Summary
The allelic nuclear mutations of Chlamydomonas reinhardtii, cr-6 and cr-7, result in the loss of two proteins from the large subunit of the chloroplast ribosome. One of these proteins, L-13, is synthesized in the chloroplast and the other, L29, is made in the cytoplasm. The loss of these two proteins is correlated with the inability of the large subunits of the chloroplast ribosomes to form monomers which incorporate labeled phenylalanine at normal rates in response to a polyuridylic acid template. Using antisera raised against L13 and L29, we found that protein L-13 was synthesized in appreciable amounts in pulse labeled cells of cr-6 and cr-7, but protein L-29 was not. We conclude that the inability to synthesize protein L29 is a primary defect in both cr-6 and cr-7 and that this protein is required for the stable assembly of protein L-13 into chloroplast ribosomes. The absence of one or both of these proteins from the large subunit of chloroplast ribosomes of the mutants interferes with the ability of the small and large subunits to associate properly into normal 70S monomers.
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Myers, A.M., Harris, E.H., Gillham, N.W. et al. Mutations in a nuclear gene of Chlamydomonas cause the loss of two chloroplast ribosomal proteins, one synthesized in the chloroplast and the other in the cytoplasm. Curr Genet 8, 369–378 (1984). https://doi.org/10.1007/BF00419826
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DOI: https://doi.org/10.1007/BF00419826