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Conjugate formation in urea: coupling of insoluble peptides to alkaline phosphatase for ELISA and in situ detection of antibody-forming cells

K Gerritse, M Fasbender, W Boersma and E Claassen

Department of Immunology, Medical Biological Laboratory TNO, Rijswijk, The Netherlands.

We report here a new method to produce synthetic peptide/alkaline phosphatase (AP) conjugates in the presence of urea. The method allows the use of peptides that are not soluble to a sufficient degree in aqueous buffers. The presence of 8 M urea during the construction of the synthetic peptide/AP conjugates does not influence enzyme activity nor the affinity of the anti-peptide antibodies for the conjugated peptide. We demonstrate that these synthetic peptide/AP conjugates can be used for detection of specific antipeptide antibody-forming cells (AFC) in vivo. This method for constructing enzyme conjugates with insoluble proteins or peptides suggest not only new possibilities for detection of specific AFC in vivo but also for applications in receptor- ligand studies, ELISA (enzyme-linked immunosorbent assay), and spot ELISA for detection of antibody-secreting cells in vitro.

Volume 39, Issue 7, pp. 987-992, 07/01/1991
Copyright © 1991 by The Histochemical Society


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