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Related Concept Videos

Amyloid Fibrils03:03

Amyloid Fibrils

Amyloid fibrils are aggregates of misfolded proteins.  Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils. 
Amyloid deposits were observed as early as 1639 in the liver and the spleen.   In 1854, Rudolph Virchow performed iodine staining, normally used to...
Membrane Fluidity01:26

Membrane Fluidity

Membrane fluidity is explained by the fluid mosaic model of the cell membrane, which describes the plasma membrane structure as a mosaic of components—including phospholipids, cholesterol, proteins, and carbohydrates—that gives the membrane a fluid character.
Mosaic nature of the membrane
The mosaic characteristic of the membrane helps the plasma membrane remain fluid. The integral proteins and lipids exist as separate but loosely-attached molecules in the membrane. The membrane is a relatively...
Membrane Fluidity01:23

Membrane Fluidity

Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.
Cytoplasm01:16

Cytoplasm

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Protein Complexes with Interchangeable Parts01:57

Protein Complexes with Interchangeable Parts

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.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...

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4D Imaging of Protein Aggregation in Live Cells
08:59

4D Imaging of Protein Aggregation in Live Cells

Published on: April 5, 2013

Enzyme agglomerates change cytoplasmic fluidity.

Remy Colin1, Victor Sourjik1

  • 1Department of Systems and Synthetic Microbiology, Max Planck Institute for Terrestrial Microbiology and Center for Synthetic Microbiology (SYNMIKRO), Marburg, Germany.

Molecular Cell
|May 8, 2026
PubMed
Summary
This summary is machine-generated.

Bacterial enzymes form agglomerates that control cell fluidity. These structures hinder large molecule diffusion but allow smaller proteins to move more freely, impacting bacterial growth.

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Area of Science:

  • Microbiology
  • Cell Biology
  • Biochemistry

Background:

  • Cytoplasmic fluidity is crucial for bacterial cell function.
  • The diffusion of molecules within the bacterial cytoplasm is essential for metabolic processes.
  • Understanding factors affecting cytoplasmic viscosity is key to comprehending bacterial physiology.

Purpose of the Study:

  • To investigate the role of enzyme agglomerates in controlling bacterial cytoplasmic fluidity.
  • To determine how these agglomerates affect the diffusion of different-sized molecules within the cytoplasm.
  • To elucidate the impact of growth conditions on the formation and function of these enzyme aggregates.

Main Methods:

  • Microscopy techniques to visualize enzyme agglomerates.
  • Biochemical assays to identify enzymes involved in amino acid metabolism.
  • Diffusion assays to measure the movement of various molecules within the cytoplasm.
  • Analysis of bacterial growth under different conditions.

Main Results:

  • Identified agglomerates of enzymes involved in amino acid metabolism.
  • Demonstrated that these agglomerates act as obstacles, hindering the diffusion of large, ribosome-sized objects.
  • Showed that the agglomerates create free space, facilitating faster diffusion of smaller proteins.
  • Confirmed that the formation and impact of these agglomerates are dependent on bacterial growth conditions.

Conclusions:

  • Enzyme agglomerates are critical regulators of bacterial cytoplasmic fluidity.
  • These structures dynamically modulate the intracellular environment based on growth conditions.
  • The findings provide new insights into the physical constraints governing molecular transport in bacteria.