Document Detail


Core fucosylation of N-linked glycans in leukocyte adhesion deficiency/congenital disorder of glycosylation IIc fibroblasts.
MedLine Citation:
PMID:  15917429     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Leukocyte adhesion deficiency/congenital disorder of glycosylation IIc (LAD II/CDG IIc) is a genetic disease characterized by a decreased expression of fucose in glycoconjugates, resulting in leukocyte adhesion deficiency and severe morphological and neurological abnormalities. The biochemical defect is a reduced transport of guanosine diphosphate-L-fucose (GDP-L-fucose) from cytosol into the Golgi compartment, which reduces its availability as substrate for fucosyltransferases. The aim of this study was to determine the effects of a limited supply of GDP-L-fucose inside the Golgi on core fucosylation (alpha1,6-fucose linked to core N-acetylglucosamine [GlcNAc]) of N-linked glycans in LAD II fibroblasts. The results showed that, although [3H]fucose incorporation was generally reduced in LAD II cells, core fucosylation was affected to a greater extent compared with other types of fucosylation of N-linked oligosaccharides. In particular, core fucosylation was found to be nearly absent in biantennary negatively charged oligosaccharides, whereas other types of structures, in particular triantennary neutral species, were less affected by the reduction. Expression and activity of alpha1,6-fucosyltransferase (FUT8) in control and LAD II fibroblasts were comparable, thus excluding the possibility of a decreased activity of the transferase. The data obtained confirm that the concentration of GDP-L-fucose inside the Golgi can differentially affect the various types of fucosylation in vivo and also indicate that core fucosylation is not dependent only on the availability of GDP-L-fucose, but it is significantly influenced by the type of oligosaccharide structure. The relevant reduction in core fucosylation observed in some species of oligosaccharides could also provide clues for the identification of glycans involved in the severe developmental abnormalities observed in LAD II.
Authors:
Laura Sturla; Floriana Fruscione; Katsuhisa Noda; Eiji Miyoshi; Naoyuki Taniguchi; Paola Contini; Michela Tonetti
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2005-05-25
Journal Detail:
Title:  Glycobiology     Volume:  15     ISSN:  0959-6658     ISO Abbreviation:  Glycobiology     Publication Date:  2005 Oct 
Date Detail:
Created Date:  2005-09-21     Completed Date:  2006-01-31     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9104124     Medline TA:  Glycobiology     Country:  England    
Other Details:
Languages:  eng     Pagination:  924-34     Citation Subset:  IM    
Affiliation:
Department of Experimental Medicine,and Center of Excellence for Biomedical Research, University of Genova, Viale Benedetto XV, 1, 16132, Genova, Italy.
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MeSH Terms
Descriptor/Qualifier:
Cells, Cultured
Fibroblasts / metabolism*
Fucose / metabolism*
Golgi Apparatus / metabolism
Guanosine Diphosphate Fucose / metabolism*
Humans
Leukocyte-Adhesion Deficiency Syndrome / metabolism*,  pathology
Polysaccharides / metabolism*
Skin / pathology
Chemical
Reg. No./Substance:
0/Polysaccharides; 15839-70-0/Guanosine Diphosphate Fucose; 3713-31-3/Fucose

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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