Effect of tunicamycin on the glycosylation of rhodopsin

The incorporation of [ 3H]glucosamine, [ 3H]mannose, and [ 35S]methionine into rhodopsin was investigated in retinas which had been incubated in the presence and absence of the antibiotic, tunicamycin. In its presence, the incorporation of glucosamine was inhibited 70% and mannose, 96% compared to c...

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Veröffentlicht in:Archives of biochemistry and biophysics 1980-05, Vol.201 (2), p.527-532
Hauptverfasser: Plantner, James J., Poncz, Louis, Kean, Edward L.
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container_end_page 532
container_issue 2
container_start_page 527
container_title Archives of biochemistry and biophysics
container_volume 201
creator Plantner, James J.
Poncz, Louis
Kean, Edward L.
description The incorporation of [ 3H]glucosamine, [ 3H]mannose, and [ 35S]methionine into rhodopsin was investigated in retinas which had been incubated in the presence and absence of the antibiotic, tunicamycin. In its presence, the incorporation of glucosamine was inhibited 70% and mannose, 96% compared to controls. In the presence of tunicamycin the attachment of glucosamine to core-region sites was virtually eliminated. The formation of unglycosylated rhodopsin was also indicated by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and concanavalin A-Sepharose chromatography. These findings are consistent with the participation of the lipid-linked pathway in the glycosylation of this well-characterized intrinsic glycoprotein of the membranes of the disk of the rod outer segment. As indicated by the incorporation of [ 35S]methionine, the synthesis of rhodopsin apoprotein was inhibited by a much lesser amount. This suggests that the glycosylation of rhodopsin is not required for its insertion into the disk membrane.
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source MEDLINE; Elsevier ScienceDirect Journals
subjects Animals
Cattle
Culture Techniques
Electrophoresis, Polyacrylamide Gel
Glucosamine - analogs & derivatives
Glucosamine - metabolism
Glycoproteins - biosynthesis
Mannose - metabolism
Membrane Proteins - biosynthesis
Methionine - metabolism
Retinal Pigments - metabolism
Rhodopsin - metabolism
Tunicamycin - pharmacology
title Effect of tunicamycin on the glycosylation of rhodopsin
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