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. 1989 Oct 11;17(19):7833–7842. doi: 10.1093/nar/17.19.7833

Deoxynucleotide-containing oligoribonucleotide duplexes: stability and susceptibility to RNase V1 and RNase H.

J R Wyatt 1, G T Walker 1
PMCID: PMC334890  PMID: 2552416

Abstract

Oligoribonucleotide duplexes containing one to four 2'-deoxynucleotide residues were used as substrates for ribonuclease V1 and RNase H. Either deoxyadenosine and/or deoxythymidine were incorporated into the duplex, 5'GGCCGGAUCCGCGC3'-5'GCGCGGAUCCGGCC3' by substitution of the appropriate deoxynucleoside triphosphate into a transcription reaction with T7 RNA polymerase. The melting temperature, Tm, of the duplex (1.8 microM in strands in 50 mM NaCl) containing only ribonucleotides was 79.9 degrees C. Substitution of deoxyadenosine in both strands of the duplex lowered the Tm by 2.4 degrees C. Substitution of deoxythymidine had no measurable effect on the Tm. Comparison of RNase V1 digestion patterns of fully ribonucleotide and deoxy-substituted duplexes suggest that any distortion is localized to the site of the substitution. An oligoribonucleotide containing two deoxy residues directs specific cleavage of RNA by E. coli RNase H. Structural requirements for cleavage are proposed for RNase V1 and RNase H.

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Selected References

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