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Nucleic Acids Research, 1987, Vol. 15, No. 1 161-179
© 1987

Articles

Evolutionary changes in the higher order structure of the ribosomal 5S RNA

John McDougall and Ross N. Nazar

Department of Molecular Biology and Genetics, University of Guelph Guelph N1G 2W1, Canada

Received August 5, 1986. Revised December 1, 1986. Accepted December 1, 1986.

Comparative studies have been undertaken on the higher order structure of ribosomal 5S RNAs from diverse origins. Competitive reassociation studies show that 5S RNA from either a eukaryote or archaebacterium will form a stable ribonucleoprotein complex with the yeast ribosomal 5S RNA binding protein (YL3); in contrast, eubacterial RNAs will not compete in a similar fashion. Partial S1 ribonuclease digestion and ethylnitrosourea reactivity were used to probe the structural differences suggested by the reconstitution experiments. The results indicate a more compact higher order structure in eukaryotic 5S RNAs as compared to eubacteria and suggest that the archaebacterial 5S RNA contains features which are common to either group. The potential significance of these results with respect to a generalized model for the tertiary structure of the ribosomal 5S RNA and to the heterogeneity in the protein components of 5S RNA-protein complexes are discussed.


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