ESCORTing proteins directly from whole cell-lysate for single-molecule studies

Area of Science:

• Biochemistry
• Surface Chemistry
• Biophysics

Background:

• Single-molecule studies require high-purity proteins, often necessitating complex and time-consuming purification protocols.
• Immobilizing proteins onto surfaces while maintaining their functional integrity is crucial for various biophysical techniques.

Purpose of the Study:

• To develop a streamlined method for orienting and tethering recombinant proteins onto surfaces directly from cell lysates.
• To eliminate the need for extensive protein purification in single-molecule studies.

Main Methods:

• Enzymatic Sortase-assisted Covalent Orientation-specific Restraint Tethering (ESCORT) was employed for protein immobilization.
• An improved surface passivation technique was utilized to enhance surface properties.
• Single-molecule fluorescence and force-mapping techniques were used to validate the method.

Main Results:

• ESCORT demonstrated high specificity in protein tethering.
• The modified surfaces exhibited high passivity, minimizing non-specific interactions.
• Anchored proteins retained their functional integrity, as confirmed by biophysical measurements.

Conclusions:

• ESCORT offers a simplified and efficient approach for preparing samples for single-molecule studies.
• This method significantly reduces the time, cost, and effort required for protein immobilization and purification.
• ESCORT is anticipated to accelerate advancements in single-molecule biophysics and related fields.