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Peroxisomal core structures segregate diverse metabolic pathways.

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Peroxisome cores compartmentalize enzymes, creating specialized organelles. Specific protein motifs drive this self-assembly, impacting metabolic functions and potentially occurring across species.

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Mycology

Background:

  • Peroxisomes are vital organelles involved in metabolic processes like fatty acid oxidation.
  • Some peroxisomes form electron-dense cores containing specific enzymes, but their formation and function remain unclear.

Purpose of the Study:

  • To investigate the formation and function of protein cores within peroxisomes in the smut fungus Ustilago maydis.
  • To identify the molecular mechanisms underlying protein self-assembly into these peroxisomal sub-compartments.

Main Methods:

  • Analysis of detergent-resistant peroxisomal core structures in Ustilago maydis.
  • In vitro protein self-assembly assays to identify functional motifs.
  • In vivo studies of motif function and impact on peroxisome activity.
  • Functional assays in mammalian cells to assess motif conservation.

Main Results:

  • Detergent-resistant cores in Ustilago maydis peroxisomes are enriched in specific enzymes, excluding key β-oxidation enzymes.
  • Short amino acid motifs were identified as necessary and sufficient for protein self-assembly into aggregates.
  • These motifs mediate core enrichment in vivo and are functional in mammalian cells.
  • Altering these motifs disrupts core assembly and affects peroxisome function during fatty acid challenges.

Conclusions:

  • Peroxisomal protein cores compartmentalize the organelle lumen, preventing biochemical reaction interference.
  • Self-assembly of specific proteins into cores allows for the generation of functionally distinct peroxisome subpopulations.
  • This mechanism of metabolic compartmentalization via protein assembly may be conserved across different organisms.