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Complexes of poly(adenylic acid) with complementary monomers.
European Journal of Biochemistry
|January 2, 1976
Summary
Poly(A) interactions with various monomers were studied, revealing specific complex formations with xanthine and oxoformycin. These findings enhance understanding of polynucleotide-monomer interactions and their structural properties.
Area of Science:
- Biochemistry
- Molecular Biology
- Polymer Science
Background:
- Poly(A) (polyadenylic acid) exists as a random coil at pH 7.0 and a protonated double helix at pH 6.0.
- Understanding monomer interactions with poly(A) is crucial for polynucleotide complex studies.
Purpose of the Study:
- To investigate the interaction of potentially complementary monomers with poly(A).
- To characterize the stoichiometry, structure, and stability of poly(A)-monomer complexes.
Main Methods:
- Equilibrium dialysis
- Optical rotatory dispersion (ORD)
- Ultraviolet (UV) absorption spectroscopy
- Thermal stability measurements
Main Results:
- Poly(A) formed 1:1 complexes with xanthine at pH 6 and 2:1 at pH 7.
- Oxoformycin formed a 1:1 complex with poly(A) at both pH values.
- Complex formation was pH-dependent, with some monomers showing no interaction.
Conclusions:
- The study characterized various poly(A)-monomer complexes, detailing their stoichiometry and structural properties.
- Reinvestigation clarified the helix-coil transitions and melting behavior of poly(A)-3-methylxanthine complexes.
- Structural differences were observed between poly(A) complexes with 3-methylxanthine and 7-methylxanthine.