Cited by 33DNA Repair MechanismsCancer-related Molecular PathwaysDNA and Nucleic Acid Chemistry

Stimulation of human DNA polymerase epsilon by MDM2

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Asahara, H.·2003·Nucleic Acids Research

Abstract

The human DNA polymerase epsilon catalytic subunit consists of a 140-kDa N-terminal domain that contains the catalytic activity and a 120-kDa C-terminal domain that binds to the other subunits and to exogenous peptides, including PCNA and MDM2. We report here that recombinant human MDM2 purified from insect cells or Escherichia coli stimulated the activity of DNA polymerase epsilon up to 10- and 40-fold, respectively, but not those of DNA polymerase beta or Klenow fragment of E.coli DNA polymerase I. Kinetic studies indicated that MDM2 increased the maximum velocity of the reaction, but did not change substrate affinities. The stimulation depended upon the interaction of the N-terminal 166 amino acid residues of MDM2 with the C-terminal domain of the full-length catalytic subunit, since the deletion of 166 amino acids from N-terminal of MDM2 or the removal of the C-terminal domain of DNA polymerase epsilon by trypsin digestion or competition for binding to it by the addition of excess C-terminal fragment eliminated the stimulation. Since DNA polymerase epsilon appears to be involved in DNA replication, recombination and repair synthesis, we suggest that MDM2 binding to DNA polymerase epsilon might be part of a reconfiguration process that allows DNA polymerase epsilon to associate with repair/recombination proteins in response to DNA damage.

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Authors
Asahara, H.
Affiliations
University of California, Berkeley (US)
Corresponding author
Asahara, H.
Venue
Nucleic Acids Research
Published
2003-05-01
Volume
31
Issue
9
Pages
2451-2459
ISSN
  • 0305-1048 (ISSN-L)
  • 1362-4962
OpenAlex
W1945473077
Cited by
33
References
52
Citations by year
2023: 1 · 2022: 1 · 2021: 1 · 2020: 1 · 2017: 1 · 2015: 1 · 2014: 3 · 2013: 2 · 2012: 5
FWCI
1.15
Type
journal article
Language
en
Open access
Locations
  • Nucleic Acids Research (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (5r01gm030415-17, 5r29ca070165-06)
  • Directorate for Biological Sciences
  • Biotechnology and Biological Sciences Research Council
  • National Cancer Institute (1R29CA70165)
  • National Institute of General Medical Sciences (1R01GM30415, R01GM059424, 1R01 GM 59424)
  • National Institute of Environmental Health Sciences (P30-ES08196)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA and Nucleic Acid Chemistry
Keywords
DNA polymerase epsilon, MDM2, enzyme activation, catalytic subunit, C-terminal domain, N-terminal domain, PCNA, DNA replication, DNA repair, recombination, DNA damage response, protein-protein interaction, polymerase kinetics
MeSH terms
Animals, Cell Line, DNA Polymerase II, Enzyme Activation, HeLa Cells, Humans, Kinetics, Nuclear Proteins, Peptide Fragments, Protein Binding, Proto-Oncogene Proteins, Recombinant Proteins, Substrate Specificity, Spodoptera, Proto-Oncogene Proteins c-mdm2

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