Thromb Haemost 1985; 54(04): 788-791
DOI: 10.1055/s-0038-1660134
Original Article
Schattauer GmbH Stuttgart

On the Composition and Function of the Carbohydrate Moiety of Tissue-Type Plasminogen Activator from Human Melanoma Cells

D C Rijken
*   The Gaubius Institute, Health Research Division TNO, Leiden, The Netherlands,
,
J J Emeis
*   The Gaubius Institute, Health Research Division TNO, Leiden, The Netherlands,
,
G J Gerwig
**   The Department of Bio-Organic Chemistry, State University of Utrecht, Utrecht, The Netherlands
› Author Affiliations
Further Information

Publication History

Received 20 May 1985

Accepted 05 September 1985

Publication Date:
19 July 2018 (online)

Summary

Two variants (I and II) of tissue-type plasminogen activator (t-PA) from human melanoma cells were separated by Lysine Sepharose chromatography. The carbohydrate compositions of the forms were determined by gas-liquid chromatography. Variant I contained 12.8 g and variant II 7.1 g of carbohydrate per 100 g protein. Both variants contained N-acetylgalactosamine, suggesting O-glycosylation in addition to N-glycosylation. The possible role of N-linked oligosaccharides for the biological activity of t-PA was studied using t-PA secreted by melanoma cells in the presence of tunicamycin, an inhibitor of N-glycosylation. The latter t-PA showed the same plasminogen activating and fibrin binding properties as normally glycosylated t-PA, indicating that N-linked carbohydrate is not involved in the fibrinolytic activity of t-PA.

 
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