Versatile cloning system for construction of multimeric proteins for use in atomic force microscopy.

Area of Science:

• Biophysics
• Protein Engineering
• Molecular Biology

Background:

• Atomic force microscopy (AFM) requires well-defined protein substrates.
• Constructing multimeric proteins with specific properties presents challenges.
• Previous methods lacked versatility in protein assembly and analysis.

Purpose of the Study:

• To develop a versatile system for constructing multimeric proteins for AFM.
• To enable structural and biophysical analysis of proteins within multimeric constructs.
• To facilitate the study of proteins with challenging expression profiles.

Main Methods:

• A modular cassette system for protein construction.
• In situ sequencing of constructed modules.
• Assembly of three-module fragments for analysis.
• Utilizing parent titin modules as linkers and internal standards.
• Expression and force measurements of engineered proteins.

Main Results:

• Demonstrated a versatile system for creating multimeric protein substrates.
• Enabled structural and biophysical characterization of proteins in multimeric assemblies.
• Showcased the utility of titin modules for linking and force calibration.
• Successfully expressed and measured forces of previously insoluble proteins.

Conclusions:

• The developed system provides a flexible platform for multimeric protein construction.
• This approach enhances the study of protein structure-function relationships using AFM.
• The system overcomes limitations in protein expression for biophysical analysis.