Summary
In S. typhimurium, the hisR locus is defined by mutations causing reduced levels of the histidine tranfer RNA. As a preliminary step in the analysis of the hisR mutants, a 972 bp DNA fragment containing the histidine tRNA gene from wild-type Salmonella was cloned and completely sequenced. This analysis revealed the existence of a tRNA gene cluster which, in addition to the tRNAHis gene, includes the genes for tRNA Leu1 , tRNA Pro1 and a tentative tRNA ArgCGG . All four tRNA genes are present as single copies and are separated by spacer sequences ranging from 20 to 53 bp in length. The gene cluster is efficiently transcribed in vitro by E. coli RNA polymerase and yields a transcript, approximately 480 nucleotides long, which contains all four tRNA sequences. This tetrameric precursor can be processed to 4S RNA in vitro with a wild-type Salmonella extract, but not with an extract prepared from a hisU (RNase P) mutant. Using portions of the tRNA gene cluster as specific hybridization probes, various processing intermediates were shown to accumulate in vivo in the hisU mutant. Most of these RNAs are monomeric precursors only a few nucleotides longer than the respective mature tRNA species.
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Communicated by G.R. Smith
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Bossi, L. The hisR locus of Salmonella: Nucleotide sequence and expression. Molec Gen Genet 192, 163–170 (1983). https://doi.org/10.1007/BF00327662
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DOI: https://doi.org/10.1007/BF00327662