Document Detail

The role of the carbohydrate moiety in the biologic properties of fibrinogen.
MedLine Citation:
PMID:  6699016     Owner:  NLM     Status:  MEDLINE    
The carbohydrate moiety of some glycoproteins influences their secretion and functional properties. We have examined the importance of the oligosaccharide chains of fibrinogen in this regard. Fibrinogen was labeled de novo by the addition to rabbit hepatocyte monolayer cultures of either 3H-amino-acids or [2-3H] mannose, in the presence or absence of tunicamycin, a potent inhibitor of glycosylation. Inhibition of glycosylation, which ranged from 75 to 80%, was determined by incorporation of [2-3H]mannose as quantitated by gel filtration. Synthesis and secretion of fibrinogen were quantitated by 3H-amino-acid incorporation, using anti-fibrinogen immunoaffinity column chromatography of medium and cell homogenates. Tunicamycin did not appreciably inhibit fibrinogen synthesis, as compared to a 30-40% inhibition of overall protein synthesis, determined by incorporation of 3H-amino-acids into trichloroacetic acid-precipitable material. There was no evidence that secretion of fibrinogen was impaired. Fibrinogen from medium was copurified by adding cold plasma fibrinogen as carrier. Nonglycosylated fibrinogen was found to be functional as demonstrated by incorporation of radioactivity into clots of the copurified material at a rate identical to that of glycosylated fibrinogen. When clotted in the presence of Ca2+ and Factor XIII, cross-linking of glycosylated and nonglycosylated fibrin was demonstrable on fluorography of sodium dodecyl sulfate-polyacrylamide gels, showing disappearance of gamma-chain and appearance of gamma-gamma-dimers.
P B Gilman; P Keane; J Martinez
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Publication Detail:
Type:  In Vitro; Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The Journal of biological chemistry     Volume:  259     ISSN:  0021-9258     ISO Abbreviation:  J. Biol. Chem.     Publication Date:  1984 Mar 
Date Detail:
Created Date:  1984-04-24     Completed Date:  1984-04-24     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  2985121R     Medline TA:  J Biol Chem     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  3248-53     Citation Subset:  IM    
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MeSH Terms
Fibrinogen / genetics,  metabolism*
Glycoproteins / genetics,  metabolism*
Liver / drug effects,  metabolism
Mannose / metabolism
Tritium / diagnostic use
Tunicamycin / pharmacology
Grant Support
Reg. No./Substance:
0/Glycoproteins; 10028-17-8/Tritium; 11089-65-9/Tunicamycin; 31103-86-3/Mannose; 9001-32-5/Fibrinogen

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

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