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Cross-reactivity of monoclonal antibodies against phytochrome from Zea and Avena

Localization of epitopes, and an epitope common to monocotyledons, dicotyledons, ferns, mosses, and a liverwort

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Abstract

The cross-reactivity of diverse monoclonal antibodies against phytochrome from Zea and Avena was tested by enzyme-linked immunosorbentassay (ELISA) and by immunoblotting. About 40 antibodies were selected by means of nondenatured phytochrome; all of them reacted with sodium dodecyl sulfate denatured homologous antigen on immunoblots. The epitopes for 14 antibodies (4 raised against Avena and 10 against Zea phytochrome) were localized in 6 regions of the phytochrome molecule by means of Western blot analysis of proteolytic fragments of known localization. Results of studies on the inhibition of antibody binding by other antibodies were largely compatible with these latter findings. Except in a few cases, inhibition occurred when antibodies were located on the same or a closely adjacent region. As demonstrated by 16 species, cross-reactivity with phytochromes from other Poaceae was high. Greater losses in cross-reactivity were observed only with antibodies recognizing an epitope in the vicinity of the carboxyl terminus of 118-kg · mol-1 phytochrome. Cross-reactivity with phytochrome from dicotyledons was restricted to a few antibodies. However, phytochrome(s) from plants illuminated for 24 h or more could be detected. One of the antibodies that recognized phytochrome from dicotyledons was also found to recognize phytochrome or a protein of 120–125 kg·mol-1 from several ferns, a liverwort and mosses. This antibody (Z-3B1), which was localized within a 23.5-kg·mol-1 section of Avena phytochrome (Grimm et al., 1986, Z. Naturforsch. 41c, 993), seems to be the first antibody raised against phytochrome from a monocotyledon with such a wide range of reactivity. Even though epitopes were recognized on different phytochromes, the strength of antibody binding indicated that these epitopes are not necessarily wholly identical.

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Abbreviations

ELISA:

enzyme-linked immunosorbent assay

McAb:

monoclonal antibody

PBS:

phosphate-buffered saline

Pfr (Pr):

far-red-absorbing (red-absorbing) form of phytochrome

SDS-PAGE:

sodium dodecyl sulfate-polyacrylamide gel electrophoresis

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Authors and Affiliations

  1. Botanisches Institut der Universität zu Köln, Gyrhofstrasse 15, D-5000, Köln 41, Federal Republic of Germany

    Hansjörg A. W. Schneider-Poetsch & Heribert Schwarz

  2. Botanisches Institut der Universität München, Menzinger Strasse 67, D-8000, München 19, Federal Republic of Germany

    Rudolf Grimm & Wolfhart Rüdiger

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  1. Hansjörg A. W. Schneider-Poetsch
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  2. Heribert Schwarz
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  3. Rudolf Grimm
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  4. Wolfhart Rüdiger
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Schneider-Poetsch, H.A.W., Schwarz, H., Grimm, R. et al. Cross-reactivity of monoclonal antibodies against phytochrome from Zea and Avena . Planta 173, 61–72 (1988). https://doi.org/10.1007/BF00394489

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  • DOI: https://doi.org/10.1007/BF00394489

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