LILAC: enhanced actin imaging with an optogenetic Lifeact

Area of Science:

• Cell biology
• Biochemistry
• Biophysics

Background:

• Lifeact is a widely used tool for visualizing actin filaments in live cells.
• Overexpression of Lifeact can lead to cellular perturbations and sickness, potentially affecting experimental results.
• Current actin labeling methods lack dynamic control over labeling intensity.

Purpose of the Study:

• To develop an improved actin labeling tool with light-inducible control.
• To enhance the visualization of F-actin dynamics in live cells.
• To minimize cellular stress and perturbations associated with actin labeling.

Main Methods:

• Design and construction of a novel actin-binding peptide, LILAC, incorporating the light-oxygen-voltage 2 (LOV2) protein.
• Utilizing light to modulate the binding affinity of LILAC to actin filaments.
• Live-cell imaging techniques to observe F-actin dynamics under varying light conditions.

Main Results:

• LILAC demonstrates light-dependent binding to actin filaments.
• Light modulation of LILAC allows for enhanced imaging of F-actin dynamics.
• LILAC exhibits reduced cellular perturbations and sickness compared to traditional Lifeact.

Conclusions:

• LILAC offers a controllable and less perturbing method for visualizing actin dynamics in live cells.
• Light-activated actin labeling provides a novel approach for advanced cell imaging.
• This tool has the potential to improve the accuracy and reliability of studies involving F-actin.