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Peroxisome biogenesis
1Department of Cell Biology and Anatomy, Mount Sinai School of Medicine, New York, NY 10029-6574, USA. edward.purdue@mssm.edu
Annual Review of Cell and Developmental Biology
|November 1, 2001
Summary
Peroxisome biogenesis relies on 23 PEX genes encoding peroxins for organelle assembly. Research clarifies matrix protein import and organelle proliferation, supporting conserved mechanisms across eukaryotes.
Area of Science:
- Cell Biology
- Genetics
- Biochemistry
Background:
- Peroxisome biogenesis was previously modeled as growth and division of existing organelles.
- The identification of 23 PEX genes has elucidated the protein machinery (peroxins) essential for peroxisome assembly.
Purpose of the Study:
- To detail the current understanding of peroxisome biogenesis, including membrane assembly, matrix protein import, and proliferation.
- To highlight the conserved nature of peroxisome biogenesis across eukaryotes and its relevance to human diseases.
Main Methods:
- Utilized genetically tractable model organisms and Chinese hamster ovary cells.
- Cloned and characterized 23 PEX genes encoding peroxins.
- Investigated protein import pathways and organelle proliferation mechanisms.
Main Results:
- Membrane assembly requires specific peroxins (3, 16, 19) and can occur independently of matrix enzyme import.
- Matrix protein import involves a branched pathway of soluble recycling receptors, with Pex5p cycling in and out of peroxisomes.
- Organelle proliferation is regulated by Pex11p, and peroxisome biogenesis is highly conserved.
Conclusions:
- The current model emphasizes the role of peroxins in peroxisome assembly and function.
- Peroxisome biogenesis diseases are linked to orthologs of yeast or Chinese hamster ovary peroxins.
- Evidence supports the continuity of the peroxisome compartment, challenging theories of de novo formation.