Cited by 22DNA Repair MechanismsProtein Structure and DynamicsEnzyme Structure and Function

A new structural insight into XPA–DNA interactions

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Hilton, Benjamin, Shkriabai, Nick, Musich, Phillip R., Kvaratskhelia, Mamuka, Shell, Steven, Zou, Yue·2014·Bioscience Reports

Abstract

XPA (xeroderma pigmentosum group A) protein is an essential factor for NER (nucleotide excision repair) which is believed to be involved in DNA damage recognition/verification, NER factor recruiting and stabilization of repair intermediates. Past studies on the structure of XPA have focused primarily on XPA interaction with damaged DNA. However, how XPA interacts with other DNA structures remains unknown though recent evidence suggest that these structures could be important for its roles in both NER and non-NER activities. Previously, we reported that XPA recognizes undamaged DNA ds/ssDNA (double-strand/single-strandDNA) junctions with a binding affinity much higher than its ability to bind bulky DNA damage. To understand how this interaction occurs biochemically we implemented a structural determination of the interaction using a MS-based protein footprinting method and limited proteolysis. By monitoring surface accessibility of XPA lysines to NHS-biotin modification in the free protein and the DNA junction-bound complex we show that XPA physically interacts with the DNA junctions via two lysines, K168 and K179, located in the previously known XPA(98–219) DBD (DNA-binding domain). Importantly, we also uncovered new lysine residues, outside of the known DBD, involved in the binding. We found that residues K221, K222, K224 and K236 in the C-terminal domain are involved in DNA binding. Limited proteolysis analysis of XPA–DNA interactions further confirmed this observation. Structural modelling with these data suggests a clamp-like DBD for the XPA binding to ds/ssDNA junctions. Our results provide a novel structure-function view of XPA–DNA junction interactions.

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Authors
Hilton, B., Shkriabai, N., Musich, P. R., Kvaratskhelia, M., Shell, S., & Zou, Y.
Affiliations
  • East Tennessee State University (US)
  • The Ohio State University (US)
  • Vanderbilt University (US)
Corresponding author
  • Hilton, Benjamin
  • Zou, Yue
Venue
Bioscience Reports
Published
2014-12-01
Volume
34
Issue
6
Pages
e00162-e00162
ISSN
  • 0144-8463 (ISSN-L)
  • 1573-4935
OpenAlex
W2030896917
Cited by
22
References
44
Citations by year
2022: 1 · 2021: 2 · 2020: 2 · 2019: 2 · 2018: 3 · 2017: 8 · 2016: 3 · 2015: 1
FWCI
1.64
Type
journal article
Language
en
Open access
Locations
  • Bioscience Reports (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Digital Commons - East Tennessee State University (East Tennessee State University) (submittedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • National Cancer Institute (R01CA086927, CA-86927)
  • National Institute of Allergy and Infectious Diseases (R01AI062520)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
  • Physical Sciences › Materials Science › Materials Chemistry › Enzyme Structure and Function
Keywords
XPA, nucleotide excision repair, DNA junctions, DNA-binding domain, lysine residues, C-terminal domain, protein-DNA interactions, DNA damage recognition, protein structure-function relationship
MeSH terms
Base Sequence, Binding Sites, DNA, DNA-Binding Proteins, Humans, Lysine, Models, Molecular, Molecular Sequence Data, Nucleic Acid Conformation, Protein Binding, Protein Structure, Tertiary, Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization, Xeroderma Pigmentosum Group A Protein, Proteolysis

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