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Monoclonal antibodies directed to phytochrome from green leaves of Avena sativa L. cross-react weakly or not at all with the phytochrome that is most abundant in etiolated shoots of the same species

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Abstract

Seven monoclonal antibodies (MAbs) have been prepared to phytochrome from green oat (Avena sativa L. cv. Garry) leaves. One of these MAbs (GO-1) cross-reacts with apoprotein of the phytochrome that is most abundant in etiolated oat shoots as assessed by immunoblot assay of fusion proteins expressed in Escherichia coli. The epitope for this MAb is located between amino acids 618 and 686 in the primary sequence of type 3 phytochrome (Hershey et al. 1985, Nucleic Acids Res. 13, 8543–8559), which is one of the predominant phytochromes in etiolated oats. Three other MAbs (GO-4, GO-5, GO-6) immunoprecipitate phytochrome isolated from green oat leaves, as evaluated by photoreversibility assay. GO-1, GO-4, GO-5 and GO-6 are therefore directed to phytochrome. While evidence obtained with the other three MAbs (GO-2, GO-7, GO-8) strongly indicates that they are also directed to phytochrome, this evidence is not as rigorous. Recognition of antigen by any of these seven MAbs is not significantly reduced by periodate oxidation, indicating that their epitopes probably do not include carbohydrate. All but GO-1 bind either very poorly or not at all the phytochrome that is abundant in etiolated oat shoots. These data reinforce earlier observations made with antibodies directed to phytochrome from etiolated oats, indicating (1) that the phytochromes that predominate in etiolated and green oats differ immunochemically and (2) that phytochrome preparations from green oat leaves contain very little of the phytochrome that is abundant in etiolated shoots. An hypothesis that these two immunochemically distinct phytochromes form heterodimers in vitro

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Abbreviations

Da:

Dalton

DEAE:

diethylaminoethyl

ELISA:

enzyme-linked immunosorbent assay

HA:

hydroxyapatite

Ig:

immunoglobulin

MAb:

monoclonal antibody

SDS:

sodium dodecyl sulfate is supported by comparison of immunoblot data obtained with conventionally purified phytochrome from etiolated oats to that expressed as fusion protein in E. coli.

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Author notes

  1. Yukio Shimazaki

    Present address: Mitsui Toatsu Chemicals, Inc., Life Science Laboratory, Togo, Mobara-shi, 297, Chiba-ken, Japan

  2. Marie-Michèle Cordonnier

    Present address: Department of Botany, University of Georgia, GA 30602, Athens, USA

Authors and Affiliations

  1. Department of Botany, University of Georgia, 30602, Athens, GA

    Lee H. Pratt, Yukio Shimazaki & Yu-Chie Wang

  2. Ciba-Geigy Biotechnology, Cornwallis Road, 3054, 27709, Research Triangle Park, NC, USA

    Sandy J. Stewart & Marie-Michèle Cordonnier

Authors
  1. Lee H. Pratt
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  2. Sandy J. Stewart
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  3. Yukio Shimazaki
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  4. Yu-Chie Wang
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  5. Marie-Michèle Cordonnier
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Additional information

This research was supported by the U.S. Department of Energy (contract DE-AC-09-81SR10925 to L.H.P.). We thank Dr. Lyle Crossland and Ms. Sue Kadwell for their assistance in the construction of the cDNA clones, and Dr. Gyorgy Bisztray for providing us with clone pCBP3712. Dr. Phillip Evans and Dr. Russell Malmberg kindly provided MAbs 4F3, 6F12 and 8C10, as well as a corresponding antigen preparation. The excellent technical assistance of Mrs. Donna Tucker and Mrs. Danielle Neal is gratefully acknowledged.

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Pratt, L.H., Stewart, S.J., Shimazaki, Y. et al. Monoclonal antibodies directed to phytochrome from green leaves of Avena sativa L. cross-react weakly or not at all with the phytochrome that is most abundant in etiolated shoots of the same species. Planta 184, 87–95 (1991). https://doi.org/10.1007/BF00208241

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  • DOI: https://doi.org/10.1007/BF00208241

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