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Journal of Lipid Research, Vol. 8, 245-248, May 1967
Copyright © 1967 by Lipid Research, Inc.

Effect of light on extraction of lipid from retinal rods

Ralph G. Adams

Laboratory of Physical Biology, National Institute of Arthritis and Metabolic Diseases, Bethesda, Maryland 20014

Chloroform-methanol 2:1 removes a significantly greater quantity of lipid from bleached bovine retinal rods than from a dark-adapted counterpart. The extracts contain phosphatidyl serine, phosphatidyl choline, phosphatidyl ethanolamine, sphingomyelin, and an unknown substance which, it is proposed, may be a combination of phospholipid and retinaldehyde. The difference between extracts of light-and dark-adapted rods is quantitative rather than qualitative.

The data tend to confirm a model of rhodopsin suggested by Kropf and Hubbard in which isomerization of the retinaldehyde chromophore causes its displacement and opens a path to the interior of the molecule.

Supplementary key words bovine • retinal rods • light- and dark-adapted • extraction • chloroform-methanol • phospholipid • retinaldehyde • rhodopsin

Submitted on September 14, 1966
Accepted on January 30, 1967

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