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Nucleic Acids Research, 1977, Vol. 4, No. 12 4323-4346
© 1977

Articles

Studies on the primary structure of the ribosomal 23S RNA of Escherichia coli: II. A characterisation and an alignment of 24 sections spanning the entire molecule and its application to the localisation of specific fragments

Christiane Branlant, Johanes Sri Widada, Alain Krol and Jean-Pierre Ebel

Institute de Biologie Moléculaire et Cellulaire du C.N.R.S., Université Louis Pasteur 67084 Strasbourg Cédex, France

Received October 3, 1977. We have employed new methodology to obtain 23S RNA fragments which includes a) the digestion of the RNA within 50S subunits and b) the limited hydrolysis of the 13S and 18S fragments. By comparing all 23S RNA fragments, obtained heretofore, we have characterised and aligned 24 sections of this RNA spanning nearly the entire molecule. These results allow the localisation of any new 23S RNA fragment by comparison of the fingerprint of its T1 ribonuclease digest to the characteristic ones of the different sections. In this way we obtained a more definite localisation of the binding sites of the 50S proteins L1, L5, L9, L18, L20 L23 and L25. We also specified a ribonuclease sensitive region of 23S RNA in native 50S subunits, extending from the 1100th nucleotide from the 5' end to the 1000th nucleotide from the 3' end; this region contains a cluster of 5 modified nucleotides and may be at the subunit interface.


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