Abstract

The binding of [3H]dihydrostreptomycin to the 70-S ribosome or to the 30-S subunit has been investigated in the presence of neomycin by the Millipore filtration or the equilibrium dialysis procedure. It was observed that dihydrostreptomycin binds equally well to the 30-S subunit and the 70-S ribosome, and that neomycin stimulates the binding of dihydrostreptomycin to the ribosome by increasing the association constant and not by creating new binding sites. Specific removal of protein S1 from the 30-S subunit neither affected the binding of dihydrostreptomycin to the ribosome nor the stimulation of dihydrostreptomycin binding by neomycin.

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