Abstract
Half-lives and rate constants of degradation of protein-bound fucose have been determined in plasma membranes and total cell homogenates of rat liver and Morris hepatoma 7777. The existence of at least two dynamically different classes of fucose-containing glycoproteins could be demonstrated in both liver and hepatoma plasma membranes. The apparent half-lives were 8.4 and 24.5 h (host liver) and 11.5 and 33.9 h (Morris hepatoma). Since this biphasic loss of fucose residues was not observed for sialic acid [Harms & Reutter (1974) Cancer Res. 34, 3165--3172], the differences are possibly related to specific functions of fucosylated glycoproteins of the plasma membrane.
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Selected References
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