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Telomeres and Telomerase02:41

Telomeres and Telomerase

In eukaryotic DNA replication, a single-stranded DNA fragment remains at the end of a chromosome after the removal of the final primer. This section of DNA cannot be replicated in the same manner as the rest of the strand because there is no 3’ end to which the newly synthesized DNA can attach. This non-replicated fragment results in gradual loss of the chromosomal DNA during each cell duplication. Additionally, it can induce a DNA damage response by enzymes that recognize single-stranded DNA.
Telomeres and Telomerase02:41

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In eukaryotic DNA replication, a single-stranded DNA fragment remains at the end of a chromosome after the removal of the final primer. This section of DNA cannot be replicated in the same manner as the rest of the strand because there is no 3’ end to which the newly synthesized DNA can attach. This non-replicated fragment results in gradual loss of the chromosomal DNA during each cell duplication. Additionally, it can induce a DNA damage response by enzymes that recognize single-stranded DNA.
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Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds the telomeric...
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Analyzing Telomeric Protein-DNA Interactions Using Single-Molecule Magnetic Tweezers
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Tankyrase-1 assembly to large protein complexes blocks its telomeric function.

Kaori Hatsugai1, Tomokazu Ohishi, Yoshikazu Sugimoto

  • 1Division of Molecular Biotherapy, Cancer Chemotherapy Center, Japanese Foundation for Cancer Research, Tokyo, Japan.

FEBS Letters
|August 11, 2010
PubMed
Summary

Excessive tankyrase-1 forms nuclear foci that impair telomere elongation. This suggests large protein complexes can inhibit tankyrase-1

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Area of Science:

  • Molecular biology
  • Cell biology
  • Biochemistry

Background:

  • Tankyrase-1 modifies telomere-binding protein TRF1 through poly(ADP-ribosyl)ation.
  • TRF1 dissociation from telomeres promotes telomerase-mediated telomere elongation.
  • Tankyrase-1 multimerization via its sterile alpha motif domain is known, but its functional significance is unclear.

Purpose of the Study:

  • To investigate the functional implications of tankyrase-1 multimerization and complex formation.
  • To determine the effect of excessive tankyrase-1 on TRF1 dissociation and telomere elongation.

Main Methods:

  • Observation of tankyrase-1 nuclear foci formation under conditions of excess protein.
  • Analysis of focus formation dependence on homophilic and heterophilic interactions.
  • Assessment of TRF1 release from telomeres and telomere elongation capacity in the presence of foci.

Main Results:

  • High concentrations of tankyrase-1 lead to the formation of punctate nuclear foci.
  • Focus formation requires both homophilic self-assembly and interactions with other proteins.
  • These tankyrase-1 foci are functionally impaired, showing reduced TRF1 release and attenuated telomere elongation.

Conclusions:

  • Tankyrase-1 assembly into large nuclear complexes can sequester the protein and inhibit its telomeric function.
  • The formation of inactive protein aggregates suggests a regulatory mechanism for tankyrase-1 activity.
  • Understanding these complexes is crucial for comprehending telomere maintenance and telomerase regulation.