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Novel data on interactions of elongation factor Ts
M G Bubunenko1, M L Kireeva, A T Gudkov
1Institute of Protein Research, Russian Academy of Sciences, Pushchino, Moscow Region.
Biochimie
|May 1, 1992
Summary
Elongation factor Ts (EF-Ts) remains bound to elongation factor Tu (EF-Tu) and aminoacyl-tRNA throughout protein synthesis, up to GTP hydrolysis on the ribosome.
Area of Science:
- Molecular Biology
- Protein Synthesis
- Biochemistry
Background:
- Elongation factor Tu (EF-Tu) is crucial for delivering aminoacyl-tRNA to the ribosome during protein synthesis.
- Elongation factor Ts (EF-Ts) acts as a guanine nucleotide exchange factor for EF-Tu.
- The precise timing and nature of EF-Ts and EF-Tu interactions during the elongation cycle require further elucidation.
Purpose of the Study:
- To investigate the dynamic interactions between EF-Ts and EF-Tu during all stages of the ribosomal elongation cycle.
- To determine when EF-Ts dissociates from the EF-Tu.aminoacyl-tRNA complex.
- To explore the functional implications of these interactions for protein synthesis.
Main Methods:
- Limited trypsinolysis to probe protein structure and interactions.
- Gel-filtration chromatography for size-based separation and complex analysis.
- Analytical centrifugation to assess complex stability and stoichiometry.
- Fluorescence polarization to monitor binding dynamics.
Main Results:
- EF-Ts does not dissociate from EF-Tu immediately after the GDP to GTP exchange.
- The EF-Ts.EF-Tu complex remains associated with aminoacyl-tRNA.
- This ternary complex persists until the GTP hydrolysis step on the ribosome.
Conclusions:
- EF-Ts plays a role beyond simple nucleotide exchange, maintaining a stable interaction with EF-Tu.aminoacyl-tRNA.
- The sustained interaction suggests a role in facilitating GTP hydrolysis or subsequent steps.
- These findings refine our understanding of the intricate molecular mechanisms governing protein synthesis elongation.