Abstract
Methanol causes association of 30S and 50S ribosomal subunits from E. coli at MgCl 2 concentrations in which they are normally completely dissociated. The 70S ribosome formed under these conditions shows a lower sedimentation velocity and is functionally active in the EF-G GTPase. Association of ribosomal subunits in the presence as well as absence of methanol is affected by washing the ribosomes with 0.5 M NH 4Cl. Methanol reduces the Mg 2+ concentration required for subunit association as well as for EF-G GTPase activity. The basic requirement for EF-G GTPase activity both with and without alcohol is shown to be the association of 30S and 50S subunits.
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