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Nucleic Acids Research, 1980, Vol. 8, No. 17 3809-3828
© 1980

MOLECULAR BIOLOGY

Sequence of the distal tRNA1Asp gene and the transcription termination signal in the Escherichia coli ribosomal RNA operon rrnF(or G)

Takao Sekiya, Midori Mori, Nozomi Takahashi and Susumu Nishimura

Biology Division, National Cancer Center Research Institute Tsukiji 5-1-1, Chuo-ku, Tokyo, Japan

Received May 21, 1980. Several DNA fragments carrying tRNA genes have been cloned from EcoRI endonuclease digests of Escherichia coli DNA. Using cloned DNA, the sequence of the region around the distal gene for Formula (F(or G)) in the E. coli ribosomal RNA operon [rrnF(or G)] has been determined. In the distal portion of rrnF(or G), the genes for 23S, 5S rRNA and Formula (F(or G)) are located in that order and separated by intergenic spacers of 93 and 52 base pairs, respectively. A possible hairpin structure, with its center between the 22nd and 23rd base pair downstream from the 3'-end of the Formula (F(or G)) gene, followed by a sequence of eight thymidine residues was identified as the transcription termination signal for rrnF(or G). The termination is rho-independent, at least in vitro, and occurs within the region of the contiguous thymidine residues. A possible promoter for a protein gene is present about 50 base pairs downstream from the rrnF(or G) terminator.


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