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1 Acta Biochimica Polonica

1 1998

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Dolichyl sulphate and H-phosphonate: Enzymatic reactions with activated sugars

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Sizova O. V. , Maltsev S. D. , Shibaev V. N. , Jankowski W. J. , Chojnacki T.

Acta Biochimica Polonica

1998

tom 45

nr 4

Two phosphate-modified analogues of dolichyl phosphate were evaluated as substrates or inhibitors of the reactions catalyzed by mammalian microsomal enzymes. Dolichyl H-phosphonate could serve as an efficient acceptor for mannosyl and glucosyl transfer. The reaction products were chromatographically different from those formed from dolichyl phosphate. Lower activity of the H-phosphonate was observed for the reaction of N-acetylglucosaminyl phosphate transfer from UDP-GlcNAc. Dolichyl sulphate was shown not to serve as a substrate for the transfer of mannosyl (from GDP-Man), glucosyl (from UDP-Glc) or N-acetylglucosaminyl phosphate (from UDP-GlcNAc) residues in the presence of rat liver microsomes. Weak inhibitory properties of this analogue were demonstrated.