Structure and Transcription of the 5S RRNA Gene from Spinach Chloroplasts

Overview

Journal Curr Genet

Specialty Genetics

Date 1987 Jan 1

PMID 2835181

Citations 17

Authors

H Audren

C Bisanz-Seyer

J F Briat

R Mache

Affiliations

Soon will be listed here.

Abstract

The nucleotide sequence of the spinach chloroplast 5S rRNA gene and its flanking regions has been determined. A prokaryotic type promoter is to be found upstream of the 5S rRNA gene. Northern blot experiments with selected gene probes show that the 5S gene is co-transcribed with the other ribosomal genes of the operon. This result is confirmed by 5' S1 mapping of in vivo RNAs synthesised in chloroplasts or in an E. coli strain harboring a multicopy plasmid containing the 5S rRNA gene and its flanking regions. In vitro transcription experiments show that initiation of transcription does not occur at the level of the putative 5S rRNA gene promoter. Therefore, we conclude that the 5S rRNA is synthesized only be co-transcription of its gene with the other ribosomal genes of the operon. 3' S1 nuclease mapping in the spacer region between the 4.5S and the 5S rRNA genes reveals a set of protected fragments located in an A.T rich region downstream of a very stable hairpin and immediately upstream of the putative 5S promoter. This result is interpreted by the presence of preterminated transcripts or processing sites in this region.

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