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. 1986 Oct 24;14(20):8135–8153. doi: 10.1093/nar/14.20.8135

Synthesis and properties of oligonucleotides containing 2'-deoxynebularine and 2'-deoxyxanthosine.

R Eritja, D M Horowitz, P A Walker, J P Ziehler-Martin, M S Boosalis, M F Goodman, K Itakura, B E Kaplan
PMCID: PMC311840  PMID: 3095793

Abstract

The preparation of synthetic oligonucleotides containing 2'-deoxynebularine (dN) and 2'-deoxyxanthosine (dX) is described. The thermal stabilities of duplexes containing dX, dN, and 2'-deoxyinosine (dI) base-paired with the four natural bases have been measured. Xanthine base pairs have stabilities at pH 5.5 that are similar to those of dI-containing duplexes at neutral pH. When xanthine is paired with adenine or cytosine an unusual stabilization of the duplex structure is observed at acid pH. Incorporation of base mispairs opposite template xanthine sites were measured using Drosophila DNA polymerase alpha. The relative nucleoside incorporation rates are in the order: T greater than C much greater than A approximately equal to G. These rates do not correlate with relative thermodynamic stabilities of base mispairs with xanthine obtained from Tm measurements: T greater than G greater than A approximately equal to C. We suggest that DNA polymerase misinsertion rates are greatest when the base mispair can be formed in accordance with Watson-Crick as opposed to other base pairing geometries even though other geometries, e.g. wobble, may result in a more stable final DNA product.

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Selected References

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