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Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
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The Multifaceted Roles of Ku70/80.

Sayma Zahid1, Murielle Seif El Dahan1, Florence Iehl1

  • 1Institute for Integrative Biology of the Cell (I2BC), Université Paris-Saclay, CEA, CNRS, 91198 Gif-sur-Yvette, France.

International Journal of Molecular Sciences
|April 30, 2021
PubMed
Summary

The Ku70/80 (Ku) protein complex is crucial for DNA double-strand break (DSB) repair via the classical nonhomologous end-joining (c-NHEJ) pathway. This review details Ku

Keywords:
DNA repair machineryc-NHEJdouble-strand breakprotein-DNA interactionstelomeres

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • DNA double-strand breaks (DSBs) are critical DNA lesions arising from endogenous/exogenous stress, programmed cellular events, or cancer treatments.
  • The classical nonhomologous end-joining (c-NHEJ) pathway is the primary mechanism for repairing DSBs in mammalian cells.
  • Understanding c-NHEJ is vital for radiobiology, cancer therapy, immune disorders, and genome editing applications.

Purpose of the Study:

  • To review the structural and functional characteristics of the Ku70/80 (Ku) heterodimer.
  • To elucidate Ku's role in recognizing and processing DNA and RNA.
  • To highlight Ku's involvement in DNA repair and telomere maintenance.

Main Methods:

  • Literature review of structural and functional data.
  • Analysis of Ku's DNA and RNA recognition properties.
  • Examination of Ku's role in c-NHEJ and other DNA metabolic processes.

Main Results:

  • Ku70/80 (Ku) is a central component of c-NHEJ, rapidly binding to DSBs and recruiting repair factors.
  • Ku's DNA and RNA binding capabilities are integral to its diverse functions.
  • Ku participates in DNA repair, telomere maintenance, and potentially other DNA metabolism pathways.

Conclusions:

  • The Ku heterodimer is a key regulator of DNA double-strand break repair through the c-NHEJ pathway.
  • Ku's ability to recognize both DNA and RNA underlies its multifaceted roles in cellular processes.
  • Further understanding of Ku's interactions is essential for advancing cancer therapy and genome editing technologies.