title: Observations on template-specific conditions for DNA synthesis by avian myeloblastosis virus DNA polymerase.
abstract: The effects of Mg++, Mn++, and KCl addition, individually and in combination, on the rate of DNA- and RNA-primed DNA synthesis by avian myeloblastosis virus DNA polymerase (reverse transcriptase) using a variety of natural and synthetic template-primer combinations were examined. Optimal divalent cation concentrations were found to vary by as much as 10-fold depending upon the template-primer used to direct synthesis. Addition of KCl to reaction mixtures containing optimal divalent cation concentrations produced stimulation or inhibition of DNA synthesis which was also template-specific. DNA synthesis on the modified template poly (2'-0-methylcytidylate) was uniquely stimulated by combinations of divalent cations. With Mg++ as divalent cation, deviations from classical Michaelis-Menten kinetics of substrate saturation were observed with all template-primers tested.
mesh_terms: D001354:Avian Leukosis Virus / Q000201:enzymology*; D009189:Avian Myeloblastosis Virus / Q000201:enzymology*; D004279:DNA, Viral / Q000096:biosynthesis*; D007700:Kinetics; D008274:Magnesium / Q000494:pharmacology; D008345:Manganese / Q000494:pharmacology; D011119:Polynucleotides / Q000378:metabolism; D011189:Potassium Chloride / Q000494:pharmacology; D012194:RNA-Directed DNA Polymerase / Q000378:metabolism*; D013698:Templates, Genetic
chemical_list: D004279:DNA, Viral; D011119:Polynucleotides; D008345:Manganese; D011189:Potassium Chloride; D012194:RNA-Directed DNA Polymerase; D008274:Magnesium