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  • Title: A point mutation in the gene encoding the Rubisco large subunit interferes with holoenzyme assembly.
    Author: Shikanai T, Foyer CH, Dulieu H, Parry MA, Yokota A.
    Journal: Plant Mol Biol; 1996 May; 31(2):399-403. PubMed ID: 8756604.
    Abstract:
    Ribulose 1,5-bisphosphate carboxylase/oxygenase (Rubisco), a key enzyme of photosynthetic CO2 fixation, is composed of 8 large and 8 small subunits. The Rubisco-deficient Nicotiana tabacum mutant Sp25 is able to synthesize the peptides for both subunits but does not contain any active holoenzyme. The phenotype is maternally inherited and thus caused by a mutation in the chloroplast genome, which also encodes the Rubisco large subunit. A comparison of the nucleotide sequences of the large subunit gene of the Sp25 mutant with that of the wild-type tobacco revealed a single nucleotide change in the Sp25 mutant. This resulted in an amino acid substitution at Gly-322, which was replaced by serine.
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