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Related Concept Videos

Cytoplasm01:16

Cytoplasm

The cytoplasm consists of organelles and a framework of protein scaffolds called the cytoskeleton suspended in an aqueous solution, the cytosol. The cytosol is a rich broth of water, ions, salts, and various organic molecules.Protein Folding and MisfoldingThe cytoplasm is the location for several cellular processes, including protein synthesis and folding. The aqueous nature of the cytosol promotes protein folding such that the hydrophobic amino acid side chains are buried in the protein core...
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Salt stress—which can be triggered by high salt concentrations in a plant’s environment—can significantly affect plant growth and crop production by influencing photosynthesis and the absorption of water and nutrients.
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ABC Transporters: Importer

ATP-binding cassette or ABC transporters are a class of ATP-driven pumps that hydrolyze ATP to move solutes across the membrane. They can be grouped into importers and exporters. While exporters are present in all domains of life, importers exist only in bacteria and some plants.
In bacteria, based on the number of transmembrane helices and the chemical nature of their substrates, the ABC importers can be divided into three types:
Cell Inclusions01:27

Cell Inclusions

Prokaryotic cells possess a variety of inclusions that play crucial roles in nutrient storage, metabolic processes, and environmental adaptation. These structures enable bacteria to thrive under fluctuating environmental conditions by storing essential resources and optimizing their metabolic efficiency.Carbon Storage: Poly-β-Hydroxybutyric Acid and Glycogen GranulesBacteria frequently store excess carbon in specialized granules. Poly-β-hydroxybutyric acid (PHB) granules are lipid polymers that...
Factors Influencing Microbial Growth: Osmolarity01:28

Factors Influencing Microbial Growth: Osmolarity

Osmolarity is the measure of solute concentration in a solution. It plays a critical role in determining water availability for organisms. Water moves across semipermeable membranes through osmosis, flowing from regions of lower solute concentration (more dilute) to regions of higher solute concentration (more concentrated).In high-solute environments, microbial cells lose water, leading to dehydration and inhibited growth. The extent to which water is available to microbes in such environments...
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Sporulation is a complex developmental process that allows certain Gram-positive bacteria, such as Bacillus subtilis and Clostridium species, to survive extreme environmental conditions. This process is tightly regulated by a series of signaling cascades and transcriptional controls, ensuring the formation of a highly resistant endospore.Sporulation is triggered by unfavorable conditions, such as nutrient depletion, and is governed by a phosphorelay system. One of the sensor kinases, such as...

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Related Experiment Video

Updated: Jul 8, 2026

Monitoring Intraspecies Competition in a Bacterial Cell Population by Cocultivation of Fluorescently Labelled Strains
06:45

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Published on: January 18, 2014

Salting-in the microbial cytoplasm.

F N Braun1

  • 1Institute of Medical Biology, University of Tromso, N-9037 Tromso, Norway. Nicholas.Braun@fagmed.uit.no

FEBS Letters
|January 24, 2006
PubMed
Summary

Microbial osmolytes, like glycine betaine, help regulate cell volume. Their ability to avoid bound water stabilizes the cytoplasm and prevents harmful phase separation within cells.

Area of Science:

  • Microbiology
  • Biophysics
  • Cell Biology

Background:

  • Microbes utilize osmolytes for osmotic regulation.
  • Compatible osmolytes, such as glycine betaine, are crucial for cellular function under stress.
  • These molecules avoid tightly bound water associated with macromolecules.

Purpose of the Study:

  • To investigate the role of compatible osmolytes in cytoplasmic thermodynamic stabilization.
  • To explore how compatible osmolytes prevent cytoplasmic phase separation.
  • To elucidate the mechanism by which glycine betaine contributes to cellular stability.

Main Methods:

  • Utilized a molecular statistical approach.
  • Analyzed the interaction of compatible osmolytes with cytoplasmic water.

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  • Modeled the effects of high osmolyte concentrations on cytoplasmic phase behavior.

    • Main Results:

    • Compatible osmolytes, particularly glycine betaine, minimize bound water around macromolecules.
    • This property is linked to the thermodynamic stabilization of the cytoplasm.
    • High concentrations of compatible osmolytes effectively prevent cytoplasmic phase separation.

    Conclusions:

    • The unique hydration properties of compatible osmolytes are key to cytoplasmic stability.
    • Compatible osmolytes act as a protective mechanism against osmotic stress-induced phase separation.
    • Glycine betaine's interaction with water is critical for maintaining cellular homeostasis.