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Chemotaxis in E. coli01:27

Chemotaxis in E. coli

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Chemotaxis in Escherichia coli is a sensory-driven motility mechanism that enables bacteria to navigate chemical gradients, moving toward beneficial environments while avoiding harmful conditions. This process relies on a signal transduction system integrating external chemical cues with flagellar motor control.Chemoreceptors and Signal DetectionE. coli detects chemical gradients through methyl-accepting chemotaxis proteins (MCPs), which are membrane-bound chemoreceptors that sense attractants...
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Chemotaxis and Direction of Cell Migration01:21

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Cells can detect chemical cues in their environment and reorganize the cytoskeleton to migrate toward them or away from them. This directional migration, called chemotaxis, is essential during embryogenesis and development, immune response, tissue repair and regeneration, and reproduction. These chemical cues can either attract or repel the cell's movement. For example, axon development is determined by a combination of chemoattractants and chemorepellents that direct the growing axon...
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Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the parent species, and barriers to reproduction will typically exist. There are two primary mechanisms, speciation with and without geographic isolation—allopatric and sympatric speciation, respectively.
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There is no one solvent that can dissolve every type of solute. Some substances that readily dissolve in a certain solvent might be insoluble in a different solvent. A simple way to predict which substances dissolve in which solvent is the phrase "like dissolves like". This means that polar substances, such as salt and sugar, dissolve in a polar substance like water. In contrast, non-polar substances are more soluble in non-polar solvents such as carbon tetrachloride.
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Enthalpy changes are typically tabulated for reactions in which both the reactants and products are at the same conditions. A standard state is a commonly accepted set of conditions used as a reference point for the determination of properties under other different conditions. For chemists, the IUPAC standard state refers to materials under a pressure of 1 bar and solutions at 1 M and does not specify a temperature. Many thermochemical tables list values with a standard state of 1 atm. Because...
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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Imaging G Protein-coupled Receptor-mediated Chemotaxis and its Signaling Events in Neutrophil-like HL60 Cells
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Metabolon formation by chemotaxis.

Xi Zhao1, Ayusman Sen1

  • 1Department of Chemistry, The Pennsylvania State University, University Park, PA, United States.

Methods in Enzymology
|February 21, 2019
PubMed
Summary
This summary is machine-generated.

Enzymes in metabolic pathways organize via chemotaxis, moving along substrate gradients. This rapid, substrate-driven migration may explain how cellular metabolic networks are organized.

Keywords:
ChemotaxisDiffusionEnzyme cascadeGlycolysisMetabolons

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Systems Biology

Background:

  • Metabolons, or enzyme complexes facilitating reaction cascades, are known to form but their assembly mechanism remains unclear.
  • Understanding enzyme organization is crucial for deciphering cellular metabolic regulation.

Purpose of the Study:

  • To investigate the mechanism of metabolon formation and enzyme organization in metabolic pathways.
  • To study the coordinated movement of the first four enzymes in glycolysis: hexokinase, phosphoglucose isomerase, phosphofructokinase, and aldolase.

Main Methods:

  • Utilized microfluidic and fluorescent spectroscopy techniques to track enzyme movement.
  • Analyzed enzyme migration in response to substrate gradients generated by preceding enzymatic reactions.

Main Results:

  • Each of the four studied glycolytic enzymes independently migrated along its specific substrate gradient.
  • Enzyme migration extent correlated with substrate gradient exposure time.
  • Chemotactic enzyme migration was rapid, even in simulated cytosolic crowding conditions, mirroring in-cell diffusion rates.

Conclusions:

  • Chemotaxis, or directed movement along chemical gradients, is a potential mechanism for organizing metabolic networks within the cell cytosol.
  • This finding offers a new perspective on the spatial organization and efficiency of metabolic pathways.