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Immunocytochemical Localization and Crystal Structure of Human Frequenin (Neuronal Calcium Sensor 1)

Abstract : Frequenin, a member of a large family of myristoylswitch calcium-binding proteins, functions as a calciumion sensor to modulate synaptic activity and secretion. We show that human frequenin colocalizes with ARF1 GTPase in COS-7 cells and occurs in similar cellular compartments as the phosphatidylinositol-4-OH kinase PI4K␤, the mammalian homolog of the yeast kinase PIK1. In addition, the crystal structure of unmyristoylated, calcium-bound human frequenin has been determined and refined to 1.9 Å resolution. The overall fold of frequenin resembles those of neurocalcin and the photoreceptor, recoverin, of the same family, with two pairs of calcium-binding EF hands and three bound calcium ions. Despite the similarities, however, frequenin displays significant structural differences. A large conformational shift of the C-terminal region creates a wide hydrophobic crevice at the surface of frequenin. This crevice, which is unique to frequenin and distinct from the myristoyl-binding box of recoverin, may accommodate a yet unknown protein ligand.
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Submitted on : Thursday, June 17, 2021 - 8:42:51 AM
Last modification on : Friday, January 21, 2022 - 12:26:01 PM
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Yves Bourne, Jens Dannenberg, Verena Pollmann, P. Marchot, Olaf Pongs. Immunocytochemical Localization and Crystal Structure of Human Frequenin (Neuronal Calcium Sensor 1). Journal of Biological Chemistry, 2000, 276, pp.11949 - 11955. ⟨10.1074/jbc.m009373200⟩. ⟨hal-03263149⟩



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