Using Bimolecular Fluorescence Complementation (BiFC) with Photoactivated Localization Microscopy (PALM) to Analyze...

Area of Science:

• Molecular Biology
• Cell Biology
• Developmental Biology

Background:

• Bimolecular Fluorescence Complementation (BiFC) visualizes protein-protein interactions (PPIs) in living systems.
• Conventional BiFC microscopy is limited by light diffraction to ~250 nm resolution.
• Photoactivated Localization Microscopy (PALM) offers nanometer resolution and single-molecule sensitivity.

Purpose of the Study:

• To adapt and present a protocol for BiFC-PALM in Drosophila larval salivary glands.
• To enable nanometer-scale visualization of PPIs in a complex in vivo environment.
• To study the interaction between Hox proteins Ultrabithorax (Ubx) and Extradenticle (Exd) in Drosophila.

Main Methods:

• Utilized PAmCherry1 fluorescent protein for BiFC and PALM compatibility.
• Developed a BiFC-PALM protocol specifically for Drosophila larval salivary glands.
• Applied the method to visualize the Ubx-Exd protein complex interaction.

Main Results:

• Successfully implemented BiFC-PALM in Drosophila larval salivary glands.
• Achieved nanometer spatial resolution for PPI visualization in vivo.
• Demonstrated the feasibility of studying Hox protein interactions using this advanced technique.

Conclusions:

• BiFC-PALM is a viable and powerful method for high-resolution PPI analysis in Drosophila.
• This protocol expands the application of super-resolution microscopy to studying developmental processes in vivo.
• The study provides a foundation for future investigations of protein interactions in complex model organisms.