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Nucleic Acids Research, 1977, Vol. 4, No. 3 663-671
© 1977

Articles

Wheat embryo mitochondrial 18S ribosomal RNA: evidence for its prokaryotic nature

L. Bonen, R.S. Cunningham, M.W. Gray and W.F. Doolittle

Department of Biochemistry, Dalhousie University Halifax, NS B3H 4H7, Canada

Received January 10, 1977. We present a catalog of sequences of oligonucleotides produced by Tl ribonuclease digestion of 32P-labeled small-ribosomal-subunit RNA ("18S" rRNA) isolated from purified wheat embryo mitochondria. This catalog is compared to catalogs published for prokaryotic and chloroplaat 16S rRNAs and to preliminary results for wheat cytosol 18S rRNA. These comparisons indicate that: (1) wheat mitochondrial 18S rRNA is clearly prokaryotic in nature, showing significantly more sequence homology with 16S rRNAs than can be expected to arise by chance (p<0.000001); (2) shared oligonucleotide sequences include an especially high proportion of those identified as conserved in the evolution of prokaryotic rRNAs; and (3) wheat embryo mitochondrial and cytosol 18S rRNAa retain no more, and perhaps less, than the minimum sequence homology detectable by this sensitive method. These results argue in favor of an endosynbiotic origin for mitochondria.


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