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J. Biol. Chem., Vol. 263, Issue 13, 6188-6192, 05, 1988

Ribosomal protein L2 in Saccharomyces cerevisiae is homologous to ribosomal protein L1 in Xenopus laevis. Isolation and characterization of the genes

C Presutti, A Lucioli and I Bozzoni
Dipartimento di Genetica e Biologia Molecolare, Universita La Sapienza, Roma, Italy.

By cross-hybridization with a cDNA probe for the Xenopus laevis ribosomal protein L1 we have been able to isolate the homologous genes from a Saccharomyces cerevisiae genomic library. We have shown that these genes code for a ribosomal protein which was previously named L2. In yeast, like in X. laevis, these genes are present in two copies per haploid genome and, unlike the vertebrate counterpart, they do not contain introns. Amino acid comparison of the X. laevis L1 and S. cerevisiae L2 proteins has shown the presence of a highly conserved protein domain embedded in very divergent sequences. Although these sequences are very poorly homologous, they confer an overall secondary structure and folding highly conserved in the two species.
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