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The Proteasome02:18

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Eukaryotic cells can degrade proteins through several pathways. One of the most important amongst these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
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Updated: Feb 15, 2026

Cell Subtype-specific Analysis of Neuronal Membrane Proteasome in Somatosensory Neurons
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Cell Subtype-specific Analysis of Neuronal Membrane Proteasome in Somatosensory Neurons

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Sem1 links proteasome stability and specificity to multicellular development.

Miriam Kolog Gulko1,2, Gabriele Heinrich1,2, Carina Gross1,2

  • 1Department of Molecular Microbiology & Genetics, University of Goettingen, Goettingen, Germany.

Plos Genetics
|February 6, 2018
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Summary

The Sem1 proteasome subunit is crucial for fungal development and stress response. Its absence impacts proteasome assembly and cellular integrity during oxidative stress and differentiation.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Multicellular development is evolutionarily linked to oxidative stress and protein degradation.
  • The proteasome is a key regulator of protein homeostasis and cellular processes.

Purpose of the Study:

  • To investigate the role of the Sem1 proteasome subunit in fungal development and stress response.
  • To elucidate the function of Sem1 in proteasome assembly and cellular integrity.

Main Methods:

  • Genetic analysis of a sem1 deletion strain in Aspergillus nidulans.
  • Biochemical assays to assess proteasome activity and assembly.
  • Gene expression analysis under oxidative stress conditions.

Main Results:

  • Sem1 is essential for fungal cell differentiation and development.
  • A sem1 deletion strain exhibits altered proteasome composition and activity.
  • Sem1 is required for efficient 26S proteasome assembly and stabilization of key subunits.
  • Sem1 influences cellular NADH levels and mitochondria integrity during stress.

Conclusions:

  • Sem1 acts as a critical link between oxidative stress response and cellular differentiation in fungi.
  • Sem1 plays a vital role in maintaining proteasome function and cellular homeostasis during development and stress.