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An improved method for the purification of bacterial polypeptide elongation factor Ts (EF-Ts) from one mesophile (Escherichia coli) and two thermophiles (Bacillus stearothermophilus and PS3) is described. The improvements are both in the facility of isolation and in increased yields. The purified factors were used for cross-reactivity studies with elongation factor Tu (EF-Tu) obtained from the same bacterial strains. In all combinations studied, the efficiency of EF-Ts in catalyzing the exchange of EF-Tu-bound GDP was proportional to the strength of the protein-protein complex. Whereas the factors from the two thermophiles were interchangeable, the mesophilic EF-Ts formed a very weak complex with thermophilic EF-Tu; however, thermophilic EF-Ts formed very strong complexes with mesophilic EF-Tu. Thus, e.g., EF-Tu from E. coli formed a complex with EF-Ts from B. stearothermophilus which was 10 times more stable than the corresponding homologous complex.

Bacterial elongation factor Ts: isolation and reactivity with elongation factor Tu