Abstract
The calmodulin-binding domain of myristoylated alanine-rich C kinase substrate (MARCKS), which interacts with various targets including calmodulin, actin and membrane lipids, has been suggested to function as a crosstalk point among several signal transduction pathways. We present here the crystal structure at 2 Å resolution of a peptide consisting of the MARCKS calmodulin (CaM)-binding domain in complex with Ca2+-CaM. The domain assumes a flexible conformation, and the hydrophobic pocket of the calmodulin N-lobe, which is a common CaM-binding site observed in previously resolved Ca2+-CaM–target peptide complexes, is not involved in the interaction. The present structure presents a novel target-recognition mode of calmodulin and provides insight into the structural basis of the flexible interaction module of MARCKS.
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Acknowledgements
We are grateful to M. Yamamoto and T. Kumasaka for X-ray diffraction data collection and data processing at beamline BL45XU-SAX. We thank O. de Montellano for providing the human CaM cDNA. This work was supported by Grants-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology of Japan and by the Japan Society for the Promotion of Science.
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Yamauchi, E., Nakatsu, T., Matsubara, M. et al. Crystal structure of a MARCKS peptide containing the calmodulin-binding domain in complex with Ca2+-calmodulin. Nat Struct Mol Biol 10, 226–231 (2003). https://doi.org/10.1038/nsb900
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DOI: https://doi.org/10.1038/nsb900
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