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Monoclonal antibodies to antigens in the peribacteroid membrane from Rhizobium ‐induced root nodules of pea cross‐react with plasma membranes and Golgi bodies
Author(s) -
Brewin N.J.,
Robertson J.G.,
Wood E.A.,
Wells B.,
Larkins A.P.,
Galfre G.,
Butcher G.W.
Publication year - 1985
Publication title -
the embo journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 7.484
H-Index - 392
eISSN - 1460-2075
pISSN - 0261-4189
DOI - 10.1002/j.1460-2075.1985.tb03673.x
Subject(s) - library science , monoclonal antibody , biology , antibody , immunology , computer science
Three rat hybridoma lines that produced monoclonal antibodies reacting with the peribacteroid membrane from Pisum sativum were isolated, and these all appeared to recognise the same antigenic structure. Using one of these monoclonal antibodies, AFRC MAC 64, electron microscopy of immunogold‐stained thin sections of nodule tissue revealed that the antigen, present in the peribacteroid membrane, was also found in the plant plasma membranes and in the Golgi bodies, but not in the endoplasmic reticulum. When peribacteroid membrane proteins were separated by SDS‐polyacrylamide gel electrophoresis and transferred to nitrocellulose by electro‐blotting, it was found that MAC 64 bound to a series of protease‐sensitive bands that migrated in the mol. wt. range 50‐85 K. The epitope was sensitive to periodate oxidation and its structure may therefore involve the carbohydrate component of a membrane glycoprotein. We suggest that this structure originates in the Golgi apparatus and is subsequently transferred to the peribacteriod membranes and plasma membranes. The monoclonal antibody also reacted with peribacteroid membranes from nodules of Vicia and lupin, and with plasma membranes and Golgi membranes from uninfected plant cells, including root tip cells from onion ( Allium cepa ), indicating that the antigen is highly conserved in the plasma membranes of plant cells.