A simple real-time assay for in vitro translation.

Area of Science:

• Biochemistry
• Molecular Biology
• Synthetic Biology

Background:

• Accurate measurement of protein synthesis rates is crucial for understanding cellular processes and drug development.
• Existing methods for measuring translation rates can be time-consuming or lack real-time quantitative capabilities.

Purpose of the Study:

• To develop a high-throughput assay for real-time measurement of translation rates in cell-free protein synthesis.
• To demonstrate the assay's utility in characterizing ribosome activity and antibiotic effects.

Main Methods:

• The SNAP assay utilizes the synthesis of O(6)-alkylguanine DNA O(6)-alkyltransferase (SNAP) for continuous fluorescence detection.
• SNAP production is monitored using quenched fluorogenic substrates that release fluorescence upon reaction with SNAP.
• The assay was validated using Escherichia coli ribosomes in the PURExpress system and for determining macrolide antibiotic IC50 values.

Main Results:

• The SNAP assay provides quantitative, real-time data on overall translation rates in vitro.
• The assay successfully measured the activity of wild-type and fluorescently labeled mutant E. coli ribosomes.
• The 50% inhibitory concentrations (IC50) of three macrolide antibiotics were determined.

Conclusions:

• The SNAP assay is a versatile and efficient tool for studying cell-free protein synthesis.
• This assay facilitates the characterization of ribosome function and the screening of translation inhibitors.
• The development of the SNAP assay advances high-throughput methodologies in molecular biology research.