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In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
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Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
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The stepwise destruction of specific proteins is necessary for the progression and completion of the cell cycle. Such proteins are ubiquitinated by ubiquitin ligases and then subsequently destroyed by the proteasome. The SCF (Skp1/Cullin/F-box) and the anaphase-promoting complex (APC) are two important ubiquitin ligases involved in cell cycle progression. While SCF is active throughout the cell cycle, APC gets activated during metaphase to anaphase transition. Cdc20 or Cdh1 binds to APC and...
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Related Experiment Video

Updated: May 1, 2026

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Parc: a cytoplasmic anchor for p53.

Anatoly Y Nikolaev1, Muyang Li, Norbert Puskas

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Parkin-like ubiquitin ligase (Parc) anchors the tumor suppressor p53 in the cytoplasm. Parc inactivation promotes p53 nuclear entry, activating apoptosis and enhancing DNA damage response in neuroblastoma.

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Area of Science:

  • Cellular Biology
  • Molecular Oncology
  • Protein Biochemistry

Background:

  • Nuclear localization of p53 is crucial for its tumor suppressor activity.
  • Understanding the mechanisms regulating p53 subcellular localization is key to cancer research.
  • Cytoplasmic sequestration of p53 can impair its tumor-suppressive functions.

Purpose of the Study:

  • To identify proteins that regulate the cytoplasmic localization of p53.
  • To elucidate the role of Parc in controlling p53 subcellular distribution and function.
  • To investigate the therapeutic potential of targeting the p53-Parc interaction in cancer.

Main Methods:

  • Co-immunoprecipitation assays to detect p53-Parc interaction.
  • Immunofluorescence microscopy to visualize p53 subcellular localization.
  • RNA interference (RNAi) to reduce Parc expression.
  • Apoptosis assays and DNA damage response assessments in neuroblastoma cells.

Main Results:

  • Parc directly interacts with p53, forming a large cytoplasmic complex (~1 MDa) in unstressed cells.
  • Inactivation of Parc leads to nuclear translocation of p53 and induction of apoptosis.
  • Overexpression of Parc causes cytoplasmic sequestration of p53.
  • Reduced Parc levels sensitize neuroblastoma cells to DNA damage, correlating with abnormal p53 localization.

Conclusions:

  • Parc acts as a critical cytoplasmic anchor for p53, regulating its nuclear entry.
  • Parc is a key determinant of p53 subcellular localization and subsequent tumor suppressor activity.
  • Targeting Parc may represent a novel therapeutic strategy for cancers with abnormal p53 localization, such as neuroblastoma.