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. 1992 Apr 11;20(7):1593–1597. doi: 10.1093/nar/20.7.1593

The topography of the 3'-terminal region of Escherichia coli 16S ribosomal RNA; an intra-RNA cross-linking study.

T Döring 1, B Greuer 1, R Brimacombe 1
PMCID: PMC312243  PMID: 1374556

Abstract

30S ribosomal subunits, 70S ribosomes or polysomes from E. coli were subjected to mild ultraviolet irradiation, and the 3'-terminal region of the 16S RNA was excised by 'addressed cleavage' using ribonuclease H in the presence of suitable complementary oligodeoxynucleotides. RNA fragments from this region containing intra-RNA cross-links were separated by two-dimensional gel electrophoresis and the cross-link sites identified by our standard procedures. Five new cross-links were found in the 30S subunit, which were localized at positions 1393-1401 linked to 1531-1532, 1393-1401 linked to 1506, 1393-1401 to 1502-1504, 1402-1403 to 1498-1501, and 1432 to 1465-69, respectively. In 70S ribosomes or polysomes the first four of these were absent, but instead two cross-links between the 1400-region and tRNA were observed. These results are discussed in the context of the tertiary folding of the 3'-terminal region of the 16S RNA and its known functional significance as part of the ribosomal decoding centre.

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Selected References

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