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Serpins in rice: protein sequence analysis, phylogeny and gene expression during development
Sheila E Francis1, Renan A Ersoy, Joon-Woo Ahn
1Department of Chemistry and Biomolecular Sciences, Macquarie University, NSW, Australia.
BMC Genomics
|September 6, 2012
Summary
Plant serpins, key regulators in animals, have diverse functions in rice. This study reveals varied reactive-center sequences and expression patterns, suggesting roles in plant regulation and defense.
Area of Science:
- Plant molecular biology
- Proteomics
- Genomics
Background:
- Serpins are crucial proteinase inhibitors in animals, regulating diverse physiological processes.
- Plant serpins' functions and genomic complement remain largely uncharacterized.
Purpose of the Study:
- To investigate the diversity and evolutionary relationships of serpin genes in rice (Oryza sativa).
- To analyze the expression patterns of rice serpins across different developmental stages and tissues.
- To establish a functional nomenclature for plant serpins.
Main Methods:
- Bioinformatic analysis of 14 rice serpin sequences.
- Phylogenetic analysis to determine evolutionary relationships.
- Transcriptional analysis of selected rice serpin genes in various tissues and developmental stages.
Main Results:
- Identified 14 full-length serpins in rice with diverse reactive-center sequences, differing from Arabidopsis serpins.
- Developed a new nomenclature incorporating reactive-center sequences for plant serpins.
- Phylogenetic analysis revealed two main clades and recent gene duplications.
- Observed significant variations in basal expression levels of eight selected serpin genes across different tissues and developmental stages.
- OsSRP-LRS and OsSRP-PLP showed high and ubiquitous/conserved expression, respectively.
Conclusions:
- The diverse reactive-center sequences suggest rice serpins target a range of proteases with distinct specificities.
- Differential expression patterns indicate varied roles for rice serpins in plant regulation and defense mechanisms.
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