The Journal of General Physiology
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The Journal of General Physiology, Vol 13, 669-681, Copyright © 1930 by The Rockefeller University Press

ARTICLE

ON THE MECHANISM OF OPSONIN AND BACTERIOTROPIN ACTION

IV. THE ISOELECTRIC POINTS OF CERTAIN SENSITIZED ANTIGENS



Morton McCutcheon 1, Stuart Mudd 1, Max Strumia 1, and Balduin Lucké 1

1 From The Henry Phipps Institute and the Department of Pathology of the University of Pennsylvania, Philadelphia

Sensitization with increasing concentrations of homologous immune serum shifts the isoelectric point of the antigens studied progressively to the alkaline side. Antigens maximally sensitized with rabbit sera have shown isoelectric points of pH 5.6 to 5.8. The globulins precipitated or salted out of the same immune sera have been isoelectric at pH 5.1 to 5.2.

The combination of antigen with antibody depends of course upon specific affinities; the surface properties of the sensitized antigen, agglutination and phagocytosis depend primarily upon the properties of the sensitizing serum substances combined with and deposited on the antigen surface.

 Accepted on April 5, 1930


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