An inhibitor of mannosylation of retinyl-phosphate. Issue 3 (March 1984)

• Record Type: Journal Article
• Authors: Datema, Roelf; Schwarz, Ralph T.
• Is Part Of: Bioscience reports. Volume 4:Issue 3(1984)
• Page Start: 213
• Page End: 221
• Publication Date: 1984-03
• Subjects: Molecular biology -- Periodicals; Cytology -- Periodicals; 572.8
• DOI: 10.1007/BF01119656
• Languages: English
• ISSNs: 0144-8463

Abstract

Abstract : The guanosine disphospate and uridine diphosphate esters of the antiviral sugar analog 2-deoxy-2-fluoro-D-glucose (GDP-FGlc and UDP-FGlc) were synthesized and tested as inhibitors of formation of lipid-linked sugars in cell-free extracts. Formation of dolichol-phosphate mannose and of dolichol-diphosphate di-N-acetylchitobiose were not inhibited by either sugar nucleotide. Formation of dolichol-phosphate glucose was inhibited by UDP-FGlc, not by GDP-FGlc. Although GDP-FGlc did not inhibit formation of dollchol-phosphate mannose, it did inhibit formation of retinol-phosphate mannose from retinol-phosphate and GDP-Man. This inhibition was not reversed by exogenous retinol-phosphate, nor was FGIc from GDP-FGlc incorporated into retinolphosphate-linked derivatives. As FGLc inhibits formation of dolichol-phosphate mannose in intact cells, but does not decrease pool sizes of GDP-Man and dolichol-phosphate (Datema et al., 1980, Eur. J. Biochem. 109, 331–341), we discuss that inhibition of formation of retinol-phosphate mannose by one of the metabolites of FGlc, namely GDP-FGlc, may lead to decreased synthesis of dolichol-phosphate mannose in FGlc-treated cells. This implies a role for vitamin A in the dolichol cycle of protein glycosylation.