Monoclonal antibody specific for yeast elongation factor 3

Area of Science:

• Molecular Biology
• Biochemistry
• Yeast Genetics

Background:

• Protein synthesis involves complex elongation factors.
• Yeast elongation factor 3 (EF-3) is essential for translation but its precise role remains incompletely understood.
• Monoclonal antibodies offer specific tools for studying protein function.

Purpose of the Study:

• To generate and characterize a monoclonal antibody against yeast EF-3.
• To elucidate the role of EF-3 in yeast protein synthesis using this antibody.

Main Methods:

• Hybridoma technology was used to produce monoclonal antibodies against yeast translation components.
• Purification of monoclonal antibodies via DEAE-Affi-Gel Blue chromatography.
• Assay of antibody function in a cell-free yeast protein synthesis system.
• Immunoaffinity chromatography for EF-3 purification and characterization.

Main Results:

• A specific monoclonal antibody (PSH-1) was generated, targeting yeast EF-3.
• The PSH-1 antibody inhibited translation of natural mRNA and poly(U), and polysomal chain elongation.
• Antibody binding studies confirmed interaction with EF-3, not EF-1 or EF-2.
• Purified EF-3 was shown to be essential for mRNA translation and associated with polysomes.

Conclusions:

• Yeast EF-3 is indispensable for both natural mRNA and poly(U) translation.
• EF-3 plays a critical role in the elongation phase of protein synthesis.
• Monoclonal antibody PSH-1 is a valuable tool for studying EF-3 function in yeast ribosomes.