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. 1996 Aug 1;24(15):3010–3016. doi: 10.1093/nar/24.15.3010

Selection of the best target site for ribozyme-mediated cleavage within a fusion gene for adenovirus E1A-associated 300 kDa protein (p300) and luciferase.

H Kawasaki 1, J Ohkawa 1, N Tanishige 1, K Yoshinari 1, T Murata 1, K K Yokoyama 1, K Taira 1
PMCID: PMC146048  PMID: 8760887

Abstract

The cellular 300 kDa protein known as p300 is a target for the adenoviral E1A oncoprotein and it is thought to participate in prevention of the G0/G1 transition during the cell cycle, in activation of certain enhancers and in the stimulation of differentiation pathways. In order to determine the exact function of p300, as a first step we constructed a simple assay system for the selection of a potential target site of a hammerhead ribozyme in vivo. For the detection of ribozyme-mediated cleavage, we used a fusion gene (p300-luc) that consisted of the sequence encoding the N-terminal region of p300 and the gene for luciferase, as the reporter gene. We were also interested in the correlation of the GUX rule, for the triplet adjacent to the cleavage site, with ribozyme activity in vivo. Therefore, we selected five target sites that all included GUX The rank order of activities in vitro indeed followed the GUX rule; with respect to the kcat, a C residue as the third base (X) was the best, next came an A residue and a U residue was the worst (GUC > GUA > GUU). However, in vivo the tRNA(Val) promoter-driven ribozyme, targeted to a GUA located upstream of the initiation codon, had the highest inhibitory effect (96%) in HeLa S3 cells when the molar ratio of the DNA template for the target p300 RNA to that for the ribozyme was 1:4. Since the rank order of activities in vivo did not conform to the GUX rule, it is unlikely that the rate limiting step for cleavage of the p300-luc mRNA was the chemical step. This kind of ribozyme expression system should be extremely useful for elucidation of the function of p300 in vivo.

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