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Serpins in plants and green algae.
Thomas H Roberts1, Jørn Hejgaard
1Department of Chemistry and Biomolecular Sciences, Macquarie University, North Ryde, NSW 2109, Australia. troberts@els.mq.edu.au
Functional & Integrative Genomics
|December 7, 2007
Summary
Plant serpins regulate proteolysis, crucial for plant growth and defense. Despite inhibiting mammalian enzymes, their specific roles and evolutionary links, especially with algae, require further investigation.
Area of Science:
- Plant Biology
- Biochemistry
- Evolutionary Biology
Background:
- Proteolysis control is vital for plant growth, development, stress responses, and defense.
- Serpins are key regulators of proteolysis, inhibiting target proteinases.
- Plant serpins form a distinct group, with evolutionary links to green algae serpins remaining unclear.
Purpose of the Study:
- To review current knowledge on plant serpins, including sequence diversity, inhibitory specificity, gene expression, and function.
- To explore the evolutionary relationships of plant serpins with those in other organisms.
- To highlight the potential roles of plant serpins in regulating endogenous proteinases.
Main Methods:
- Phylogenetic analysis of expressed plant serpin amino acid sequences.
- Delineation of plant serpin gene structures.
- Prediction of inhibitory specificities based on reactive center identification.
Main Results:
- Plant serpins exhibit sequence diversity and a distinct phylogenetic position.
- While potent inhibitors of mammalian serine proteinases in vitro, plants lack these targets.
- An Arabidopsis serpin has been shown to inhibit an endogenous cysteine proteinase.
Conclusions:
- Plant serpins are important regulators of proteolysis, potentially targeting endogenous cysteine proteinases.
- Further research is needed to fully elucidate the functions and evolutionary history of plant serpins.
- Understanding plant serpins can advance knowledge of plant defense and developmental mechanisms.
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