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Sulfur sequestration promotes multicellularity during nutrient limitation.

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Nutrient limitation in Dictyostelium discoideum triggers reactive oxygen species, sequestering cysteine in glutathione. This sulfur regulation halts proliferation, enabling multicellular development and highlighting oxygen and sulfur

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Area of Science:

  • Cellular Biology
  • Biochemistry
  • Developmental Biology

Background:

  • Dictyostelium discoideum exhibits nutrient-dependent behavioral changes, switching from unicellular to multicellular states upon starvation.
  • This organism serves as a model for understanding how metabolism influences cell differentiation and function.

Purpose of the Study:

  • To investigate the role of reactive oxygen species (ROS) in nutrient-limited Dictyostelium discoideum.
  • To elucidate the mechanism by which sulfur metabolism regulates cell fate and development in response to nutrient availability.

Main Methods:

  • Analysis of reactive oxygen species production under nutrient limitation.
  • Quantification of cysteine sequestration in glutathione.
  • Assessment of sulfur utilization in protein translation and iron-sulfur cluster enzyme activity.

Main Results:

  • Nutrient limitation induces ROS, leading to cysteine sequestration in glutathione.
  • This sequestration limits sulfur availability for mitochondrial metabolism and cellular proliferation.
  • Sulfur regulation by ROS maintains a nonproliferating state, facilitating multicellular development.

Conclusions:

  • Reactive oxygen species act as signaling molecules, mediating cell fate decisions through sulfur regulation.
  • Oxygen and sulfur are identified as key signaling molecules dictating cell fate in early eukaryotes.
  • The findings have implications for understanding cellular responses to nutrient fluctuations in multicellular organisms.