Abstract
The crystal structure of the core domain (N-terminal 30 kDa domain) of cytoskeletal protein 4.1R has been determined and shows a cloverleaf-like architecture. Each lobe of the cloverleaf contains a specific binding site for either band 3, glycophorin C/D or p55. At a central region of the molecule near where the three lobes are joined are two separate calmodulin (CaM) binding regions. One of these is composed primarily of an α-helix and is Ca2+ insensitive; the other takes the form of an extended structure and its binding with CaM is dramatically enhanced by the presence of Ca2+, resulting in the weakening of protein 4.1R binding to its target proteins. This novel architecture, in which the three lobes bind with three membrane associated proteins, and the location of calmodulin binding sites provide insight into how the protein 4.1R core domain interacts with membrane proteins and dynamically regulates cell shape in response to changes in intracellular Ca2+ levels.
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Acknowledgements
This work was supported by the Director, Office of Science, Office of Biological and Environment Research, Life Sciences Division, of the U.S. Department of Energy (DOE), by National Institutes of Health (NIH) Research grants and by the Ministry of Education of Japan. We also thank the staff at the ALS beam line 5.0.2 and the NSLS beam line X25 for their assistance during data collection. The synchrotron facilities are supported by DOE (ALS and NSLS) and NIH (NSLS). We are thankful to P.J. Walian for helpful discussions and critical reading of the manuscript.
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Han, BG., Nunomura, W., Takakuwa, Y. et al. Protein 4.1R core domain structure and insights into regulation of cytoskeletal organization. Nat Struct Mol Biol 7, 871–875 (2000). https://doi.org/10.1038/82819
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DOI: https://doi.org/10.1038/82819
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