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Regulated Cell Death in Fungi, the Role of Metacaspases and Assay Techniques
1BIOCEV, Faculty of Science, Charles University, 128 00 Prague, Czech Republic.
Abstract:
Caspases orchestrate metazoan apoptosis, regulating processes such as embryogenesis, the death of old and infected cells and immune tolerance. Structural orthologs of caspases have been identified in bacteria, plants, protists and fungi and regulated cell death has been demonstrated in these organisms. This led some researchers to conclude that fungal metacaspases might perform a similar function to caspases. This review discusses regulated cell death, beginning with an account of RCD and the central role of caspases in mammalian RCD. It goes on to give examples of RCD in fungi, compares the structure and activity of caspase orthologs and outlines examples of metacaspase-dependent and metacaspase-independent cell death in fungi, focusing on S. cerevisiae. Finally, it addresses the question "are metacaspases caspases?", identifies alternative cell death proteases and recommends future research objectives.
Insights
Fungal metacaspases may not function like metazoan caspases in regulated cell death (RCD). This review explores RCD in fungi, comparing metacaspases and caspases to clarify their roles.
Area of Science:
- Cell Biology
- Molecular Biology
- Mycology
Background:
- Caspases are key proteases regulating metazoan apoptosis, crucial for development and homeostasis.
- Structural caspase orthologs exist in diverse eukaryotes and prokaryotes, prompting comparisons with fungal metacaspases.
- Regulated cell death (RCD) is a conserved biological process across different organisms.
Purpose of the Study:
- To review regulated cell death (RCD) in fungi.
- To compare fungal metacaspases with metazoan caspases.
- To investigate the function of metacaspases in fungal cell death pathways.
Main Methods:
- Literature review of RCD mechanisms.
- Comparative analysis of caspase and metacaspase structures and activities.
- Examination of metacaspase-dependent and independent cell death examples in fungi, particularly *S. cerevisiae*.
Main Results:
- Fungal metacaspases may not be direct functional analogs of metazoan caspases.
- Examples of both metacaspase-dependent and independent RCD pathways exist in fungi.
- Alternative proteases may contribute to RCD in fungi.
Conclusions:
- Metacaspases and caspases likely represent distinct evolutionary paths in RCD.
- Further research is needed to fully elucidate the roles of metacaspases and other proteases in fungal RCD.
- Clarifying the precise functions of fungal metacaspases is essential for understanding conserved and divergent cell death mechanisms.
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