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- W2109845194 abstract "Abstract Two point mutants of Chlamydomonas reinhardtii, previously found by recombination and complementation analysis to map in the chloroplast atpB gene encoding the beta subunit of the CF1/CF0 ATP synthase, are here shown to be missense alterations near the 5' end of that gene. One mutant (ac-u-c-2-9) has a change at amino acid position 47 of the beta subunit from leucine (CTA) to arginine (CGA). In the second mutant (ac-u-c-2-29), the codon AAA (lysine) is changed to AAC (asparagine) at position 154. Spontaneous revertants of each mutant were isolated that restore the original wild type base pair. Northern analysis of total RNA and in vivo pulse labeling followed by immunoprecipitation reveals that both mutant atpB genes are transcribed and translated normally. However, immunoblots show that the amount of beta subunit associated with mutant thylakoids is only approximately 3% of that seen in wild type and that the CF1 alpha and gamma subunits are missing entirely. The disruption of ATP synthase complex assembly in these mutants is much more severe than in Escherichia coli beta subunit gene point mutants, which retain significant amounts of alpha and beta subunits on their membranes (Noumi, T., Oka, N., Kanazawa, H., and Futai, M. (1986) J. Biol. Chem. 261, 7070-7075). These results support the hypothesis that there are differences in assembly of the ATP synthase between E. coli and chloroplasts. In particular they indicate that beta must be present for assembly of the alpha and gamma subunits of CF1 onto chloroplast membranes." @default.
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- W2109845194 date "1989-02-01" @default.
- W2109845194 modified "2023-10-11" @default.
- W2109845194 title "Molecular characterization of two point mutants in the chloroplast atpB gene of the green alga Chlamydomonas reinhardtii defective in assembly of the ATP synthase complex" @default.
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- W2109845194 doi "https://doi.org/10.1016/s0021-9258(18)94180-3" @default.
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