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DNA Helicases00:55

DNA Helicases

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DNA unwinding helicase enzymes are a type of motor protein. Motor proteins can translocate along filaments or polymers using energy generated from ATP hydrolysis. Helicases are involved in all the important cellular processes where DNA unwinding is required, such as DNA replication, repair, recombination, and transcription. They are present in all living organisms, but vary in their structure, function, and mechanism of action. For example, in prokaryotes, DnaB helicase binds and translocates...
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The DNA Replication Fork01:02

The DNA Replication Fork

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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...
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The DNA Replication Fork01:02

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DNA Replication02:40

DNA Replication

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DNA replication involves the separation of the two strands of the double helix, with each strand serving as a template from which the new complementary strand is copied.  After replication, each double-stranded DNA includes one parental or “old” strand and one “new” strand. This is known as semiconservative replication. The resulting DNA molecules have the same sequence and are divided equally into the two daughter cells.
Replication in Prokaryotes
DNA replication...
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The Replisome03:01

The Replisome

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DNA replication is carried out by a large complex of proteins that act in a coordinated matter to achieve high-fidelity DNA replication. Together this complex is known as the DNA replication machinery or the replisome.
The synthesis of the leading and lagging strands is a highly coordinated process. To explain this, the “Trombone model” was proposed by Bruce Alberts in 1980. The DNA loop formation starts when a primer is synthesized on the parent lagging strand. The loop grows with...
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The Replisome03:01

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Video Experimental Relacionado

Updated: May 5, 2026

Strand-Specific Analysis of Proteins at Replicating DNA Strands by Enrichment and Sequencing of Protein-Associated Nascent DNA Method
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Conocimientos estructurales sobre la replicación del ADN sin enlaces de hidrógeno.

Karin Betz1, Denis A Malyshev, Thomas Lavergne

  • 1Departments of Chemistry and Biology, Konstanz Research School Chemical Biology, Universität Konstanz , Universitätsstrasse 10, D-78464 Konstanz, Germany.

Journal of the American Chemical Society
|November 29, 2013
PubMed
Resumen
Este resumen es generado por máquina.

La expansión del alfabeto genético con pares de bases no naturales como d5SICS-dNaM mejora el potencial del ADN. Sin embargo, su replicación se enfrenta a desafíos debido a las interacciones de la polimerasa y la intercalación de pares de bases.

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Área de la Ciencia:

  • Biología Molecular Biología Molecular
  • Biología sintética Biología sintética.
  • La bioquímica es la bioquímica.

Sus antecedentes:

  • La expansión del alfabeto genético con pares de bases no naturales (UBPs) promete un mayor potencial genético y químico.
  • El par d5SICS-dNaM es una UBP de replicación eficiente, pero su mecanismo de replicación sigue sin estar claro debido a su estructura intercalada en el ADN libre.

Objetivo del estudio:

  • Para investigar la formación de complejos pre y post-química durante la inserción de dNaMTP frente a d5SICS.
  • Para aclarar la dinámica estructural y las interacciones de la polimerasa que rigen la replicación del par de bases no naturales d5SICS-dNaM.

Principales métodos:

  • Caracterización de los complejos prequímicos para la inserción de dNaMTP frente a d5SICS.
  • Análisis de complejos postquímicos que detallan la posición y conformación del par de bases antinaturales después de la inserción.
  • Investigando las interacciones del sitio activo de la polimerasa y las afinidades de unión de nucleótidos.

Principales resultados:

  • A diferencia de la inserción d5SICSTP, la adición de dNaMTP no induce completamente un estado cerrado de la polimerasa.
  • Después de la inserción, el par d5SICS-dNaM intercala dentro del sitio activo de la polimerasa a través de dos modos distintos, influenciados por los nucleótidos flanqueantes.
  • La intercalación reduce la afinidad para la posterior unión correcta del trifosfato, lo que impide una mayor extensión del primer.

Conclusiones:

  • La replicación del par de bases no natural d5SICS-dNaM está limitada por la intercalación posterior a la inserción y la posterior necesidad de desintercalación y reorganización del sitio activo.
  • Comprender estas dinámicas estructurales es crucial para optimizar la replicación de UBPs y avanzar en la biología sintética.