Stringent analysis of gene function and protein-protein interactions using fluorescently tagged genes

Area of Science:

• Molecular Biology
• Genetics
• Biochemistry

Background:

• Green fluorescent protein (GFP) trap lines in Drosophila are valuable for studying gene expression and protein localization.
• Existing GFP trap collections have limitations for comprehensive loss-of-function analyses.

Purpose of the Study:

• To extend the utility of GFP trap lines for loss-of-function studies in Drosophila.
• To develop methods for high-throughput screening using fluorescently tagged proteins in cell lines.
• To enable the study of endogenous protein complexes in Drosophila.

Main Methods:

• Utilized nonoverlapping, highly specific short hairpin RNA (shRNA) transgenes targeting GFP.
• Generated GFP traps in Drosophila cell lines using a MiMIC transposon.
• Employed recombinant nanobodies and mass spectrometry for protein complex analysis.

Main Results:

• Successfully adapted GFP trap collections for loss-of-function studies.
• Established GFP traps in cell lines enabling distinct subcellular localization patterns for high-throughput screening.
• Demonstrated the ability to study endogenous protein complexes using fluorescent traps, nanobodies, and mass spectrometry.

Conclusions:

• The described method significantly enhances the application of GFP trap lines in Drosophila research.
• This approach provides powerful tools for genetic screens and proteomic analyses.
• The findings facilitate a deeper understanding of gene function and protein interactions in vivo.