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Ca(2+)/Calmodulin-binding proteins from the C. elegans proteome.

Shen X., Valencia C.A., Gao W., Cotten S.W., Dong B., Huang B.C., Liu R.

Calmodulin (CaM) is the primary Ca(2+)-sensor that regulates a wide variety of cellular processes in eukaryotes. Although many Ca(2+)/CaM-binding proteins have been identified, very few such proteins could be found from the genome-wide protein-protein interaction maps of Caenorhabditis elegans constructed by yeast two-hybrid screening. Using a genotype-phenotype conjugation method called mRNA-display, we performed a selection for Ca(2+)/CaM-binding proteins from a proteome library of C. elegans. The method allowed the identification of 9 known and 47 previously uncharacterized Ca(2+)-dependent CaM-binding proteins from the adult worm proteome. The Ca(2+)/CaM-binding properties of these proteins were characterized and their binding motifs were identified. The availability of such information could facilitate our understanding of the signaling pathways mediated by Ca(2+)/CaM in C. elegans. Due to its simplicity and efficiency, the method could be readily applied to examine the Ca(2+)-dependent binding partners of numerous other Ca(2+)-binding proteins, which may play important roles in many signaling pathways in C. elegans.

Cell Calcium 43:444-456(2008) [PubMed] [Europe PMC]

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