Related Experiment Video
Updated: May 30, 2026
08:59
4D Imaging of Protein Aggregation in Live Cells
Published on: April 5, 2013
Protein aggregation in a membrane environment
Galyna Gorbenko1, Valeriya Trusova
1Department of Biological and Medical Physics, V.N. Karazin Kharkov National University, Kharkov, Ukraine.
Advances in Protein Chemistry and Structural Biology
|August 18, 2011
Summary
Protein aggregation in biological membranes, particularly amyloid fibril formation, is linked to diseases. Lipid-protein interactions are key, influencing protein structure and association within membranes.
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Biology
Background:
- Biological membranes regulate physiological and pathological processes.
- Protein aggregation, especially amyloid fibril formation, is implicated in fatal diseases.
- Lipid-protein interactions are hypothesized to mediate amyloid nucleation and toxicity.
Purpose of the Study:
- To review the role of lipid-protein interactions in protein aggregation within biological membranes.
- To explore factors that enhance protein self-association on membrane templates.
- To survey experimental techniques for studying aggregated species in membrane systems.
Main Methods:
- Review of existing literature on protein aggregation and membrane biophysics.
- Analysis of factors influencing protein self-association (conformation, crowding, orientation).
- Discussion of experimental techniques for detection and characterization of membrane-bound aggregates.
Main Results:
- Lipid bilayers offer environments favoring protein aggregation.
- Factors like conformational changes, protein crowding, and specific orientations promote aggregation.
- Electrostatic, hydrophobic, and hydrogen-bonding interactions are crucial in modulating membrane-associated protein aggregation.
Conclusions:
- Lipid-protein interactions are central to understanding disease-related protein aggregation.
- Membrane environment significantly influences protein aggregation propensity.
- Advanced experimental methods are vital for characterizing these aggregates.
Related Concept Videos
00:59Mechanisms of Membrane Domain Formation
Different physical properties of lipids and proteins allow them to localize and form distinct islands or domains in the membrane. Some membrane domains are formed due to protein-protein interactions, whereas others are formed due to the presence of specific lipids such as sphingolipids and sterols—for example, large proteins, such as bacteriorhodopsin, aggregate and create distinct domains.
Another mechanism for membrane domain formation involves membrane proteins interacting with cytoskeletal...
Another mechanism for membrane domain formation involves membrane proteins interacting with cytoskeletal...
03:03Amyloid Fibrils
Amyloid fibrils are aggregates of misfolded proteins. Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils.
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining, normally used to...
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining, normally used to...
01:18Membrane Domains
The membrane domains concentrate specific lipids and proteins at one place within the membrane, which helps in cell signaling, adhesion, and other critical cellular processes. These domains can differ in size, composition, function, and lifespan.
Protein Domains
The membrane comprises a group of distinct proteins responsible for carrying out a cell's specific function. For example, the plasma membrane of the human sperm, or a single germ cell, contains a unique set of proteins in the anterior...
Protein Domains
The membrane comprises a group of distinct proteins responsible for carrying out a cell's specific function. For example, the plasma membrane of the human sperm, or a single germ cell, contains a unique set of proteins in the anterior...
03:00Molecular Chaperones and Protein Folding
The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
The...
The...
01:24Protein Diffusion in the Membrane
Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
01:09Multi-pass Transmembrane Proteins and β-barrels
In multi-pass transmembrane proteins, the polypeptide chain crosses the membrane more than once. The transmembrane polypeptide chain either forms an α-helix or β-strand structure. α-Helix containing multi-pass transmembrane proteins are ubiquitous, whereas β-strand containing ones are mainly found in gram-negative bacteria, mitochondria, and chloroplasts.
α-Helix containing multi-pass transmembrane proteins
Multi-pass transmembrane proteins such as G-protein-linked receptors (GPCRs) and...
α-Helix containing multi-pass transmembrane proteins
Multi-pass transmembrane proteins such as G-protein-linked receptors (GPCRs) and...