Binding of guanosine 5'-triphosphate by soluble factors required for polypeptide synthesis.

Abstract
Two protein fractions separated by chromatography on DEAE-Sephadex are required for the binding of GTP as measured by retention on a Millipore filter. Both fractions are also needed for enzymatic binding of phenylalanyl-tRNA to ribosomes in the presence of GTP and poly U and for polymerization of phenylalanine in the presence of factor G. The results suggest that the transfer factors, Ts and Tu, are required for these reactions.

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