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Nucleic Acids Research, 1986, Vol. 14, No. 19 7541-7556
© 1986

Articles

A subpopulation of spinach chloroplast tRNA genes does not require upstream promoter elements for transcription

W. Gruissem*, C. Elsner-Menzel, S. Latshaw, J. O. Narita, M. A. Schaffer and G. Zurawski1

Department of Botany, University of California Berkeley, CA 94720 1DNAX Research Institute of Molecular and Cellular Biology 901 California Avenue, Palo Alto, CA 94304, USA

*To whom correspondence should be addressed

Received August 8, 1986. Accepted September 5, 1986.

We have identified a class of spinach plastid tRNA genes which do not require 5' upstream promoter elements for their expression in a chloroplast transcription system. The 5' DNA sequences flanking the trnRl and trnSl coding regions have little or no homology to previously characterized chloroplast promoter sequences. The deletion of the 5' DNA sequences from these genes to positions close to the start of the coding regions has little effect on their transcription in vitro. In addition, a synthetic DNA fragment homologous to the 5' region of trnSl does not support the transcription of the promoter (–)trnM2 mutant 51 in a promoter/trnM2-51 fusion assay. In a dicistronic construct the wild type trnSl gene does not support transcription of the trnM2-51 promoter mutant, indicating that termination of trnS1 transcription occurs immediately following the 3' end of the coding region. Both trnS1 and trnR1 compete with trnM2 for the same chloroplast RNA polymerase and/or common transcription factors.


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