Journal
JOURNAL OF BIOCHEMISTRY
Volume 139, Issue 3, Pages 391-398Publisher
OXFORD UNIV PRESS
DOI: 10.1093/jb/mvj039
Keywords
core fucosylation; endocytosis; Fut8; IGFBP-3; LRP-1
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alpha 1,6-Fucosyltransferase (Fut8) catalyzes the transfer of a fucose residue from GDP-fucose to the innermost N-acetylglucosamine residue of N-glycans. Here we report that the loss of core fucosylation impairs the function of low-density lipoprotein (LDL) receptor-related protein-1 (LRP-1), a multifunctional scavenger and signaling receptor, resulting in a reduction in the endocytosis of insulin like growth factor (IGF)-binding protein-3 (IGFBP-3) in the cells derived from Fut8-null (Fut8(-/-)) mice. The reduced endocytosis was restored by the re-introduction of Fut8. Serum levels of IGFBP-3 were markedly upregulated in Fut8(-/-) mice. These data clearly indicate that core fucosylation is crucial for the scavenging activity of LRP-1 in vivo.
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