQYNXXCUSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.25 Å
  • R-Value Free: 0.316 
  • R-Value Work: 0.264 
  • R-Value Observed: 0.266 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 119.22α = 90
b = 119.22β = 90
c = 137.414γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of Environmental Health Sciences (NIH/NIEHS)United States1ZIA ES 102645
National Institutes of Health/National Institute of Environmental Health Sciences (NIH/NIEHS)United StatesZ01 ES065070
National Institutes of Health/National Institute of Environmental Health Sciences (NIH/NIEHS)United States1Z01 ES102765
National Institutes of Health/National Institute of Environmental Health Sciences (NIH/NIEHS)United StatesZES102488-09

Revision History  (Full details and data files)

  • Version 1.0: 2018-07-18
    Type: Initial release
  • Version 1.1: 2019-02-20
    Changes: Author supporting evidence, Data collection
  • Version 1.2: 2019-12-18
    Changes: Author supporting evidence