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- W2076860651 abstract "Binding of the polyamines spermidine (∼-+3) and spermine (∼-+4) to yeast tRNAphe has been investigated by equilibrium dialysis under the same conditions used to study Mn2+-tRNAphe interactions (Schreier & Schimmel, 1974). The polyamines bind to tRNAphe in a co-operative and a non-co-operative phase, which is analogous to the behavior found with Mn2+. In the co-operative phase, the empirical index of co-operativity is somewhat greater for the polyamines, however. Binding constants for both the co-operative and non-co-operative phases are similar for Mn2+ and spermidine, and are strongest for spermine. Estimates of the total number of ligand binding sites indicate that these numbers are inversely proportional to the charge on the ligand for all three ligands. The interaction of polyamines with four large fragments of tRNAphe shows no evidence for co-operativity. These results, together with recent kinetic studies, collectively suggest that polyamine binding to the co-operative sites is associated with tertiary structure formation and that polyamine and divalent metal ion interactions with tRNA occur by phenomenologically similar mechanisms, in spite of their structural diversity." @default.
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- W2076860651 date "1975-04-01" @default.
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- W2076860651 title "Interaction of polyamines with fragments and whole molecules of yeast phenylalanine-specific transfer RNA" @default.
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- W2076860651 doi "https://doi.org/10.1016/0022-2836(75)90136-9" @default.
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