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Nucleic Acids Research, 1992, Vol. 20, No. 7 1517-1522
© 1992

MOLECULAR BIOLOGY

cDNA nucleotide sequence and expression of a tobacco cytoplasmic ribosomal protein L2 gene

Isabelle Marty and Yves Meyer

Laboratoire de Biologie Moléculaire et Physiologie Végétale, Unité associée au CNRS 565, avenue de Villeneuve 66860 Perpigian, France

Received January 24, 1992. Revised March 2, 1992. Accepted March 2, 1992.

The ribosomal protein L2 Is an essential component of the ribosomal large subunit by its relation to the peptidyl transferase reaction, subunit association and elongation factor G-GTP binding. We have isolated a 937 nucleotide long cDNA encoding a cytoplasmic ribosomal L2 protein, its deduced protein contains 260 amino acid residues and shows 65% identity with eucaryotic RL2 but only 32% identity with the chloroplast homologue. In addition, the protein presents the PROSITE signature which matches all the 50S and 60S L2 proteins and the two residues involved in the peptidyl transferase activity. The corresponding mRNA is accumulated in young plant tissues, in growing cell suspension and in germinating seeds but is not detectable in mature plant tissues, stationary cell suspension and in dry seeds. The mRNA accumulation is correlated with the growth process. Southern blot hybridization shows that cytoplasmic ribosomal protein L2 is encoded by two types of gene which could originate from each parent. Highly homologous L2 genes were also detected by Southern blots in the genomes of several monocot and dicot plant species.


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