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Topography of opsin within disk and plasma membranes revealed by a rapid-freeze deep-etch technique

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Journal of Neurocytology

Summary

Rod outer segments in fresh rat retinas were examined by a rapid-freeze, deep-etch technique to explore how membrane proteins are organized at the macromolecular level. Cross-fractures revealed that intradiscal membranes are adherent to each other except at the rim. When an isolated fresh retina was incubated in a hypotonic solution for a few minutes, the interdiscal space was expanded and the cytoplasmic surface of the disk membrane was found to be covered with protrusions except at the rim. A few particles were scattered among the protrusions and were attached to the cytoplasmic surface. Since the distribution density of the cytoplasmic surface protrusions was similar to that of the P-face particles, which are known to reflect opsins, the protrusions were considered to be portions of opsins extending into the cytoplasm. The intradiscal surfaces in chemically-fixed retinas were rather smooth and were labelled with anti-opsin antibodies and wheat germ agglutinin. The true surfaces of the plasma membrane were found to be similar in fine structure to those of the disk.

A model of the macromolecular organization of rod outer segments is proposed on the basis of these observations. The model shows apposed opsins within a disk membrane adhering to one another except at the rim. These opsins, as well as those in the plasma membrane, are minimally exposed to the extracellular surface, but protrude deeply into the cytoplasm.

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Authors and Affiliations

  1. Department of Anatomy, Osaka University Medical School, 2-2 Yamadaoka, Suita, 565, Osaka, Japan

    K. Miyaguchi & P. H. Hashimoto

  2. Department of Pharmacology, Osaka University Medical School, 2-2 Yamadaoka, Suita, 565, Osaka, Japan

    C. -H. Kuo & N. Miki

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  1. K. Miyaguchi
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  2. C. -H. Kuo
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  3. N. Miki
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  4. P. H. Hashimoto
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Miyaguchi, K., Kuo, C.H., Miki, N. et al. Topography of opsin within disk and plasma membranes revealed by a rapid-freeze deep-etch technique. J Neurocytol 21, 807–819 (1992). https://doi.org/10.1007/BF01237906

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  • DOI: https://doi.org/10.1007/BF01237906

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