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DNA replication has three main steps: initiation, elongation, and termination. Replication in prokaryotes begins when initiator proteins bind to the single origin of replication (ori) on the cell's circular chromosome. Replication then proceeds around the entire circle of the chromosome in each direction from the two replication forks, resulting in two DNA molecules.
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Coordination of Gene Expression Processes in Bacteria01:29

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The DNA replication, transcription, and translation processes are intricately coupled in bacteria, allowing efficient gene expression and rapid protein synthesis. While this physical and functional coordination is advantageous, it introduces challenges that bacteria overcome through specific regulatory mechanisms.Coupling of Replication, Transcription, and TranslationThe coupling of replication, transcription, and translation is a hallmark of bacterial gene expression. As the replisome unwinds...
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Bacterial pathogens depend on precise and efficient DNA replication to sustain infection. Two type II topoisomerases—DNA gyrase and topoisomerase IV—are critical to this process, as they resolve DNA supercoiling and unlink chromosomes during replication. Fluoroquinolones, synthetic derivatives of quinolones, exploit this mechanism by stabilizing the transient DNA–enzyme cleavage complex, preventing strand religation, and causing lethal double-strand breaks. These antibiotics are selectively...

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Video Experimental Relacionado

Updated: Jul 15, 2026

Inducing a Site Specific Replication Blockage in E. coli Using a Fluorescent Repressor Operator System
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Published on: August 21, 2016

SeqA: un modulador negativo de la iniciación de la replicación en E. coli.

M Lu1, J L Campbell, E Boye

  • 1Department of Biochemistry and Molecular Biology Harvard University, Cambridge, Massachusetts 02138.

Cell
|May 6, 1994
PubMed
Resumen

El gen SeqA controla el inicio de la replicación del ADN bacteriano al prevenir el inicio prematuro. Este gen actúa como un regulador negativo, equilibrando los factores positivos para un control preciso del ciclo celular.

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Área de la Ciencia:

  • Biología Molecular Biología Molecular
  • Microbiología Microbiología.
  • Regulación del ciclo celular de las bacterias.

Sus antecedentes:

  • La replicación del ADN bacteriano se inicia en un origen único, oriC.
  • En las células de rápido crecimiento, existen múltiples copias de oriC e inician sincrónicamente una vez por ciclo celular.
  • Un proceso de secuestro evita iniciaciones secundarias al apuntar a sitios GATC hemimetilados en orígenes recientemente replicados.

Objetivo del estudio:

  • Para identificar el gen responsable del proceso de secuestro en E. coli.
  • Para investigar el papel del gen identificado en la regulación de la iniciación de la replicación del ADN.
  • Comprender el equilibrio de los elementos reguladores positivos y negativos en el control de la replicación.

Principales métodos:

  • Cribado genético para identificar los genes necesarios para el secuestro.
  • Ensayos in vivo para evaluar la función del gen identificado (seqA) en el inicio de la replicación.
  • Análisis de la interacción de seqA con orígenes hemimetilados y factores de iniciación.

Principales resultados:

  • Identificación del gen seqA como esencial para el secuestro de los orígenes hemimetilados.
  • Demostración de que seqA actúa como un modulador negativo de la iniciación de la replicación primaria.
  • Observación de que la función de seqA contrasta con los factores de iniciación positiva previamente identificados.

Conclusiones:

  • El control preciso de la iniciación de la replicación del ADN bacteriano implica un equilibrio entre los elementos reguladores positivos y negativos.
  • La proteína SeqA juega un papel crucial como un regulador negativo, evitando la replicación prematura.
  • SeqA puede funcionar como un factor de cooperación, mediando las interacciones entre los componentes de iniciación de replicación.