title: Regulation of the skeletal muscle ryanodine receptor/Ca2+-release channel RyR1 by S-palmitoylation.
abstract: The ryanodine receptor/Ca(2+)-release channels (RyRs) of skeletal and cardiac muscle are essential for Ca(2+) release from the sarcoplasmic reticulum that mediates excitation-contraction coupling. It has been shown that RyR activity is regulated by dynamic post-translational modifications of Cys residues, in particular S-nitrosylation and S-oxidation. Here we show that the predominant form of RyR in skeletal muscle, RyR1, is subject to Cys-directed modification by S-palmitoylation. S-Palmitoylation targets 18 Cys within the N-terminal, cytoplasmic region of RyR1, which are clustered in multiple functional domains including those implicated in the activity-governing protein-protein interactions of RyR1 with the L-type Ca(2+) channel CaV1.1, calmodulin, and the FK506-binding protein FKBP12, as well as in "hot spot" regions containing sites of mutations implicated in malignant hyperthermia and central core disease. Eight of these Cys have been identified previously as subject to physiological S-nitrosylation or S-oxidation. Diminishing S-palmitoylation directly suppresses RyR1 activity as well as stimulus-coupled Ca(2+) release through RyR1. These findings demonstrate functional regulation of RyR1 by a previously unreported post-translational modification and indicate the potential for extensive Cys-based signaling cross-talk. In addition, we identify the sarco/endoplasmic reticular Ca(2+)-ATPase 1A and the α1S subunit of the L-type Ca(2+) channel CaV1.1 as S-palmitoylated proteins, indicating that S-palmitoylation may regulate all principal governors of Ca(2+) flux in skeletal muscle that mediates excitation-contraction coupling.
authors: From the Institute for Transformative Molecular Medicine and Department of Medicine, Case Western Reserve University School of Medicine and University Hospitals, Cleveland, Ohio 44106.
authors: Ruchi
authors: R
authors: Chaube
authors: Douglas T
authors: DT
authors: Hess
authors: Ya-Juan
authors: YJ
authors: Wang
authors: Bradley
authors: B
authors: Plummer
authors: Qi-An
authors: QA
authors: Sun
authors: Kennneth
authors: K
authors: Laurita
authors: Jonathan S
authors: JS
authors: Stamler
mesh_terms: D000818:Animals; D002118:Calcium / Q000378:metabolism*; D002478:Cells, Cultured; D006801:Humans; D051379:Mice; D008810:Mice, Inbred C57BL; D018482:Muscle, Skeletal / Q000378:metabolism*; D019308:Palmitic Acid / Q000737:chemistry / Q000378:metabolism*; D011499:Protein Processing, Post-Translational; D011817:Rabbits; D019837:Ryanodine Receptor Calcium Release Channel / Q000737:chemistry / Q000378:metabolism*
chemical_list: D019837:Ryanodine Receptor Calcium Release Channel; D019308:Palmitic Acid; D002118:Calcium
keywords: Calcium Intracellular Release; Post-translational Modification; Protein Palmitoylation; Ryanodine Receptor; Skeletal Muscle