skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: An atypical BRCT–BRCT interaction with the XRCC1 scaffold protein compacts human DNA Ligase IIIα within a flexible DNA repair complex

Journal Article · · Nucleic Acids Research
DOI:https://doi.org/10.1093/nar/gkaa1188· OSTI ID:1766538

The XRCC1–DNA ligase IIIα complex (XL) is critical for DNA single-strand break repair, a key target for PARP inhibitors in cancer cells deficient in homologous recombination. Here, we combined biophysical approaches to gain insights into the shape and conformational flexibility of the XL as well as XRCC1 and DNA ligase IIIα (LigIIIα) alone. Structurally-guided mutational analyses based on the crystal structure of the human BRCT–BRCT heterodimer identified the network of salt bridges that together with the N-terminal extension of the XRCC1 C-terminal BRCT domain constitute the XL molecular interface. Coupling size exclusion chromatography with small angle X-ray scattering and multiangle light scattering (SEC-SAXS–MALS), we determined that the XL is more compact than either XRCC1 or LigIIIα, both of which form transient homodimers and are highly disordered. The reduced disorder and flexibility allowed us to build models of XL particles visualized by negative stain electron microscopy that predict close spatial organization between the LigIIIα catalytic core and both BRCT domains of XRCC1. Together our results identify an atypical BRCT–BRCT interaction as the stable nucleating core of the XL that links the flexible nick sensing and catalytic domains of LigIIIα to other protein partners of the flexible XRCC1 scaffold.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Institutes of Health (NIH); Cancer Prevention Research Institute of Texas (CPRIT); V Foundation; Natural Sciences and Engineering Research Council of Canada (NSERC)
Grant/Contract Number:
AC02-05CH11231; R01 ES012512; R35 CA220430; P01 CA092584; P30 GM124169- 01 ALS-ENABLE; RP180813; V2018-25; RGPIN-2015-05776
OSTI ID:
1766538
Journal Information:
Nucleic Acids Research, Vol. 49, Issue 1; ISSN 0305-1048
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United States
Language:
English

References (77)

