Converting GTP hydrolysis into motion: versatile translational elongation factor G

Area of Science:

• Molecular Biology
• Biochemistry
• Genetics

Background:

• Elongation factor G (EF-G) is a crucial translational GTPase involved in protein synthesis.
• EF-G plays roles in translation elongation, ribosome recycling, and maintaining mRNA reading frame.
• It also facilitates ribosome sliding over non-coding mRNA regions.

Purpose of the Study:

• To review recent advances in understanding the mechanism of EF-G action.
• To elucidate EF-G's role as a force-generating GTPase.
• To highlight the ligand-dependent nature of EF-G's functions.

Main Methods:

• This review synthesizes findings from various biochemical and structural studies.
• It focuses on the unconventional GTPase cycle of EF-G.
• Analysis of EF-G's interaction with different ligands in the ribosomal A site.

Main Results:

• EF-G utilizes an unconventional GTPase cycle that couples GTP hydrolysis to mechanical movement.
• The GDP-Pi form of EF-G facilitates movement.
• Ligands such as tRNA, mRNA elements, or ribosome recycling factor dictate the direction and timing of EF-G-mediated motion.

Conclusions:

• EF-G is a versatile GTPase essential for multiple steps in protein synthesis.
• Its force-generating capability is modulated by specific ligands.
• Understanding EF-G's mechanism provides insights into fundamental cellular processes.