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A protein factor contained in a 1 M KCl extract of L-cell ribosomes and partially purified by chromatography on DEAE-cellulose forms a specific ternary complex with rat-liver Met-tRNA(f) and GTP. The complex is measured by its quantitative retention on nitrocellulose membranes. Complex assembly is optimal at 100 mM KCl and 0.2 mM MgCl(2), and is independent of mRNA and of ribosomes. The GTP requirement can be replaced over 65% by its methylene analogue GDPCH(2)P, indicating that GTP hydrolysis is not involved. Complex formation is inhibited by 10 muM aurintricarboxylic acid, but is unaffected by 100 muM pactamycin, 100 muM fusidic acid, or by excess uncharged methionine tRNA(f). The ternary complex is relatively stable and appears at the void volume during filtration on Sephadex G-100. At 1-3 mM MgCl(2) and in the presence of other factors, the ternary complex is implicated in protein initiation by (i) its capacity to bind to the 40S ribosomal subunit to form a 48S complex; and (ii) the subsequent association of the 48S complex with a 60S subunit to form a functional "80S complex."

proceedings of the national academy of sciences of the united states of america

Protein Initiation in Eukaryotes: Formation and Function of a Ternary Complex Composed of a Partially Purified Ribosomal Factor, Methionyl Transfer RNA <sub>f</sub> , and Guanosine Triphosphate

Protein Initiation in Eukaryotes: Formation and Function of a Ternary Complex Composed of a Partially Purified Ribosomal Factor, Methionyl Transfer RNA f , and Guanosine Triphosphate

Protein Initiation in Eukaryotes: Formation and Function of a Ternary Complex Composed of a Partially Purified Ribosomal Factor, Methionyl Transfer RNA _f , and Guanosine Triphosphate