Cited by 288DNA Repair MechanismsGenetic factors in colorectal cancerDNA and Nucleic Acid Chemistry

ATR Kinase Activation Mediated by MutSα and MutLα in Response to Cytotoxic O6-Methylguanine Adducts

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Yoshioka, Ken-ichi, Yoshioka, Yoshiko, Hsieh, Peggy·2006·Molecular Cell

Abstract

S(N)1-type alkylating agents that produce cytotoxic O(6)-methyl-G (O(6)-meG) DNA adducts induce cell cycle arrest and apoptosis in a manner requiring the DNA mismatch repair (MMR) proteins MutSalpha and MutLalpha. Here, we show that checkpoint signaling in response to DNA methylation occurs during S phase and requires DNA replication that gives rise to O(6)-meG/T mispairs. DNA binding studies reveal that MutSalpha specifically recognizes O(6)-meG/T mispairs, but not O(6)-meG/C. In an in vitro assay, ATR-ATRIP, but not RPA, is preferentially recruited to O(6)-meG/T mismatches in a MutSalpha- and MutLalpha-dependent manner. Furthermore, ATR kinase is activated to phosphorylate Chk1 in the presence of O(6)-meG/T mispairs and MMR proteins. These results suggest that MMR proteins can act as direct sensors of methylation damage and help recruit ATR-ATRIP to sites of cytotoxic O(6)-meG adducts to initiate ATR checkpoint signaling.

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Crossref · 10.1016/j.molcel.2006.04.023

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  1. Duckett, D.R., Bronstein, S.M., Taya, Y., and Modrich, P. (1999). hMutSa-and hMutLa-dependent phosphorylation of p53 in re- sponse to DNA methylator damage. Proc. Natl. Acad. Sci. USA 96, 12384-12388.

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Authors
Yoshioka, K.-I., Yoshioka, Y., & Hsieh, P.
Affiliations
National Institutes of Health (US)
Corresponding author
Hsieh, Peggy
Venue
Molecular Cell
Publisher
Elsevier BV
Published
2006-05
Volume
22
Issue
4
Pages
501-510
ISSN
1097-2765 (ISSN-L)
OpenAlex
W2163529853
Cited by
288
References
49
Citations by year
2026: 7 · 2025: 4 · 2024: 12 · 2023: 4 · 2022: 14 · 2021: 15 · 2020: 8 · 2019: 9 · 2018: 6 · 2017: 7 · 2016: 13 · 2015: 15 · 2014: 9 · 2013: 15 · 2012: 13
FWCI
11.68
Type
journal article
Language
en
Open access
Locations
  • Molecular Cell (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • Massachusetts General Hospital
  • National Institutes of Health
  • National Institute of Diabetes and Digestive and Kidney Diseases (Z01DK052029)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Genetic factors in colorectal cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA and Nucleic Acid Chemistry
Keywords
MutSα, MutLα, DNA mismatch repair, DNA replication checkpoint, S phase, Chk1 phosphorylation, DNA damage recognition
MeSH terms
Animals, Base Sequence, Carrier Proteins, Cell Line, DNA, DNA Damage, DNA Repair, DNA-Binding Proteins, Enzyme Activation, Exodeoxyribonucleases, Guanine, HeLa Cells, Humans, Nuclear Proteins, Phosphoproteins, Signal Transduction, S Phase, Protein Serine-Threonine Kinases, DNA Adducts, Cell Cycle Proteins, Base Pair Mismatch, Adaptor Proteins, Signal Transducing, Mice, MutS DNA Mismatch-Binding Protein, Ataxia Telangiectasia Mutated Proteins

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