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. 1984 Jun;158(3):934–942. doi: 10.1128/jb.158.3.934-942.1984

Structure of an Escherichia coli tRNA operon containing linked genes for arginine, histidine, leucine, and proline tRNAs.

L M Hsu, H J Klee, J Zagorski, M J Fournier
PMCID: PMC215531  PMID: 6327651

Abstract

A plasmid containing a gene for the most abundant Escherichia coli leucine isoacceptor tRNA, tRNALeu1 (anticodon CAG) was isolated from the Clarke-Carbon bank of cloned E. coli DNA. The clone contains a 12.3-kilobase DNA insert which was mapped by F' DNA hybridization analysis to the region 82 to 89 min on the chromosome. The cloned tDNALeu corresponds to the minor of two chromosomal regions containing different amounts of DNA complementary to tRNALeuCAG . Sequencing of the tDNA region revealed it to contain a multimeric transcription unit consisting of four different tRNA genes. The genes are in the arrangement 5'-leader- tRNAArgCCG -57 base pairs- tRNAHisGUG -20 base pairs- tRNALeuCAG -42 base pairs- tRNAProUGG -3'. Coordinate expression of the component tRNAs in vivo and the absence of intercistronic promoters indicated that all four tDNAs reside in the same operon. The tDNA sequence is bounded by a promoter element showing good agreement with the procaryotic consensus sequence and a GC-rich stem-loop element that corresponds to a rho-independent terminator. The promoter region contains a GC-rich sequence that agrees with a suggested consensus stringency control element and two domains possessing dyad symmetry which flank the Pribnow box and include the putative stringency control region.

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Selected References

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