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Plant Physiology 59:167-172 (1977)
© 1977 American Society of Plant Biologists

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Preparation of Antibodies against Specific Chloroplast Membrane Polypeptides Associated with the Formation of Photosystems I and II in Chlamydomonas reinhardi y-1 1

Rodolphe Schantz2, Shoshana Bar-Nun and Itzhak Ohad

a Department of Biological Chemistry, The Hebrew University of Jerusalem, Jerusalem, Israel

The major Chlamydomonas reinhardi y-1 chloroplast membrane polypeptides-I + II, IV, V(a + b)-have been isolated by use of preparative sodium dodecyl sulfate-gel electrophoresis.

Rabbit antisera prepared against these polypeptides interact with intact membranes as well as membrane fractions containing these specific antigens. Antisera against polypeptides I + II partially inactivate photosystem I. Antisera against polypeptide IV prevent inactivation of the Hill reaction and inhibit photooxidation of diphenylcarbazide with dichlorophenolindophenol as an electron acceptor. The protection of the Hill reaction by IV antiserum, measured with whole membranes, is partially hindered by the presence of V antiserum, which, by itself, causes inhibition of diphenylcarbazide photooxidation.

We concluded that parts of the primary structure of these polypeptides are exposed in situ and can be recognized in whole membranes by antisera prepared against sodium dodecyl sulfate-denatured antigens. Polypeptides I and II, and polypeptides IV, Va, and Vb are associated with photosystem I and photosystem II, respectively.

2 Dr. Schantz was on a leave of absence from, and supported by le Centre National de la Recherche Scientifique, France. Present address: Department of Botany, University of Strasbourg, Strasbourg, France.

1 Research supported by Grant Agreement 184 from the United States-Israel Binational Science Foundation and Grant No. Dr. 29/17 from the Deutsche Forschungsgemeinschaft.






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Copyright © 1977 by the American Society of Plant Biologists