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PMID:17360592

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Citation

Popescu, SC, Popescu, GV, Bachan, S, Zhang, Z, Seay, M, Gerstein, M, Snyder, M and Dinesh-Kumar, SP (2007) Differential binding of calmodulin-related proteins to their targets revealed through high-density Arabidopsis protein microarrays. Proc. Natl. Acad. Sci. U.S.A. 104:4730-5

Abstract

Calmodulins (CaMs) are the most ubiquitous calcium sensors in eukaryotes. A number of CaM-binding proteins have been identified through classical methods, and many proteins have been predicted to bind CaMs based on their structural homology with known targets. However, multicellular organisms typically contain many CaM-like (CML) proteins, and a global identification of their targets and specificity of interaction is lacking. In an effort to develop a platform for large-scale analysis of proteins in plants we have developed a protein microarray and used it to study the global analysis of CaM/CML interactions. An Arabidopsis thaliana expression collection containing 1,133 ORFs was generated and used to produce proteins with an optimized medium-throughput plant-based expression system. Protein microarrays were prepared and screened with several CaMs/CMLs. A large number of previously known and novel CaM/CML targets were identified, including transcription factors, receptor and intracellular protein kinases, F-box proteins, RNA-binding proteins, and proteins of unknown function. Multiple CaM/CML proteins bound many binding partners, but the majority of targets were specific to one or a few CaMs/CMLs indicating that different CaM family members function through different targets. Based on our analyses, the emergent CaM/CML interactome is more extensive than previously predicted. Our results suggest that calcium functions through distinct CaM/CML proteins to regulate a wide range of targets and cellular activities.

Links

PubMed PMC1838668 Online version:10.1073/pnas.0611615104

Keywords

Arabidopsis/genetics; Arabidopsis/metabolism; Calmodulin/chemistry; Calmodulin/metabolism; Computational Biology; Genes, Plant; Models, Genetic; Open Reading Frames; Phylogeny; Plant Proteins; Protein Array Analysis; Protein Binding; Protein Interaction Mapping; Proteins/chemistry; Proteomics/methods; Recombinant Proteins/chemistry

Significance

Annotations

Gene product Qualifier GO ID GO term name Evidence Code with/from Aspect Notes Status


See also

References

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