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Replication in Eukaryotes01:29

Replication in Eukaryotes

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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.
Many Proteins Orchestrate Replication at the Origin
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Replication in Eukaryotes02:31

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The Replisome03:01

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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.
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Chromosome Structure02:40

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A functional eukaryotic chromosome must contain three elements: a centromere, telomeres, and numerous origins of replication.
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Protein Complexes with Interchangeable Parts01:57

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Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
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Combining X-Ray Crystallography with Small Angle X-Ray Scattering to Model Unstructured Regions of Nsa1 from S. Cerevisiae
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La estructura cristalina del complejo de reconocimiento del origen eucariótico.

Franziska Bleichert1, Michael R Botchan2, James M Berger1

  • 1Department of Biophysics and Biophysical Chemistry, Johns Hopkins School of Medicine, Baltimore, Maryland 21205, USA.

Nature
|March 13, 2015
PubMed
Resumen
Este resumen es generado por máquina.

La estructura del complejo de reconocimiento de origen (ORC, por sus siglas en inglés) revela un nuevo mecanismo para controlar el inicio de la replicación del ADN. Esta estructura sugiere que ORC puede cambiar entre estados activos e inhibidos, impactando la regulación del ciclo celular.

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Área de la Ciencia:

  • Biología estructural Biología estructural.
  • Biología molecular La biología molecular.
  • Regulación del ciclo celular Regulación del ciclo celular

Sus antecedentes:

  • El inicio de la replicación del ADN celular es crucial para la estabilidad genómica.
  • El complejo de reconocimiento de origen heterohexameric (ORC) orquesta el inicio de la replicación en los eucariotas.

Objetivo del estudio:

  • Para determinar la estructura cristalina de Drosophila ORC.
  • Para aclarar la base estructural de la función ORC en el inicio de la replicación del ADN.

Principales métodos:

  • Cristalografía de rayos X con una resolución de 3,5 Å.
  • Análisis estructural del complejo de núcleos ORC de 270 kDa.

Principales resultados:

  • La estructura ORC revela un anillo de dos capas con dominios de hélice alada y AAA+.
  • Se observó un intercambio no anticipado entre dominios y un canal de unión de ADN cuasi-espiral.
  • Una rotación significativa del dominio Orc1 AAA+ sugiere un mecanismo de autoinhibición.

Conclusiones:

  • Drosophila ORC rodea el ADN y activa el complejo MCM2-7 para la carga de helicasa.
  • La estructura indica que ORC puede hacer la transición entre conformaciones activas y autoinhibidas.
  • Esta conmutación conformacional ofrece un nuevo mecanismo regulador para el control del ciclo celular.