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Related Concept Videos

Replication in Prokaryotes02:35

Replication in Prokaryotes

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Replication in Prokaryotes01:32

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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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Prokaryotic Transcriptional Activators and Repressors01:58

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The organization of prokaryotic genes in their genome is notably different from that of eukaryotes. Prokaryotic genes are organized, such that the genes for proteins involved in the same biochemical process or function are located together in groups. This group of genes, along with their regulatory elements, are collectively known as an operon. The functional genes in an operon are transcribed together to give a single strand of mRNA known as polycistronic mRNA.
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The present-day mitochondrial and chloroplast genomes have retained some of the characteristics of their ancestral prokaryotes and also have acquired new attributes during their evolution within eukaryotic cells. Like prokaryotic genomes, mitochondrial and chloroplast genomes neither bind with histone-like proteins nor show complex packaging into chromosome-like structures, as observed in eukaryotes. Unlike mitotic cell divisions observed in eukaryotic cells, mitochondria and chloroplasts...
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Protein Diffusion in the Membrane01:24

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Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
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Easy Measurement of Diffusion Coefficients of EGFP-tagged Plasma Membrane Proteins Using k-Space Image Correlation Spectroscopy
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How Important Is Protein Diffusion in Prokaryotes?

Paul E Schavemaker1, Arnold J Boersma1, Bert Poolman1

  • 1Department of Biochemistry, University of Groningen, Groningen, Netherlands.

Frontiers in Molecular Biosciences
|November 29, 2018
PubMed
Summary
This summary is machine-generated.

Diffusion coefficients are crucial for prokaryotic cell function, impacting reaction rates and cellular phenomena. Further research is needed to fully understand diffusion limitation across various conditions and cell types.

Keywords:
crowdingdiffusion limitationprokaryoteprotein diffusionreaction rate

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Area of Science:

  • Cellular biology
  • Biophysics

Background:

  • Diffusion is essential for cellular processes.
  • The significance of diffusion coefficients in prokaryotes is not fully understood.

Purpose of the Study:

  • To explore the importance of diffusion coefficients in prokaryotic cells.
  • To identify cases where diffusion coefficients limit reaction rates or enable cellular phenomena.

Main Methods:

  • Review of diffusion principles, focusing on diffusion-limited reactions.
  • Compilation of known diffusion coefficient values in prokaryotes and in vitro systems.

Main Results:

  • Diffusion coefficients play a critical role in prokaryotic cell function.
  • Specific examples illustrate diffusion limitation impacting reaction rates and cellular phenomena.

Conclusions:

  • Diffusion coefficients are a key factor in prokaryotic cell function.
  • Further research is required on temperature, cell size, membrane proteins, and cellular context.