Abstract
Reverse transcriptase from avian myeloblastosis virus can react with periodate-treated primer tRNATrp (beef) to form a Schiff's base between an epsilon-NH2 lysine group within the active center of the enzyme and the dialdehyde derivative of the 3' terminal ribose of tRNA. In the presence of cyanoborohydride the reversible imminium moiety of the Schiff's base is reduced to a more stable adduct. Non-primer tRNAs were not able to reduce the extent of primer fixation to the enzyme. Complete inactivation of the enzyme was attained when the ratio enzyme:tRNA in the complex was 1:1. When the 1:1 adduct was analyzed by polyacrylamide gel electrophoresis, radioactivity from the terminal adenosine of tRNA was found exclusively associated with the alpha subunit. At longer times of labeling the beta subunit was also found linked to the oxidized primer tRNA.
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Selected References
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