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Morphological, immunological and biochemical characterization of purified transverse tubule membranes isolated from rabbit skeletal muscle

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Summary

A microsomal fraction consisting of membranes of transverse tubule origin has been purified by a modification of the calcium-loading procedure initially described by Rosemblatt et al. (J Biol Chem 256:8140–8, 1981). Enzymatic analysis of this fraction shows an enrichment of the vesicles in the Mg++ATPase (basal) activity characteristic of the T-tubules and an absent or very low Ca++-dependant ATPase activity. Stereological analysis of freeze fracture replica of the membranes in the purified fraction indicates that they have a very low density of particles in their P faces and lack the structural manifestation of the caveolae typical of the sarcolemma. Immunological analysis performed with monoclonal antibodies prepared against purified T-tubule and sarcoplasmic reticulum membranes define some T-tubule specific antigens and confirm the morphological and biochemical data regarding the origin and purity of the Ttubule preparation.

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Rosemblatt, M.S., Scales, D.J. Morphological, immunological and biochemical characterization of purified transverse tubule membranes isolated from rabbit skeletal muscle. Mol Cell Biochem 87, 57–69 (1989). https://doi.org/10.1007/BF00421083

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  • DOI: https://doi.org/10.1007/BF00421083

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