Journal of Muscle Research & Cell Motility

, Volume 13, Issue 5, pp 497–510 | Cite as

Giant sarcoplasmic reticulum vesicles: A study of membrane morphogenesis

  • Sandor Varga
  • Anthony Martonosi
Papers

Summary

Rabbit sarcoplasmic reticulum vesicles were fused into giant proteoliposomes in a medium of 0.1 M KCl, 10mm Tris-maleate, pH 7.0, 10 Μg ml−1 antipain, 10 Μg ml−1 leupeptin, 25 IU per ml Trasylol, 3mm NaN3, 3.75% PEG 1500 and 3% DMSO by brief exposure to 37‡ C, followed by incubation for 4 h at 25‡ C. Approximately 5–10% of the sarcoplasmic reticulum elements underwent fusion, forming single-walled spherical vesicles of 1–25 Μm diameter, in which the polarity of the native membrane was preserved. The Ca2+-stimulated ATPase activity remained essentially unchanged after fusion. On exposure to decavanadate in a Ca2+-free medium the spherical vesicles assumed a corrugated appearance with the formation of long ridges separated by deep furrows that eventually pinched off longitudinally and separated into numerous long crystalline tubules of uniform (approximately 0.1 Μm) diameter. The vanadate-induced transformation of giant vesicles into tubules implies that the geometry of the sarcoplasmic reticulum membrane is determined by the conformation of the Ca2+-ATPase.

Keywords

ATPase Activity Sarcoplasmic Reticulum Free Medium Native Membrane Trasylol 

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Copyright information

© Chapman & Hall 1992

Authors and Affiliations

  • Sandor Varga
    • 1
  • Anthony Martonosi
    • 1
  1. 1.Department of Biochemistry and Molecular BiologyState University of New York, Health Science CenterSyracuseUSA

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