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Plant Physiology 82:1036-1039 (1986)
© 1986 American Society of Plant Biologists

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Articles

A New Lectin from Meadow Saffron (Colchicum automnale) 1

Willy J. Peumans2, Anthony K. Allen and Bruno P. A. Cammue3

Laboratorium voor Plantenbiochemie, KU Leuven, Kardinaal Mercierlaan, 92, B-3030 Leuven, Belgium, Department of Biochemistry, Charing Cross and Westminster Medical School, Fulham Palace Road, Hammersmith, London W6 8RF, United Kingdom

A lectin has been isolated from tubers of the meadow saffron (Colchicum autumnale). It is an octameric protein (Mr 100,000) composed of 4A- and 4B-subunits of Mr 15,000 and 10,000, respectively. It is a glycoprotein with 4.4% carbohydrate, the main sugars are (N-acetyl-) glucosamine, mannose, fucose, and xylose. Although the Colchicum autumnale agglutinin (CAA) agglutinates human red blood cells, it has a much higher activity with rabbit erythrocytes. With respect to its carbohydrate-binding specificity CAA behaves rather unusually as it is inhibited by lactose, galactose, N-acetylgalactosamine and related sugars when assayed with human red blood cells but not in assays with rabbit erythrocytes.

2 Supported in part by grants from the National Fund for Scientific Research (Belgium), of which W. J. P. is a Research Associate.

3 B. P. A. C. acknowledges the receipt of a Fellowship of the Belgian Instituut tot Aanmoediging van het Wetenschappelijk Onderzoek in Nijverheid en Landbouw.

1 Dedicated to Professor Albert Carlier.






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Copyright © 1986 by the American Society of Plant Biologists