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Nucleic Acids Research, 1977, Vol. 4, No. 10 3589-3597
© 1977

Articles

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

Nikos C. Vamvakopoulos, John N. Vournakis* and Stuart L. Marcus+

Department of Biology, Syracuse University Syracuse, NY 13210 +Memorial Sloan-Kettering Cancer Center 1275 York Avenue, New York, NY 10021, USA

*To whom to address correspondence

Received August 31, 1977. The secondary structure of the hydrogen bonded hybrids polycytidylate. oligodeoxguanylate (poiy(rC).(dG), 12–18) and poly (2'-oMe)cyt idylate-oligo-deoxyguanylate (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 suggests 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 polynucleotide complexes.


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