DHRSX is required for two steps in the biosynthesis of dolichol: i) the NAD+-dependent conversion of polyprenol to its aldehyde analogue, polyprenal; ii) the NADPH-dependent reduction of dolichal to dolichol.[6] Dolichol is a long polyisoprenoid lipid required as the carrier of mono- and oligosaccharides in the processes of N-glycosylation, C-/O-mannosylation and the formation of glycosylphosphatidylinositol (GPI) anchors.
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