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Genes encoding calmodulin-binding proteins in the Arabidopsis genome
Vaka S Reddy1, Gul S Ali, Anireddy S N Reddy
1Department of Biology and Program in Cell and Molecular Biology, Colorado State University, Fort Collins, Colorado 80523, USA. reddy@lamar.colostate.edu
The Journal of Biological Chemistry
|January 10, 2002
Summary
Researchers identified 27 calmodulin-binding proteins (CBPs) in Arabidopsis, including 14 novel ones, revealing a large number of plant-specific proteins involved in calcium-mediated signaling. This expands our understanding of plant cellular processes.
Area of Science:
- Plant molecular biology
- Genomics
- Biochemistry
Background:
- Calmodulin (CaM) is a crucial Ca(2+) sensor regulating diverse cellular processes.
- CaM-binding domains (CBDs) lack conserved sequences, complicating identification of CaM-binding proteins (CBPs).
- Approximately 31% of Arabidopsis genes lack known functions, suggesting many uncharacterized proteins exist.
Purpose of the Study:
- To identify CaM-binding proteins (CBPs) in the Arabidopsis genome.
- To characterize the diversity and expression patterns of Arabidopsis CBPs.
- To explore the role of CBPs in calcium-mediated signaling networks.
Main Methods:
- Protein-protein interaction-based screening of Arabidopsis expression libraries using radiolabeled CaM.
- Sequence analysis of positive clones interacting with CaM in a Ca(2+)-dependent manner.
- Genome-wide search for CBPs using known plant and animal CBP sequences.
Main Results:
- Identified 27 CBPs in Arabidopsis, including 14 novel proteins.
- Found that 16 CBPs belong to multi-member families.
- Observed differential gene expression of CBPs and their paralogs.
- Discovered that most plant CBPs are plant-specific, with few commonalities to animal CBPs.
Conclusions:
- Arabidopsis possesses a substantial repertoire of CBPs, including numerous plant-specific ones.
- Identified hypothetical proteins as potential CaM targets, implicating them in Ca(2+)-mediated signaling.
- The study provides insights into the complexity of Ca(2+)-dependent regulation in plants.