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Nucleic Acids Research, 1981, Vol. 9, No. 17 4285-4302
© 1981

MOLECULAR BIOLOGY

The use of 2-iminothiolane as an RNA-protein cross-linking agent in Escherichia coli ribosomes, and the localisation on 23S RNA of sites cross-linked to proteins L4, L6, L21, L23, L27 and L29

Iwona Wower, Jacek Wower, Marlis Meinke and Richard Brimacombe

Max-Planck-Institut für Molekulare Genetik, Abteilung Wittmann Ihnestrasse 63-73, Berlin-Dahlem, GFR

Received July 9, 1981. When E. coli ribosomal subunits are reacted with 2-iminothiolane and then subjected to a mild ultraviolet irradiation, an RNA-protein cross-linking reaction occurs. About 5% of the total protein in each subunit becomes cross-linked to the RNA, and a specific sub-set of proteins is involved in the reaction. In the case of the 50S subunit, the sites of cross-linking to the 23S RNA have been determined for six of these proteins: protein L4 is cross-linked within an oligonucleotide comprising positions 613–617 in the 23S sequence, L6 within positions 2473–2481, L21 within positions 540–548, L23 within positions 137–141, L27 within positions 2332–2337 and L29 within positions 99–107.


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