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Tetrahymena thermophila 80S ribosomes have been cross-linked to non-enzymatically bound AcVal-tRNA, presumably at the ribosomal P-site. Like the ribosomes from Escherichia coli, yeast, and Artemia salina, cross-linking is exclusively to C-1609, the equivalent of the E. coli C-1400 residue. Mutation of the RNA from G-1707 to A or from U-1711 to C which results in resistance to paromomycin or hygromycin, respectively, failed to affect the rate, yield, or site of cross-linking. The presence of the antibiotics during cross-linking also was without effect. It is concluded that at these two positions the base changes made do not interfere with the tertiary structure of the decoding site.
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