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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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Telomerase RNA structural heterogeneity in living human cells detected by DMS-MaPseq.

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POT1 recruits and regulates CST-Polα/primase at human telomeres.

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bioRxiv : the preprint server for biology·2023
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Video Experimental Relacionado

Updated: May 11, 2026

In vitro Reconstitution of the Active T. castaneum Telomerase
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El complejo telomérico POT1-TPP1 es un factor de procesividad de la telomerasa.

Feng Wang1, Elaine R Podell, Arthur J Zaug

  • 1Department of Biological Chemistry, University of Michigan Medical School, MSRBIII 5301D, 1150 W. Medical Center Drive, Ann Arbor, Michigan 48109, USA.

Nature
|January 24, 2007
PubMed
Resumen

El complejo proteico POT1-TPP1 se une al ADN telomérico y mejora la actividad de la telomerasa humana. Este hallazgo sugiere un doble papel para POT1-TPP1 en la regulación de la longitud y la estabilidad de los telómeros.

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Área de la Ciencia:

  • Biología Molecular Biología Molecular
  • Genética La genética.
  • La bioquímica es la bioquímica.

Sus antecedentes:

  • Los telómeros protegen los extremos de los cromosomas de la degradación y la fusión.
  • POT1 (protección de los telómeros) se une a los salientes de ADN rico en G en los telómeros.
  • TPP1 es un socio vinculante de POT1 propuesto para ser parte del complejo de refugio.

Objetivo del estudio:

  • Para determinar la relación estructural entre TPP1 y POT1.
  • Para investigar el efecto del complejo POT1-TPP1 en la actividad de la telomerasa.

Principales métodos:

  • Determinación de la estructura cristalina de un dominio TPP1 humano.
  • Pruebas bioquímicas para evaluar la actividad de la telomerasa y la procesividad en presencia de POT1-TPP1 y ADN telomérico.

Principales resultados:

  • La estructura cristalina de TPP1 reveló un pliegue de unión de oligonucleótidos / oligosacáridos similar a la subunidad beta de la proteína de unión de los telómeros finales de un protozoario, lo que sugiere que TPP1 es la subunidad beta de POT1.
  • El complejo POT1-TPP1, unido al ADN telomérico, aumentó significativamente la actividad y la procesividad de la telomerasa humana.

Conclusiones:

  • TPP1 se identifica como la subunidad beta faltante del POT1 humano.
  • El complejo POT1-TPP1 actúa como un factor de procesividad para la telomerasa, mejorando la extensión de los telómeros, en contraste con el papel inhibidor de otras proteínas de unión final del ADN telomérico.