Purification and crystallization of the ternary complex of elongation factor Tu:GTP and Phe-tRNA(Phe)

Area of Science:

• Molecular Biology
• Structural Biology
• Biochemistry

Background:

• Elongation factor Tu (EF-Tu) is the most abundant protein in prokaryotes, crucial for protein biosynthesis.
• EF-Tu is a G-protein that binds guanosine phosphates (GDP or GTP) and facilitates the binding of aminoacylated tRNA (aa-tRNA) to the ribosome.
• The EF-Tu:GTP:aa-tRNA ternary complex interacts with the ribosome, leading to GTP hydrolysis and release of inactive EF-Tu:GDP.

Purpose of the Study:

• To report the successful crystallization of a specific ternary complex involving Thermus aquaticus EF-Tu.
• To facilitate further structural and functional analysis of EF-Tu in complex with aa-tRNA.

Main Methods:

• Purification of the ternary complex using High-Performance Liquid Chromatography (HPLC).
• Crystallization of the purified Thermus aquaticus EF-Tu:GDPNP and yeast Phe-tRNA(Phe) ternary complex.

Main Results:

• Successful crystallization of the EF-Tu:GDPNP:Phe-tRNA(Phe) ternary complex was achieved.
• The purified complex was suitable for structural determination.

Conclusions:

• The crystallization of this ternary complex provides a foundation for detailed structural studies.
• Understanding the structure of EF-Tu complexes is vital for comprehending the mechanism of protein biosynthesis.