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Localization of rhodopsin in isolated, osmotically intact rod outer segment discs

DI Blaustein and MM Dewey

Localization of rhodopsin and its position in the membrane has been the subject of numerous studies. Most recently, immunocytochemical techniques have been employed to localize the opsin component of the molecule in in situ rod outer segments. Due to the problems inherent in localization procedures (penetration and mechanical interference) we have utilized isolated, osmotically intact rod outer segment discs in this study. Specific antibodies to chromatographically pure rhodopsin were prepared and enzymatically digested to their Fab components. The univalent Fab antibodies were conjugated to horseradish peroxidase and used to label the isolated rod outer segment discs. Discs treated with anti-opsin conjugate stained uniformly and heavily on their interdisc surfaces. Reaction product was also present on the intradisc surface in a thinner but still uniformly distributed layer. Controls treated with preimmune Fab - horseradish peroxidase conjugate showed no deposition of reaction product.

Volume 27, Issue 3, pp. 788-793, 03/01/1979
Copyright © 1979 by The Histochemical Society


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