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

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Abstract
The major C. reinhardi y-1 chloroplast membrane polypeptides- I + II, IV, V(a + b)-were 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. Parts of the primary structure of these polypeptides are probably 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.