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Related Concept Videos

Intrinsically Disordered Proteins02:18

Intrinsically Disordered Proteins

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Intrinsically disordered proteins are a group of proteins that do not fold into specific three-dimensional structures. Their structural flexibility allows them to complement ordered proteins to perform functions that are inaccessible to rigid structures. They are more common in eukaryotes than prokaryotes and may either be exclusively intrinsically disordered or hybrid proteins, consisting of a mix of ordered and disordered regions. The absence of a rigid structure in these proteins can be...
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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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Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
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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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Related Experiment Video

Updated: Jun 6, 2025

Purification of Ubiquitinated p53 Proteins from Mammalian Cells
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Purification of Ubiquitinated p53 Proteins from Mammalian Cells

Published on: March 21, 2022

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How does p53 work? Regulation by the intrinsically disordered domains.

H Jane Dyson1, Peter E Wright1

  • 1Department of Integrative Structural and Computational Biology, Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.

Trends in Biochemical Sciences
|November 22, 2024
PubMed
Summary

Tumor suppressor p53 protein defects are common in cancer. Our model shows disordered regions, not just the DNA-binding domain, are key to p53 regulation and activation.

Keywords:
DNA bindingDNA damageintrinsically disordered domainspost-translational modificationstranscription factor

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Area of Science:

  • Molecular Biology
  • Cancer Research
  • Protein Dynamics

Background:

  • Defects in the tumor suppressor protein p53 are implicated in most human cancers.
  • Research has primarily focused on the DNA-binding domain (DBD) due to frequent cancer mutations within it.
  • The intrinsically disordered N-terminal activation domain (NTAD) and C-terminal regulatory domain (CTD) are increasingly recognized for their regulatory roles.

Purpose of the Study:

  • To propose a mechanistic model for p53 regulation and activation.
  • To highlight the role of intrinsically disordered regions (IDRs) in p53 function.
  • To investigate the interplay between disordered regions and the DNA-binding domain.

Main Methods:

  • Mechanistic modeling of protein interactions.
  • Analysis of intermolecular and intramolecular interactions within p53.
  • Consideration of post-translational modifications (PTMs) in p53 regulation.

Main Results:

  • Intrinsically disordered regions (NTAD and CTD) play a synergistic role with the DBD in p53 regulation.
  • Interactions within and between disordered regions are crucial for p53 activity.
  • Post-translational modifications modulate the interactions of disordered regions, impacting p53 function.

Conclusions:

  • A mechanistic model emphasizing the critical role of disordered regions in p53 regulation and activation is proposed.
  • The study shifts focus from solely the DBD to the integrated function of p53 domains, including IDRs.
  • Understanding the dynamics of disordered regions and PTMs offers new avenues for cancer therapy targeting p53.