Protocol to detect and quantify interactions between proteins expressed in Drosophila S2 cells

Area of Science:

• Molecular Biology
• Biochemistry
• Cell Biology

Background:

• Quantifying protein interactions is crucial for understanding cellular mechanisms.
• Traditional methods for protein interaction analysis can be time-consuming and labor-intensive.
• Difficult-to-express proteins present unique challenges in interaction studies.

Purpose of the Study:

• To present a novel, rapid, and efficient protocol for quantifying protein interactions.
• To introduce the select western blot-free tagged-protein interaction (SWFTI) assay.
• To enable the study of difficult-to-express proteins in Drosophila cells.

Main Methods:

• The SWFTI assay utilizes SNAP and CLIP tags for protein labeling.
• The protocol involves plasmid design, cell culture, protein expression, and immunoprecipitation.
• Protein quantification is achieved through a fluorescence-based technique without western blotting.

Main Results:

• The SWFTI assay provides a fluorescence-based method for protein quantification.
• This protocol allows for the rapid assessment of protein interactions.
• The assay is effective for difficult-to-express proteins in Drosophila.

Conclusions:

• The SWFTI assay offers a streamlined approach to studying protein interactions.
• This western blot-free technique simplifies the quantification of ectopically expressed proteins.
• The protocol facilitates the investigation of protein interactions in Drosophila cell systems.