Related Experiment Video
Updated: Jan 24, 2026
10:02
Neutron Spin Echo Spectroscopy as a Unique Probe for Lipid Membrane Dynamics and Membrane-Protein Interactions
Published on: May 27, 2021
4.5K
Synthetic cell-like membrane interfaces for probing dynamic protein-lipid interactions.
Spencer T Glantz1, Erin E Berlew1, Brian Y Chow1
1Department of Bioengineering, University of Pennsylvania, Philadelphia, PA, United States.
Methods in Enzymology
|June 4, 2019
Summary
Researchers developed synthetic cell-like droplets to rapidly screen protein-lipid interactions at membrane interfaces. This method enables analysis of protein dynamics and competitive binding using standard microscopy, aiding in understanding membrane-associated proteins.
Area of Science:
- Biochemistry
- Cell Biology
- Biophysics
Background:
- Understanding protein-lipid interactions is crucial for cell membrane function.
- Existing methods for studying these interactions can be complex and time-consuming.
- A need exists for rapid, versatile screening platforms for membrane-associated proteins.
Purpose of the Study:
- To develop a novel method for rapidly screening protein interactions with membrane-like interfaces.
- To create a platform for engineering novel lipid-interacting protein tools.
- To investigate protein-interface association/dissociation dynamics and competitive binding.
Main Methods:
- Preparation of water-in-oil (w/o) emulsions with lipid-stabilized droplet interfaces.
- Utilizing fluorescently labeled proteins within synthetic cell-like droplets.
- Automated inverted fluorescence microscopy for imaging and analysis.
- Development of protocols for droplet formation, imaging assays, and data analysis.
Main Results:
- Demonstrated the ability to rapidly screen relative protein binding to tunable lipid interfaces.
- Enabled spatiotemporally resolved analysis of protein-interface dynamics.
- Showcased the use of a light-regulated photoreceptor (BcLOV4) as a positive control for optogenetic membrane recruitment.
Conclusions:
- The developed w/o emulsion droplet system provides a powerful and accessible platform for studying protein-lipid interactions.
- This method facilitates rapid screening, dynamic analysis, and engineering of membrane-interacting proteins.
- The system has potential applications in understanding signaling mechanisms and developing optogenetic tools.
Related Concept Videos
02:04Protein-protein Interfaces
14.6K
Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
14.6K
02:04Protein-Protein Interfaces
4.4K
4.4K
01:16Introduction to Membrane Proteins
80.8K
The cell membrane, or plasma membrane, is an ever-changing landscape. It is described as a fluid mosaic where various macromolecules are embedded in the phospholipid bilayer. Among the macromolecules are proteins. The protein content varies across cell types. For example, mitochondrial inner membranes contain ~76% protein content, while myelin contains ~18% protein content. Individual cells contain many types of membrane proteins—red blood cells contain over 50—and different cell...
80.8K
01:32Membrane Lipids
33.7K
Lipids are an essential component of all biological membranes. The average lipid content in mammalian membranes is 50%, though it can be as low as 20% in the inner mitochondrial membrane or as high as 80% in the myelin sheath present around the nerve cells.
Phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, and sphingomyelin are the most common phospholipids present in mammalian membranes. At physiological pH, phosphatidylserine is negatively charged, while the other three...
Phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, and sphingomyelin are the most common phospholipids present in mammalian membranes. At physiological pH, phosphatidylserine is negatively charged, while the other three...
33.7K
01:19Protein Dynamics in Living Cells
2.6K
Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
2.6K
01:30Membrane Proteins
29.3K
Plasma membranes have integral transmembrane proteins involved in facilitated transport. These proteins are collectively referred to as transport proteins, and they function as either channels for the material or as carriers themselves. Channel proteins have hydrophilic domains exposed to the intracellular and extracellular fluids and a hydrophilic channel through their core that provides a hydrated opening for solutes to pass through the membrane layers. Passage through the channel allows...
29.3K