Abstract
The effect of d(CA/TG)n DNA segments on tRNA transcription has been examined. Alternating purine-pyrimidine tracts were cloned at a long distance from, adjacent to, or within the coding sequence of a tRNAPro gene from Caenorhabditis elegans and shown to be able to assume the A-DNA conformation in vitro in physiological salt concentrations. The transcriptional level of these constructs was compared to that of normal tDNAPro by micro-injection into Xenopus laevis oocytes. Our results show a strong inhibitory effect by potential Z-DNA sequences only when these are placed in the flanking regions of the gene or when they are located between the elements (Box A and Box B) of the split promoter. Transcription was studied in parallel with supercoiled and linear DNA molecules carrying a d(CA/TG) stretch 124-bp long in front of the tRNAPro gene. The results show the same level of inhibition of Po/III transcription regardless of the topological status of the injected DNA.
Lingua originale | Inglese |
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pagine (da-a) | 1553-1559 |
Numero di pagine | 7 |
Rivista | EMBO Journal |
Volume | 3 |
Numero di pubblicazione | 7 |
DOI | |
Stato di pubblicazione | Pubblicato - lug 1984 |