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The nucleotide sequences of the genes for cytochrome b and three potential transfer RNAs (tRNAPro, tRNAThr and tRNAGlu) in cloned rat mitochondrial DNA were determined. The derived amino acid sequence of the cytochrome b protein from the light strand indicated that the C-terminal amino acid is asparagine and the ochre termination codon is encoded in the DNA, in contrast to the the lack of termination codon in the reading frame of human [Anderson et al., Nature 290 (1981) 457] or mouse [Bibb et al., Cell 26 (1981) 167] mitochondrial DNA. The first ATG codon of the cytochrome b gene was spaced five nucleotides from the 5'-end of the tRNAGlu gene on the heavy strand. There was a single nucleotide spacing between the termination codon of the cytochrome b gene and the 5' end of the tRNAThr gene in the light strand. There was also a single nucleotide spacing between the 3'-end of the tRNAThr gene and the 3'-end of the tRNAPro gene on the heavy strand. The amino acid and nucleotide sequences of the cytochrome b genes of mammals and yeast [Nobrega and Tzagoloff, J. Biol. Chem. 255 (1980) 9828] were compared to reveal structural differences in two very different species. At the same time, amino acid substitutions in particular regions of the mammalian gene corresponding to the exon-intron boundaries in the yeast gene were noted. These genetic features are discussed in relation to the extreme compression of genetic information in the mammalian mitochondrial genome as related to the evolution of the gene organization and its sequence.
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