T7 RNA polymerase transcription of Escherichia coli isoacceptors tRNA(Leu)

Y Li; J Chen; E Wang; Y Wang

doi:10.1007/BF02880055

T7 RNA polymerase transcription of Escherichia coli isoacceptors tRNA(Leu)

Sci China C Life Sci. 1999 Apr;42(2):185-90. doi: 10.1007/BF02880055.

Authors

Y Li¹, J Chen, E Wang, Y Wang

Affiliation

¹ Shanghai Institute of Biochemistry, Chinese Academy of Sciences, China.

PMID: 18726472
DOI: 10.1007/BF02880055

Abstract

The T7 promoter and the gene encoding tRNA(Leu) were synthesized chemically and cloned into plasmid pUC19, where the gene was transcribed in vitro with T7 RNA polymerase purified. It was found that spermidine had a negative effect on T7 transcription. The amount of transcribed tRNA was about 250 times that of the template DNA under optimal reaction conditions. The unmodified tRNA(1) (Leu) and tRNA(2) (Leu) had similar leucine accepting ability, which however was only one fourth that of the native modified ones. This result indicated that the modified nucleotides of tRNA(Leu) played some though not key roles in its aminoacylation.