Rapid Lateral Diffusion of Phospholipids in Rabbit Sarcoplasmic Reticulum

  1. Carl J. Scandella*,
  2. Philippe Devaux†, and
  3. Harden M. McConnell‡
  1. Stauffer Laboratory for Physical Chemistry, Stanford, California 94305

Abstract

Phospholipid spin labels incorporated in the sarcoplasmic reticulum from rabbit-skeletal muscle undergo rapid lateral diffusion within the plane of the membrane. The diffusion constant, D, is 6×10-8 cm2/sec at 37°. With this diffusion constant, a phospholipid molecule can diffuse a distance of the order of 5000 nm in 1 sec.

Footnotes

  • ↵ * Present address: Biocenter, University of Basel, Klingelbergstrasse 70, CH 4056, Basel, Switzerland.

  • ↵ † On leave from Laboratoire de Physique des Solides, Faculté des Science de Paris.

  • ↵ ‡ To whom to address correspondence.

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  1. PNAS 1972-08 vol. 69 no. 8 2056-2060
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