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An evolutionary puzzle: chloroplast and mitochondrial division rings
Shin-ya Miyagishima1, Keiji Nishida, Tsuneyoshi Kuroiwa
1Department of Life Science, College of Science, Rikkyo (St Paul's) University, 3-34-1 Nishiikebukuro, Toshima-ku, Tokyo 171-8501, Japan. z2002376@rikkyo.ne.jp
Trends in Plant Science
|September 19, 2003
Summary
Chloroplast and mitochondria division involves bacterial FtsZ rings and distinct eukaryote-specific dynamin-related GTPase rings. This suggests a hybrid system for organelle division, merging bacterial and eukaryotic components.
Area of Science:
- Cell Biology
- Organelle Biology
- Evolutionary Biology
Background:
- Chloroplasts and mitochondria, originating from bacteria, retain FtsZ rings for division.
- Organelle division machinery has evolved, losing bacterial proteins but gaining new components.
- Eukaryote-specific dynamin-related GTPases regulate organelle division.
Purpose of the Study:
- To investigate the division mechanisms of chloroplasts and primitive mitochondria.
- To understand the roles of FtsZ rings and dynamin-related GTPases in organelle division.
- To elucidate the evolutionary origins of organelle division systems.
Main Methods:
- Comparative analysis of protein homologues across different species.
- Investigation of FtsZ ring and plastid/mitochondrion dividing ring functions.
- Study of dynamin-related GTPase involvement in chloroplast and mitochondrial division.
Main Results:
- Chloroplasts and mitochondria utilize both FtsZ rings and distinct organelle-specific dividing rings.
- Eukaryote-specific dynamin-related GTPases are crucial for regulating organelle division.
- These division systems appear conserved early in eukaryotic evolution.
Conclusions:
- Organelle division in eukaryotes involves a hybrid system.
- This system combines bacterial-derived components (FtsZ) with eukaryote-specific proteins (dynamin-related GTPases).
- The division machinery for chloroplasts and primitive mitochondria is remarkably similar.