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Dual targeting to mitochondria and chloroplasts
1Department of Molecular Biology and Genetics, Cornell University, Ithaca, NY 14853-2703, USA. nmp23@cornell.edu
Biochimica Et Biophysica Acta
|December 26, 2001
Summary
Mitochondria and plastids, organelles in plant cells, have unique dual-targeting proteins. This review explores common features of these proteins, suggesting they are more prevalent than previously believed.
Area of Science:
- Cell Biology
- Molecular Biology
- Plant Science
Background:
- Plant cells possess mitochondria and plastids, organelles with bacterial endosymbiotic origins.
- These organelles retain their own DNA, encoding a limited number of genes.
- Many organelle-specific genes have migrated to the nuclear genome, with proteins re-imported into organelles.
Purpose of the Study:
- To review and analyze proteins targeted to both mitochondria and plastids.
- To identify common characteristics of these dual-targeted proteins.
- To understand factors influencing organelle targeting specificity.
Main Methods:
- Comparative analysis of existing literature on dual-targeted proteins.
- Discussion of identified examples of proteins imported into both mitochondria and plastids.
- Identification of potential common features and targeting mechanisms.
Main Results:
- An increasing number of proteins are found to be imported into both mitochondria and plastids.
- Specific protein features or targeting signals may facilitate dual organelle import.
- Dual targeting might be a more common phenomenon than previously recognized.
Conclusions:
- Dual-targeted proteins share common characteristics that enable import into both mitochondria and plastids.
- Understanding dual targeting provides insights into the evolution and regulation of organelle protein import.
- The prevalence of dual-targeted proteins may be underestimated in plant cell biology.