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Nucleic Acids Research, 1980, Vol. 8, No. 21 4927-4941
© 1980

MOLECULAR BIOLOGY

The 3'-terminal sequence of the small subunit ribosomal RNA from hamster mitochondria

Richard Baer and Donald T. Dubin

Department of Microbiology, College of Medicine and Dentistry of New Jersey, Rutgers Medical School Piscataway, NJ 08854, USA

Received August 11, 1980. The 220 3'-terminal nucleotides of the small ribosomal subunit RNA (13S) of hamster (BHK-21) cell mitochondria have been sequenced and the positions of post-transcriptionally methylated residues within this seouence have been established. Also, we have derived the secondary structure of the 3'-terminus of mitochondrial 13S rRNA by 1) searching nucleotide sequences of 13S rRNA, procaryotic 16S rRNA and eucaryotic 18S rRNA for common secondary structures and 2) using single-strand specific endonucleases to map secondary interactions in 13S rRNA.

The pyrimidine tract CCUCC in E. coli 16S rRNA, which participates in base-pairing with bacterial mRNA, is absent in mitochondrial 13S rRNA. We believe that the binding of mRNA to mammalian mitochondrial ribosomes is not mediated by a conventional Shine-Dalgarno interaction.


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