Oct 1, 1977

The effect of magnesium and manganese ions on the structure and template activity for reverse transcriptase of polyribocytidylate and its 2'-0-methyl derivative

Nucleic Acids Research
N C VamvakopoulosS L Marcus


The secondary structure of the hydrogen bonded hybrids polycytidylate-oligodeoxguanylate (poly(rC)-(dG)12-18 and poly (2'-oMe) cytidylate-oligodeoxyguanylate (poly (rCm)-(dG)12-18 was studied at several magnesium and manganese ion concentrations. These hybrids are effective template-primer complexes for the synthesis of poly(dG) by avian myeloblastosis virus (AMV) DNA polymerase under disparate ionic conditions. Circular dichroism spectra and thermal melting data were obtained as a function of ion concentration, including conditions that allow optimum rates of poly (dG) synthesis by each complex. These studies demonstrate that both hybrids can change conformation and stability depending on their ionic environment. Comparison of enzyme activity and physical data suggest that the polymerase recognizes particular secondary structure features. Changes in the activity of the AMV polymerase can be induced by varying the Mg++ and Mn++ concentrations alone and in combination. These variations in enzyme activity are correlated with observed changes in the base-stacking alignment of the synthetic template primers. The ions, therefore, seem to affect enzyme activity by altering the conformation of the polnucleotide complexes.

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Mentioned in this Paper

RNA Conformation
Avian myeloblastosis virus
Genetic Template
Hydrogen Bonding
Poly C
Genomic Hybridization
Circular Dichroism, Vibrational
RNA-Directed DNA Polymerase

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