Abstract

The combination of cDNA and RNA sequencing techniques has enabled determination of the complete sequence of one of the mRNAs coding for the precursor of the small subunit of ribulose bisphosphate carboxylase of Nicotiana sylvestris. In this 898-nucleotide-long mRNA, 540 nucleotides code for the entire 180-amino-acid-long precursor polypeptide consisting of the 57-amino acid-long transit peptide and the 123-amino-acid-long mature protein, while 60 and 195 nucleotides belong to the 5′ and 3′ noncoding flanking regions, respectively. The 5′ end, which is very rich in AG residues, contains several direct and indirect repeated sequences, and a possible hairpin structure. The 3′ end, terminated by a 103-nucleotide-long poly-A tail, is very rich in AU residues but does not contain the classical polyadenylation signal sequence.

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