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The polypeptides of the barley light-harvesting protein of photosystem I (LHCI) share certain epitopes. At least two of these common epitopes are present in chlorophyll a/b-protein 1 (Chla/b-P1 = CP29), as shown by cross-reacting monoclonal antibodies (14). These antibodies were employed for immunological identification of polypeptides translated in vitro in an mRNA-dependent cell-free rabbit reticulocyte lysate. The monoclonal antibody CMpLHCI:2 precipitated only one polypeptide of molecular weight 28 kD from in vitro translates primed with polyA+ RNA. No 28 kD precipitation band was found, if this antibody was mixed with a PSI-200 preparation before it was added to the translate. The translational capacity of the LHCI transcripts isolated from 12 hours greened barley was much higher than those isolated from 6 hours greened barley. Transcripts for LHCI polypeptides were also found among the polyA+ RNA of the mutant viridis-k23, which is devoid of LHCI polypeptides in its thylakoid membranes. The monoclonal antibody CMpCh1a/b-P1:1 precipitated a polypeptide of molecular weight 31 kD from in vitro translates primed with polyA+ RNA. Thus, the cross-reactivity the two antibodies show with the mature proteins is not found when the antibodies are reacted with the precursor proteins.

Probing in vitro translation products with monoclonal antibodies to chlorophylla/b-binding proteins of barley thylakoids