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Nucleic Acids Research, 1980, Vol. 8, No. 17 3793-3808
© 1980

MOLECULAR BIOLOGY

The distal end of the ribosomal RNA operon rrnD of Eschenchia coli contains a tRNA1thr gene, two 5S rRNA genes and a transcription terminator

Gregg L. Duester and Walter M. Holmes

Medical College of Virginia, Virginia Commonwealth University Box 678-MCV Station, Richmond, VA 23298, USA

Received June 13, 1980. The distal region of the Escherichia coli ribosomal RNA operon rrnD has been sequenced to identify transfer RNA genes which might be within this transcriptional unit, and to define a possible transcription termination site. A nucleotide sequence corresponding to the gene for Formula is located between two genes for 5S rRNA. The spacer region between the proximal 5S rRNA gene and the Formula gene is 12 base pairs long, whereas the spacer region between the distal 5S rRNA gene and the Formula gene is 37 base pairs. Possible sites for RNA processing are discussed, and the sequence of the Formula gene is found to possess the same anticodon as the Formula gene. A putative transcription termination site for rrnD was located about 25 base pairs distal to the 3' end of the second 5S rRNA gene. The rrnD and rrnC terminators are compared with each other and with other prokaryotic terminators. Located at exactly the same site on the complementary strand is another putative transcription termination site for a gene being transcribed towards rrnD. The possibility of overlapping terminators is discussed.


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