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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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RanBP2-Mediated SUMOylation Promotes Human DNA Polymerase Lambda Nuclear Localization and DNA Repair.

M Moreno-Oñate1, A M Herrero-Ruiz2, M García-Dominguez2

  • 1Departamento Bioquímica Vegetal y Biología Molecular, Universidad de Sevilla, 41012 Sevilla.

Journal of Molecular Biology
|April 1, 2020
PubMed
Summary
This summary is machine-generated.

Human DNA polymerase lambda (Polλ) is modified by Small Ubiquitin-like MOdifier (SUMO) proteins, a process crucial for its nuclear entry and DNA repair functions.

Keywords:
DNA polymerase lambdaDNA repairSUMOylationpost-translational modifications

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Cellular DNA is constantly damaged by endogenous and exogenous agents.
  • Human cells possess numerous DNA repair factors to counteract damage.
  • DNA polymerase lambda (Polλ) is a versatile factor involved in DNA repair and damage tolerance pathways requiring gap-filling synthesis.

Purpose of the Study:

  • To investigate the post-translational modification of human DNA polymerase lambda (Polλ).
  • To elucidate the role of SUMOylation in Polλ's cellular localization and function.
  • To identify the specific site and mechanism of Polλ SUMOylation.

Main Methods:

  • In vitro and in vivo conjugation assays to detect SUMOylation of Polλ.
  • Identification of the target lysine residue (Lys27) for SUMOylation.
  • Investigation of the role of the nuclear pore complex and RanBP2 in Polλ SUMOylation.
  • Analysis of Polλ nuclear import and recruitment to DNA lesions following SUMOylation.

Main Results:

  • Human Polλ undergoes conjugation with Small Ubiquitin-like MOdifier (SUMO) proteins.
  • Lysine 27 (Lys27) is identified as the primary site for Polλ SUMOylation.
  • Polλ SUMOylation occurs at the nuclear pore complex, mediated by the E3 ligase RanBP2.
  • SUMOylation promotes Polλ nuclear entry, enhancing its recruitment to DNA lesions, particularly upon DNA damage induction.

Conclusions:

  • SUMOylation is a critical post-translational modification regulating human Polλ's cellular localization.
  • This modification facilitates Polλ's entry into the nucleus, enabling its function in nuclear DNA repair.
  • The findings provide insights into molecular pathways controlling Polλ activity and may offer targets for therapeutic modulation.