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Nucleic Acids Research, 1988, Vol. 16, No. 15 7457-7475
© 1988

Articles

The 9S RNA precursor of Escherichia coli 5S RNA has three structural domains: implications for processing

Jan Christiansen+

Biostructural Chemistry, Kemisk Institut, Aarhus Universitet DK-8000 Aarhus C, Denmark

+Present address: Department of Clinical Chemistry, Bispebjerg Hospital, DK-2400 Copenhagen NV, Denmark

Received April 26, 1988. Accepted July 4, 1988.

The secondary structure of the 9S RNA precursor to ribosomal 5S RNA in Escherichia coli has been determined using chemical reagents and ribonucleases in combination with a reverse transcription procedure. The 9S RNA precursor was generated in vitro by T7 RNA polymerase, and the rrnB operon terminator, T1, was able to terminate the in vitro transcript. The secondary structure model exhibits three structural domains corresponding to a 5' region, a mature region and a terminator region. The mature domain is structurally identical to 5S RNA, and the ribosomal proteins L18 and L25 are able to bind to the precursor. The processing endoribonuclease RNase E cleaves between the structural domains. Moreover, an intramolecular refolding of the nascent transcript must take place if the current view of RNase III processing stems is correct.


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