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Replication in Eukaryotes02:31

Replication in Eukaryotes

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The DNA Replication Fork01:02

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An organism’s genome needs to be duplicated in an efficient and error-free manner for its growth and survival. The replication fork is a Y-shaped active region where two strands of DNA are separated and replicated continuously. The coupling of DNA unzipping and complementary strand synthesis is a characteristic feature of a replication fork.   Organisms with small circular DNA, such as E. coli, often have a single origin of replication; therefore, they have only two replication forks, one in...
Restarting Stalled Replication Forks02:37

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DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart, a...
The DNA Replication Fork01:02

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An organism’s genome needs to be duplicated in an efficient and error-free manner for its growth and survival. The replication fork is a Y-shaped active region where two strands of DNA are separated and replicated continuously. The coupling of DNA unzipping and complementary strand synthesis is a characteristic feature of a replication fork.   Organisms with small circular DNA, such as E. coli, often have a single origin of replication; therefore, they have only two replication forks, one in...
Replication in Eukaryotes01:29

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In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
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Restarting Stalled Replication Forks02:37

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DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart, a...

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Updated: Jul 17, 2026

Direct Observation of Enzymes Replicating DNA Using a Single-molecule DNA Stretching Assay
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Published on: March 23, 2010

Desestabilización de la hélice inducida por proteínas de iniciación en el origen lambda: un paso preliminar en la

M Schnos1, K Zahn, R B Inman

  • 1Institute for Molecular Virology, University of Wisconsin-Madison 53706.

Cell
|February 12, 1988
PubMed
Resumen

La proteína O iniciadora del fago lambda se une a la secuencia de origen, causando cambios estructurales en el ADN cruciales para el inicio de la replicación. Este proceso, dependiente de la tensión superhélica del ADN, es el primer paso en la replicación bidireccional.

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Área de la Ciencia:

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

Sus antecedentes:

  • La proteína O iniciadora del fago lambda se une al origen lambda de la replicación (ori).
  • Comprender los eventos moleculares iniciales de la replicación del ADN es crucial para comprender la propagación viral y la estabilidad del genoma.

Objetivo del estudio:

  • Investigar los cambios estructurales en la secuencia de origen lambda tras la unión de la proteína iniciadora O.
  • Determinar el papel de la tensión superhélica del ADN en la interacción O-ori y sus implicaciones para el inicio de la replicación.

Principales métodos:

  • Se utilizaron ensayos de sensibilidad a la nucleasa para detectar modificaciones estructurales en el ADN.
  • Los experimentos involucraron secuencias de ori de tipo silvestre y mutante para evaluar la relevancia funcional de los cambios observados.

Principales resultados:

  • La unión de la proteína O induce una alteración estructural significativa en una región específica rica en AT de la secuencia ori.
  • Esta modificación del ADN es independiente de la hidrólisis del ATP y se reduce con los ori mutantes no replicantes.
  • El cambio estructural es críticamente dependiente de la tensión superhélica en el ADN y exhibe características de separación de hebras.

Conclusiones:

  • La interacción entre la proteína O iniciadora de los fagos lambda y la secuencia ori induce una modificación estructural del ADN dependiente de la tensión.
  • Esta modificación se propone como un evento preliminar fundamental, que representa el paso inicial en el inicio de la replicación bidireccional del ADN en los fagos lambda.