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The middle and C-terminal domain (domain II/III) of elongation factor Tu from Thermus thermophilus lacking the GTP/GDP binding domain have been prepared by treating nucleotide-free protein with Staphylococcus aureus V8 protease. The isolated domain II/III of EF-Tu has a compact structure and high resistance against tryptic treatment and thermal denaturation. As demonstrated by circular dichroism spectroscopy, the isolated domain II/III does not contain any alpha-helical structure. Nucleotide exchange factor, EF-Ts, was found to interact with domain II/III, whereas the binding of aminoacyl-tRNA, GDP and GTP to this EF-Tu fragment could not be detected.

Interaction of the isolated domain II/III ofThermus thermophiluselongation factor Tu with the nucleotide exchange factor EF-Ts