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• W2024882039 abstract "Recoverin, a new member of the EF-hand superfamily, plays a critical role in the light/dark adaptation of retinal rods by regulating rhodopsin phosphorylation in a Ca2+-dependent manner. Recoverin is composed of four isoforms, each of which is modified at its N terminus by myristate (C14:0) or its structurally related fatty acid (C12:0, C14:2, or C14:1). Although the N-fatty acylation is implicated in protein-membrane and protein-protein interactions, the functional difference among the recoverin isoforms and the significance of the heterogeneous acylation have not been defined. Here we separated the heterogeneous recoverin into three fractions, C14:0-recoverin, C14:1-recoverin, and a mixture of C14:2- and C12:0- (C14:2/C12:0-) recoverin to evaluate the individual properties. Recoverin in every fraction bound Ca2+ as assessed by fluorescence spectroscopy and inhibited the light-dependent rhodopsin phosphorylation in the same range of free Ca2+ concentration (0.3-0.8 μM). However, the magnitude of the inhibition at higher Ca2+ concentration was different among the isoforms and ranked in the same order of the hydrophobicity of the N-fatty acyl groups: C14:0 > C14:1 > C14:2/C12:0. These results indicate that the diverged hydrophobicity of the recoverin N terminus plays an important role in the interaction with the membranes and/or its target protein but not with Ca2+. Recoverin, a new member of the EF-hand superfamily, plays a critical role in the light/dark adaptation of retinal rods by regulating rhodopsin phosphorylation in a Ca2+-dependent manner. Recoverin is composed of four isoforms, each of which is modified at its N terminus by myristate (C14:0) or its structurally related fatty acid (C12:0, C14:2, or C14:1). Although the N-fatty acylation is implicated in protein-membrane and protein-protein interactions, the functional difference among the recoverin isoforms and the significance of the heterogeneous acylation have not been defined. Here we separated the heterogeneous recoverin into three fractions, C14:0-recoverin, C14:1-recoverin, and a mixture of C14:2- and C12:0- (C14:2/C12:0-) recoverin to evaluate the individual properties. Recoverin in every fraction bound Ca2+ as assessed by fluorescence spectroscopy and inhibited the light-dependent rhodopsin phosphorylation in the same range of free Ca2+ concentration (0.3-0.8 μM). However, the magnitude of the inhibition at higher Ca2+ concentration was different among the isoforms and ranked in the same order of the hydrophobicity of the N-fatty acyl groups: C14:0 > C14:1 > C14:2/C12:0. These results indicate that the diverged hydrophobicity of the recoverin N terminus plays an important role in the interaction with the membranes and/or its target protein but not with Ca2+." @default.
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• W2024882039 date "1995-06-01" @default.
• W2024882039 modified "2023-10-17" @default.
• W2024882039 title "Role of Heterogeneous N-terminal Acylation of Recoverin in Rhodopsin Phosphorylation" @default.
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• W2024882039 doi "https://doi.org/10.1074/jbc.270.26.15459" @default.
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