Efficient Single-Strand Break Repair Requires Binding to Both Poly(ADP-Ribose) and DNA by the Central BRCT Domain of XRCC1 journal January 2019
Accelerated cryo-EM structure determination with parallelisation using GPUs in RELION-2 journal November 2016
The structural basis for partitioning of the XRCC1/DNA ligase III-α BRCT-mediated dimer complexes journal June 2011
DNA Ligase III Promotes Alternative Nonhomologous End-Joining during Chromosomal Translocation Formation journal June 2011
RsrA, an anti-sigma factor regulated by redox change journal August 1999
Spatial and Temporal Cellular Responses to Single-Strand Breaks in Human Cells journal June 2003
DNA Ligase III Is Recruited to DNA Strand Breaks by a Zinc Finger Motif Homologous to That of Poly(ADP-ribose) Polymerase: IDENTIFICATION OF TWO FUNCTIONALLY DISTINCT DNA BINDING REGIONS WITHIN DNA LIGASE III journal July 1999
Role of a BRCT domain in the interaction of DNA ligase III-α with the DNA repair protein XRCC1 journal July 1998
NEIL2-initiated, APE-independent repair of oxidized bases in DNA: Evidence for a repair complex in human cells journal December 2006
Structural basis for AcrVA4 inhibition of specific CRISPR-Cas12a journal August 2019
Mechanism of DNA substrate recognition by the mammalian DNA repair enzyme, Polynucleotide Kinase journal August 2009
Domain specific interaction in the XRCC1-DNA polymerase beta complex journal May 2000
Two DNA-binding and Nick Recognition Modules in Human DNA Ligase III journal April 2008
Physical and Functional Interaction between DNA Ligase IIIα and Poly(ADP-Ribose) Polymerase 1 in DNA Single-Strand Break Repair journal August 2003
Solution Structure and DNA Binding of the Zinc-finger Domain from DNA Ligase IIIα journal August 2004
A novel human AP endonuclease with conserved zinc-finger-like motifs involved in DNA strand break responses journal March 2007
CHIP-Mediated Degradation and DNA Damage-Dependent Stabilization Regulate Base Excision Repair Proteins journal February 2008
Prevention of overfitting in cryo-EM structure determination journal July 2012
APLF (C2orf13) Is a Novel Human Protein Involved in the Cellular Response to Chromosomal DNA Strand Breaks journal March 2007
Local analysis of strains and rotations for macromolecular electron microscopy maps journal July 2016
Single-strand break repair and genetic disease journal August 2008
Crucial role for DNA ligase III in mitochondria but not in Xrcc1-dependent repair journal March 2011
Role of XRCC1 in the Coordination and Stimulation of Oxidative DNA Damage Repair Initiated by the DNA Glycosylase hOGG1 journal November 2003
DNA-bound structures and mutants reveal abasic DNA binding by APE1 DNA repair and coordination journal January 2000
Accurate SAXS Profile Computation and its Assessment by Contrast Variation Experiments journal August 2013
X-ray solution scattering (SAXS) combined with crystallography and computation: defining accurate macromolecular structures, conformations and assemblies in solution journal August 2007
FoXS, FoXSDock and MultiFoXS: Single-state and multi-state structural modeling of proteins and their complexes based on SAXS profiles journal May 2016
Human DNA ligase III bridges two DNA ends to promote specific intermolecular DNA end joining journal June 2015
Atomic Structures of the Human Immunophilin FKBP-12 Complexes with FK506 and Rapamycin journal January 1993
Human DNA ligases I and III, but not ligase IV, are required for microhomology-mediated end joining of DNA double-strand breaks journal April 2008
UCSF Chimera?A visualization system for exploratory research and analysis journal January 2004
Robust, high-throughput solution structural analyses by small angle X-ray scattering (SAXS) journal July 2009
AP Endonuclease-Independent DNA Base Excision Repair in Human Cells journal July 2004
The Electron Microscopy eXchange (EMX) initiative journal May 2016
The neurodegenerative disease protein aprataxin resolves abortive DNA ligation intermediates journal September 2006
Mutation of a BRCT domain selectively disrupts DNA single-strand break repair in noncycling Chinese hamster ovary cells journal November 2000
Two Pathways for Base Excision Repair in Mammalian Cells journal April 1996
Comparative Protein Modelling by Satisfaction of Spatial Restraints journal December 1993
An alternative splicing event which occurs in mouse pachytene spermatocytes generates a form of DNA ligase III with distinct biochemical properties that may function in meiotic recombination. journal February 1997
Mitochondrial DNA ligase III function is independent of Xrcc1 journal October 2000
Implementation and performance of SIBYLS: a dual endstation small-angle X-ray scattering and macromolecular crystallography beamline at the Advanced Light Source journal January 2013
Molecular cloning of the human XRCC1 gene, which corrects defective DNA strand break repair and sister chromatid exchange. journal December 1990
An interaction between the mammalian DNA repair protein XRCC1 and DNA ligase III. journal January 1994
XRCC1 Polypeptide Interacts with DNA Polymerase   and Possibly Poly (ADP-Ribose) Polymerase, and DNA Ligase III Is a Novel Molecular 'Nick-Sensor' In Vitro journal November 1996
Mutations in PNKP cause microcephaly, seizures and defects in DNA repair journal January 2010
SUMOylation coordinates BERosome assembly in active DNA demethylation during cell differentiation journal December 2018
In situ analysis of repair processes for oxidative DNA damage in mammalian cells journal September 2004
Evolving SAXS versatility: solution X-ray scattering for macromolecular architecture, functional landscapes, and integrative structural biology journal October 2019
High-Throughput SAXS for the Characterization of Biomolecules in Solution: A Practical Approach book October 2013
Sealing of Chromosomal DNA Nicks during Nucleotide Excision Repair Requires XRCC1 and DNA Ligase IIIα in a Cell-Cycle-Specific Manner journal July 2007
Reconstitution of DNA base excision-repair with purified human proteins: interaction between DNA polymerase beta and the XRCC1 protein. journal December 1996
FoXS: a web server for rapid computation and fitting of SAXS profiles journal May 2010
XRCC1 promotes replication restart, nascent fork degradation and mutagenic DNA repair in BRCA2-deficient cells journal August 2020
RELION: Implementation of a Bayesian approach to cryo-EM structure determination journal December 2012
DNA ligase III is critical for mtDNA integrity but not Xrcc1-mediated nuclear DNA repair journal March 2011
XRCC1 mutation is associated with PARP1 hyperactivation and cerebellar ataxia journal December 2016
The Human DNA Ligase III Gene Encodes Nuclear and Mitochondrial Proteins journal May 1999
Direct interaction between XRCC1 and UNG2 facilitates rapid repair of uracil in DNA by XRCC1 complexes journal July 2010
Characterization of the XRCC1-DNA ligase III complex in vitro and its absence from mutant hamster cells journal January 1995
The FHA domain of aprataxin interacts with the C-terminal region of XRCC1 journal December 2004
Structure of an XRCC1 BRCT domain: a new protein-protein interaction module journal November 1998
Characterizing flexible and intrinsically unstructured biological macromolecules by SAS using the Porod-Debye law journal April 2011
XRCC1 phosphorylation by CK2 is required for its stability and efficient DNA repair journal July 2010
Structure and flexibility within proteins as identified through small angle X-ray scattering journal January 2009
Automated electron microscope tomography using robust prediction of specimen movements journal October 2005
Biophysical Characterization of Human XRCC1 and Its Binding to Damaged and Undamaged DNA journal December 2004
Accurate assessment of mass, models and resolution by small-angle scattering journal April 2013
cryoSPARC: algorithms for rapid unsupervised cryo-EM structure determination journal February 2017
Human Mre11/Human Rad50/Nbs1 and DNA Ligase IIIα/XRCC1 Protein Complexes Act Together in an Alternative Nonhomologous End Joining Pathway journal August 2011
XRCC1 coordinates the initial and late stages of DNA abasic site repair through protein-protein interactions journal November 2001
Disconnecting XRCC1 and DNA ligase III journal July 2011
A Flexible Interface between DNA Ligase and PCNA Supports Conformational Switching and Efficient Ligation of DNA journal October 2006
A New XRCC1-Containing Complex and Its Role in Cellular Survival of Methyl Methanesulfonate Treatment journal October 2004
Human DNA Ligase III Recognizes DNA Ends by Dynamic Switching between Two DNA-Bound States journal July 2010
XRCC1 interactions with multiple DNA glycosylases: A model for its recruitment to base excision repair journal July 2005
XRCC1 protein; Form and function journal September 2019
Bridging the solution divide: comprehensive structural analyses of dynamic RNA, DNA, and protein assemblies by small-angle X-ray scattering journal February 2010