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. 1997 Apr 15;25(8):1605–1610. doi: 10.1093/nar/25.8.1605

Detailed analysis of base preferences at the cleavage site of a trans-acting HDV ribozyme: a mutation that changes cleavage site specificity.

F Nishikawa 1, H Fauzi 1, S Nishikawa 1
PMCID: PMC146615  PMID: 9092669

Abstract

In our previous attempt at in vitro selection of a trans - acting human hepatitis delta virus (HDV) ribozyme, we found that one of the variants, G10-68-725G, cleaved a 13 nt substrate, HDVS1, at two sites [Nishikawa,F., Kawakami,J., Chiba,A., Shirai,M., Kumar,P.K.R. and Nishikawa,S. (1996) Eur. J. Biochem., 237, 712-718]. One site was the normal cleavage site and the other site was shifted 1 nt toward the 3'-end. To clarify the interactions between nucleotides around the cleavage site of the trans -acting HDV ribozyme, we analyzed the efficiency of the reaction for every possible base pair between the substrate and the ribozyme at positions -1 (-1N:726N) and +1 (+1N:725N) relative to the cleavage site using the genomic HDV ribozyme, TdS4(Xho), and derivatives of the most active variant, G10-68. These mutagenesis analyses revealed that the +1 base of the substrate affects the structure of the catalytic core in the complex with G10-68-725G, substrate and divalent metal ions, and it shifts the cleavage site. In a comparison with other variants of the trans -acting HDV ribozyme, we found that this cleavage site shift occurred only with G10-68-725G.

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Selected References

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