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Specific binding of a prokaryotic ribosomal protein to a eukaryotic ribosomal RNA: implications for evolution and autoregulation.
Gourse RL
,
Thurlow DL
,
Gerbi SA
,
Zimmermann RA
.
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Ribosomal protein L1 from the prokaryote Escherichia coli has been shown to form a specific complex with 26S ribosomal RNA from the eukaryote Dictyostelium discoideum. The segment of Dictyostelium rRNA protected from ribonuclease digestion by L1 and the corresponding region in Dictyostelium rDNA were investigated by nucleotide sequence analysis, and an analogous section in rDNA from Xenopus laevis was identified. When the L1-specific segments from eukaryotic rRNA were compared with those from prokaryotic rRNA, striking similarities in both primary and secondary structure were apparent. These conserved features suggest a common structural basis for protein recognition and indicate that such regions became fixed at a very early stage in rRNA evolution. In addition, certain structural elements of the L1 binding sites in rRNA are also found in the initial segment of the polycistronic L11-L1 mRNA, providing support for the hypothesis that L1 participates in the regulation of ribosomal protein synthesis by specific interaction with its own mRNA.
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