SRP-27 is a novel component of the supramolecular signalling complex involved in skeletal muscle excitation-contraction coupling

Bleunven, Christophe and Treves, Susan and Jinyu, Xia and Leo, Elisa and Ronjat, Michel and De Waard, Michel and Kern, Georg and Flucher, Bernhard E. and Zorzato, Francesco. (2008) SRP-27 is a novel component of the supramolecular signalling complex involved in skeletal muscle excitation-contraction coupling. Biochemical Journal, 411 (2). pp. 343-349.

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Official URL: http://edoc.unibas.ch/dok/A6174309

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SRP-27 (sarcoplasmic reticulum protein of 27 kDa) is a newly identified integral membrane protein constituent of the skeletal muscle SR (sarcoplasmic reticulum). We identified its primary structure from cDNA clones isolated from a mouse skeletal muscle cDNA library. ESTs (expressed sequence tags) of SRP-27 were found mainly in cDNA libraries from excitable tissues of mouse. Western blot analysis confirmed the expression of SRP-27 in skeletal muscle and, to a lower extent, in heart and brain. Mild trypsin proteolysis combined with primary-structure prediction analysis suggested that SRP-27 has four transmembrane-spanning alpha helices and its C-terminal domain faces the cytoplasmic side of the endo(sarco)plasmic reticulum. The expression of SRP-27 is higher in fast twitch skeletal muscles compared to slow twitch muscles and peaks during the first month of post-natal development. High-resolution immunohistochemistry and Western blot analysis of subcellular fractions indicated that SRP-27 is distributed in both longitudinal tubules and terminal cisternae of the SR, as well as in the perinuclear membrane systems and the nuclear envelope of myotubes and adult fibres. SRP-27 co-sediments with the RyR (ryanodine receptor) macromolecular complex in high-salt sucrose-gradient centrifugation, and is pulled-down by anti-RyR as well as by maurocalcin, a well characterized RyR modulator. Our results indicate that SRP-27 is part of a SR supramolecular complex, suggesting the involvement of SRP-27 in the structural organization or function of the molecular machinery underlying excitation-contraction coupling.
Faculties and Departments:03 Faculty of Medicine > Departement Biomedizin > Department of Biomedicine, University Hospital Basel > Perioperative Patient Safety (Girard/Treves)
UniBasel Contributors:Treves, Susan
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Portland Press
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:31 May 2017 10:40
Deposited On:25 Oct 2013 08:33

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