Nov 1, 1975

Photoaffinity labeling of concanavalin A. Preparation of a concanavalin A derivative with reduced valence

Journal of Biochemistry
M BeppuT Osawa

Abstract

Concanavalin A (Con A) was labeled with p-azidophenyl alpha-D-mannopyranoside under ultraviolet irradiation and the reaction products were separated by affinity chromatography on Sephadex G-100 at pH 5. One of the Con A derivatives thus obtained was characterized as a monovalent dimer at pH 5 and a divalent tetramer at pH 7 by sedimentation equilibrium and equilibrium dialysis, indicating that this photoaffinity labeling did not alter the quaternary structure of Con A. In agreement with these results, the labeled Con A did not show the capacity to precipitate glycogen at pH 5, but it formed precipitates with glycogen at pH 7. Although its hemagglutinating activity was found to be weaker than that of the native Con A, the dose-response cure of the labeled Con A in the mitogenic stimulation of human peripheral lymphocytes was almost identical to that of the native con A.

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Mentioned in this Paper

Precipitin Tests
Derivatives
Thymidine
Lymphocytes as Percentage of Blood Leukocytes (Lab Test)
Mannosides
Lymphoid Cells
Mannose
Dimer
Sedimentation Procedure
Glycogen

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