Photoinduced size change of membrane vesicles from bovine retinal rod outer segment

5 April 1977

journal article
research article
Published by American Chemical Society (ACS) in Biochemistry

Vol. 16 (7) , 1273-1278
https://doi.org/10.1021/bi00626a005

Abstract

Quasielastic light-scattering measurements were made on isolated, osmotically swollen, bovine rod outer segment (ROS) disk membranes in aqueous Ficoll. The translational diffusion coefficients determined were (1.66 .+-. 0.21) .times. 10-9 and (2.31 .+-. 0.14) .times. 10-9 cm2/s at 25.degree. C for the unbleached and bleached membranes in 5% Ficoll, respectively, yielding Stokes radii of 0.53 .+-. 0.07 .mu.m for the former and 0.38 .+-. 0.02 .mu.m for the latter. This photoinduced size decrease, which corresponds to a 60% decrease in the intravesicular volume, was far more pronounced than those reported by others for ROS fragments.

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