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Replication in Prokaryotes01:32

Replication in Prokaryotes

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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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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...
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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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In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
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The cell cycle is a series of events leading to DNA duplication followed by the division of cell content to form two daughter cells. The cell cycle progresses in four stages—the cell increases in size (gap 1 or G1-phase), duplicates its DNA (synthesis or S-phase), prepares to divide (gap 2 or G2-phase), and divides (mitosis or M-phase).
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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,...
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Determination of the Optimal Chromosomal Locations for a DNA Element in Escherichia coli Using a Novel Transposon-mediated Approach
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Nutritional control of bacterial DNA replication.

Joel Hallgren1, Kristina Jonas1

  • 1Department of Molecular Biosciences, The Wenner-Gren Institute, Science for Life Laboratory, Stockholm University, 106 91 Stockholm, Sweden.

Current Opinion in Microbiology
|November 30, 2023
PubMed
Summary

This review explores how bacteria control DNA replication in response to nutrient availability. It focuses on two species, Caulobacter and Escherichia, and examines how they regulate replication initiation under starvation. The study highlights the role of DnaA and (p)ppGpp in this process. These molecules help bacteria adjust replication timing based on growth conditions. The authors compare findings across species and note differences in regulatory strategies. The review suggests that these mechanisms are important for bacterial adaptation to changing environments. It also points out gaps in understanding how these pathways function in different species.

Keywords:
DNA replication regulationBacterial growth controlNutrient signaling in bacteriaDnaA protein function

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Inducing a Site Specific Replication Blockage in E. coli Using a Fluorescent Repressor Operator System
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Determination of the Optimal Chromosomal Locations for a DNA Element in Escherichia coli Using a Novel Transposon-mediated Approach
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Visualization of DNA Replication in the Vertebrate Model System DT40 using the DNA Fiber Technique
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Area of Science:

  • Microbial physiology
  • Molecular genetics
  • Nutritional microbiology

Background:

Cells must regulate DNA replication in line with growth and nutrient availability. A long-standing model suggests replication is tied to cell mass increase in bacteria. Recent findings support this model despite ongoing debates. The molecular mechanisms connecting growth and replication remain unclear. Studies in Caulobacter crescentus and Escherichia coli have revealed some regulatory pathways. These include DnaA regulation and (p)ppGpp signaling. Researchers have not yet fully explained how these mechanisms function across species. Understanding these processes could clarify bacterial adaptation to environmental changes.

Purpose Of The Study:

This review aims to examine how DNA replication initiation is regulated in bacteria under nutrient stress. The study focuses on mechanisms involving DnaA and (p)ppGpp. The goal is to compare findings across different species. The authors seek to clarify how these mechanisms vary with growth conditions. They also aim to identify similarities and differences in regulatory strategies. The review considers the role of nutrient availability in replication control. It addresses gaps in understanding how bacteria adapt replication to growth. The study provides a synthesis of recent and prior findings in this area.

Main Methods:

The authors synthesized existing literature on DNA replication in bacteria. They focused on studies involving Caulobacter crescentus and Escherichia coli. The review approach included comparing findings across species. They examined the role of DnaA and (p)ppGpp in replication regulation. The authors considered how these mechanisms respond to nutrient changes. They analyzed data from experiments under starvation conditions. The review included a discussion of molecular signaling pathways. The synthesis emphasized species-specific and shared regulatory features.

Main Results:

Recent findings support the link between DNA replication and cell mass in bacteria. Studies show DnaA levels change in response to nutrient availability. (p)ppGpp signaling also influences replication initiation under starvation. These mechanisms differ between Caulobacter and Escherichia. The review highlights how these pathways are activated under specific growth conditions. DnaA abundance decreases when nutrients are scarce in some species. (p)ppGpp levels increase during starvation, affecting replication timing. The authors found that these responses are species-dependent and context-specific.

Conclusions:

The review suggests that DNA replication initiation is regulated by growth and nutrient availability. The authors propose that DnaA and (p)ppGpp are key players in this regulation. They note that mechanisms vary between bacterial species. The findings indicate that these pathways are activated under specific conditions. The review supports the idea that replication is tightly linked to cell growth. The authors suggest that these mechanisms help bacteria adapt to environmental changes. They emphasize the need for further research into species-specific responses. The synthesis highlights gaps in understanding how these pathways interact.

According to the authors, DNA replication initiation is regulated by DnaA abundance and (p)ppGpp signaling in response to nutrient changes.

The authors propose that (p)ppGpp signaling influences replication initiation under starvation conditions in some bacterial species.

The authors suggest that DnaA levels decrease in some species when nutrients are scarce, affecting replication timing.

The authors highlight that these species show different regulatory mechanisms, indicating species-specific responses to nutrient changes.

The authors propose that specific growth conditions activate different regulatory pathways, such as DnaA or (p)ppGpp signaling.

The authors suggest that these mechanisms help bacteria adapt to environmental changes by linking replication to nutrient availability.