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- W4930512 abstract "A polynucleotide helical structure containing two strands of poly(A) and one of poly(U) has been discovered. The stoichiometry of the complex was determined by continuous variation titrations and isosbestic wavelength analysis. Thermal denaturation profiles were used to examine complex stability over a wide range of conditions. The complex forms only when the poly(A) strands are of molecular weight between 9000-50,000 Daltons (dp approx. 28-150), whereas the size of the poly(U) strand has no effect. This limitation may explain why poly(AAU) was not observed in previous investigations. The complex shows inverse dependence of stability on ionic strength, but is not favored by decreasing pH. This behavior, together with the intermediate poly(A) size requirement suggest that the conformational entropy of the poly(A) strands is a critical determinant of the stability of this complex. The potential of the poly(A) tails of mRNA for formation of this triple helix, and of AAU/T triplet formation to contribute to the binding of unique sequence RNA strands to gene-encoding nucleic acid double helices are noted." @default.
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- W4930512 date "1987-05-01" @default.
- W4930512 modified "2023-09-26" @default.
- W4930512 title "New nucleic acid triple helix, Poly(AAU)" @default.
- W4930512 hasPublicationYear "1987" @default.
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