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Nucleic Acids Research, 1988, Vol. 16, No. 6 2369-2388
© 1988

Articles

Covalent cross-linking of poly(A) to Escherichia coli ribosomes, and localization of the cross-link site within the 16S RNA

Wolfgang Stiege, Katrin Stade, Dierk Schüler and Richard Brimacombe

Max-Planck-Institut für Molekulare Genetik Abteilung Wittmann, D-1000, Berlin-Dahlem, FRG

Received February 11, 1988. Accepted February 24, 1988.

Poly(A) can be cross-linked to E. coli 70S ribosomes in the presence of tRNALys by mild ultraviolet irradiation. The cross-linking reaction is exclusively with the 30S subunit, and involves primarily the RNA moiety. Foll owing a partial nuclease digestion, cross-linked complexes containing poly(A) and fragments of the 16S RNA were isolated by affinity chromatography on oligo(dT)-cellulose. The complexes were purified by gel electrophoresis and subjected to oligonucleotide analysis, which revealed a single cross-link site within positions 1394–1399 of the 16S RNA. The same pattern of cross-linking, at about one-fifth of the intensity, was observed in the absence of tRNALys. The cross-link site to poly(A), together with other sites in the 16S RNA that have been implicated in ribosomal function, is discussed in the framework of our recent model for the three-dimensional structure of 16S RNA; all of the functional sites are clustered together in two distinct groups in the model.


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