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Increased functional activity of elongation factor G with G16V mutation in the GTP-binding domain.

Oligonucleotide-directed mutagenesis was used to obtain elongation factor G from Thermus thermophilus with the G16V mutation in its GTP-binding domain. Functional studies of the mutated protein and elongation factor G from E. coli were carried out. The data revealed that the G16V mutant retains high thermostability, has an increased ribosome-dependent GTPase activity, and its translation activity in cell-free translation system is equal to that of the factor G from E. coli. The mutated protein with an uncleavable GTP analog also has an increased affinity to the ribosomes.