Metal Ion Chelates as Surrogates of Nucleobases for the Recognition of Nucleic Acid Sequences: The Pd(2+) Complex of 2,6-Bis(3,5-dimethylpyrazol-1-yl)purine Riboside.

ABSTRACT: A 2,6-bis(3,5-dimethylpyrazol-1-yl)purine ribonucleoside has been prepared and incorporated as a conventionally protected phosphoramidite into a 9-mer 2'-O-methyl oligoribonucleotide. According to 1H NMR spectroscopic studies, this nucleoside forms with Pd(2+) and uridine a ternary complex that is stable at a micromolar concentration range. CD spectroscopic studies on oligonucleotide hybridization, in turn, suggest that the Pd(2+) chelate of this artificial nucleoside, when incorporated in a 2'-O-methyl-RNA oligomer, is able to recognize thymine within an otherwise complementary DNA strand. The duplex containing thymidine opposite to the artificial nucleoside turned out to be somewhat more resistant to heating than its counterpart containing 2'-deoxycytidine in place of thymidine, but only

SUBMITTER: Taherpour S 

PROVIDER: S-EPMC3359700 | biostudies-literature | 2012

REPOSITORIES: biostudies-literature