The Journal of Experimental Medicine, Vol 139, 773-778,
Copyright © 1974 by The Rockefeller University Press
NEW, THIRD CLASS OF AMYLOID FIBRIL PROTEIN
G. Husby 1,
J. B. Natvig 1, and
K. Sletten 1
1 From the Institute of Immunology and Rheumatology, Rikshospitalet University Hospital, Oslo, Norway, and the Institute of Biochemistry, University of Oslo, Oslo, Norway
An unusual protein AR was isolated from the amyloid fibril preparation derived from a patient with primary amyloidosis. Protein AR was unique in its antigenicity, and revealed no structural identity with any known amyloid proteins or with immunoglobulin chains or fragments. Thus a new third class of amyloid fibril proteins besides the immunoglobulin light-chain variable region fragments and the nonimmunoglobulin protein AS, has been characterized. A component antigenically related to protein AR was found in the serum of the patient.
Submitted on November 11, 1973