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Scientists discovered a novel membrane proteasome complex in the nervous system. This complex rapidly releases peptides that regulate neuronal signaling, challenging the traditional view of proteasomes in proteostasis.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • Proteasome function is traditionally linked to proteostasis (protein homeostasis).
  • The acute regulation of rapid neuronal processes like calcium signaling by proteasomes remains unclear.
  • This challenges the established understanding of proteasome roles in cellular regulation.

Purpose of the Study:

  • To investigate the mechanism by which proteasomes acutely regulate neuronal function.
  • To identify and characterize a novel proteasome complex involved in neuronal signaling.
  • To challenge the canonical role of proteasomes in proteostasis.

Main Methods:

  • Characterization of a mammalian nervous-system-specific membrane proteasome complex.
  • Utilizing cell-impermeable proteasome inhibitors to assess function.
  • Measuring neuronal activity-induced calcium signaling.
  • Analyzing the effects of membrane-proteasome-derived peptides on neuronal signaling.

Main Results:

  • A novel, catalytically active membrane proteasome complex associated with neuronal plasma membranes was identified.
  • Inhibition of this complex blocked extracellular peptide production and attenuated calcium signaling.
  • Extracellular peptides generated by the membrane proteasome were sufficient to induce neuronal calcium signaling.

Conclusions:

  • The nervous system utilizes a membrane proteasome complex for rapid, direct modulation of neuronal function.
  • This complex degrades intracellular proteins into extracellular peptides that stimulate neuronal signaling.
  • These findings reveal a novel form of intercellular communication and expand the known functions of proteasomes beyond proteostasis.