Different turnover of fucose residues in plasma membranes of rat liver and Morris hepatoma 7777.
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.
D000818:Animals; D002462:Cell Membrane / Q000378:metabolism; D005643:Fucose / Q000378:metabolism*; D006023:Glycoproteins / Q000378:metabolism; D006207:Half-Life; D007700:Kinetics; D008099:Liver / Q000378:metabolism*; D008114:Liver Neoplasms, Experimental / Q000378:metabolism*; D008297:Male; D008565:Membrane Proteins / Q000378:metabolism; D051381:Rats
D006023:Glycoproteins; D008565:Membrane Proteins; D005643:Fucose