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Nucleic Acids Research, 1988, Vol. 16, No. 1 61-76
© 1988

Articles

Promoters of Mycoplasma capricolum ribosomal RNA operons: identical activities but different regulation in homologous and heterologous cells

Ron Gafny, Hana C. Hyman1, Shmuel Razin1 and Gad Glaser

Department of Cellular Biochemistry, Hebrew University-Hadassah Medical School Jerusalem 91010, Israel Department of Membrane and Ultrastructure Research, Hebrew University-Hadassah Medical School Jerusalem 91010, Israel

Received October 13, 1987. Revised December 9, 1987. Accepted December 9, 1987.

The 5' region of the rRNA operon, rrnA, of M. capricolum was cloned. Sequence analysis revealed two tRNA genes, tRNAleu and tRNAlys, upstream to the promoter of the rRNA operon. The in vivo transcription start sites of the rRNA operon and of the tRNA genes were mapped. The same promoters used by M. capricolum RNA polymerase are also recognized by E. coli RNA polymerase both in vivo and in vitro. We find that high levels of ppGpp in E. coll, resulting from amino acid starvation or from spoT mutation, activate rather than repress the transcription of the mycoplasma rrnA operon.


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