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Inhibition of APOBEC3G activity impedes double-stranded DNA repair
Schiffer Lab Publications
  • Ponnandy Prabhu, The Hebrew University-Hadassah Medical School
  • Shivender Shandilya, University of Massachusetts Medical School
  • Elena Britan-Rosich, The Hebrew University-Hadassah Medical School
  • Adi Nagler, The Hebrew University-Hadassah Medical School
  • Celia A. Schiffer, University of Massachusetts Medical School
  • Moshe Kotler, The Hebrew University-Hadassah Medical School
UMMS Affiliation
Department of Biochemistry and Molecular Pharmacology
Publication Date
Document Type

The cellular cytidine deaminase APOBEC3G (A3G) was first described as an anti-HIV-1 restriction factor, acting by directly deaminating reverse transcripts of the viral genome. HIV-1 Vif neutralizes the activity of A3G, primarily by mediating degradation of A3G to establish effective infection in host target cells. Lymphoma cells, which express high amounts of A3G, can restrict Vif-deficient HIV-1. Interestingly, these cells are more stable in the face of treatments that result in double-stranded DNA damage, such as ionizing radiation and chemotherapies. Previously, we showed that the Vif-derived peptide (Vif25-39) efficiently inhibits A3G deamination, and increases the sensitivity of lymphoma cells to ionizing radiation. In the current study, we show that additional peptides derived from Vif, A3G, and APOBEC3F, which contain the LYYF motif, inhibit deamination activity. Each residue in the Vif25-39 sequence moderately contributes to the inhibitory effect, whereas replacing a single residue in the LYYF motif completely abrogates inhibition of deamination. Treatment of A3G-expressing lymphoma cells exposed to ionizing radiation with the new inhibitory peptides reduces double-strand break repair after irradiation. Incubation of cultured irradiated lymphoma cells with peptides that inhibit double-strand break repair halts their propagation. These results suggest that A3G may be a potential therapeutic target that is amenable to peptide and peptidomimetic inhibition.

  • DNA binding,
  • DNA repair,
  • lymphoma cells,
  • peptides
DOI of Published Version
FEBS J. 2016 Jan;283(1):112-29. doi: 10.1111/febs.13556. Epub 2015 Nov 6. Link to article on publisher's site
Related Resources
Link to Article in PubMed
PubMed ID
Citation Information
Ponnandy Prabhu, Shivender Shandilya, Elena Britan-Rosich, Adi Nagler, et al.. "Inhibition of APOBEC3G activity impedes double-stranded DNA repair" Vol. 283 Iss. 1 (2016) ISSN: 1742-464X (Linking)
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