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. 1980 Jul 25;8(14):3175–3191. doi: 10.1093/nar/8.14.3175

Enzymatic synthesis of polyuridylic acid containing modified bases.

Y K Ho, J Aradi, T J Bardos
PMCID: PMC324363  PMID: 7443515

Abstract

5'Mercaptouridine-5'-diphosphate (hs5UDP) has been synthesized and investigated as a substrate of the polynucleotide phosphorylase of Micrococcus luteus. While hs5UDP is not utilized alone, it can be copolymerized with UDP; however, unusually for this enzyme, the ratio of 5'mercaptouridylate vs. uridylate residues in the polynucleotide product (MPU) is always lower than the ratio of hs5UDP v. UDP in the substrate mixture. Furthermore, hs5UDP decreases the rate of the enzymic polymerization reaction. The MPU product forms two-stranded and three-stranded complexes with poly(A). The circular dichroic spectra of these complexes are similar to those formed between poly(U) and poly(A), but their melting profiles indicate somewhat lower stability. The physicochemical and biochemical properties of the enzymic product are qualitatively similar to those of MPU prepared by chemical modification; both are potent inhibitors of a DNA-dependent RNA polymerase.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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