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Membrane Domains

Membrane 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...

Mechanisms of Membrane Domain Formation

Mechanisms 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...

Conservation of Protein Domains Over Different Proteins

Conservation of Protein Domains Over Different Proteins

Protein domains are small structurally independent units that are part of a single amino acid chain. Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to...

Conserved Binding Sites

Conserved Binding Sites

Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally...

Autophagy

Autophagy

Autophagy is a self-digesting process by which a cell protects itself from threats both within and outside the cell, ranging from abnormal proteins to invading bacteria. In this process, obsolete components of the cell and invading microbes are degraded by hydrolytic enzymes active in an acidic environment of the lysosomal lumen.
An autophagic pathway consists of a series of signaling events activated in response to diverse stress and physiological conditions such as food deprivation,...

The Equilibrium Binding Constant and Binding Strength

The Equilibrium Binding Constant and Binding Strength

The equilibrium binding constant (Kb) quantifies the strength of a protein-ligand interaction. Kb can be calculated as follows when the reaction is at equilibrium:

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Related Experiment Video

Updated: Feb 2, 2026

Method for Efficient Refolding and Purification of Chemoreceptor Ligand Binding Domain

Method for Efficient Refolding and Purification of Chemoreceptor Ligand Binding Domain

Published on: December 12, 2017

Membrane-binding domains in autophagy.

Takuo Osawa¹, Jahangir Md Alam¹, Nobuo N Noda¹

¹Institute of Microbial Chemistry (BIKAKEN), Microbial Chemistry Research Foundation, Tokyo 141-0021, Japan.

Chemistry and Physics of Lipids

|November 12, 2018

Summary

Autophagy uses specific protein domains to guide membrane rearrangements for cellular cleanup. This review details how these membrane-binding domains in autophagy-related (Atg) proteins facilitate autophagosome formation and function.

Keywords:

Amphipathic helix Atg protein Autophagy Membrane-binding domain Phosphatidylinositol 3-phosphate

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Method for Efficient Refolding and Purification of Chemoreceptor Ligand Binding Domain

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Area of Science:

Cell Biology
Molecular Biology

Background:

Autophagy is a fundamental cellular process for degrading damaged components.
Autophagosome formation requires intricate membrane dynamics regulated by autophagy-related (Atg) proteins.

Purpose of the Study:

To review current knowledge on membrane-binding domains and motifs in Atg proteins.
To discuss the specific roles of these domains in the autophagy pathway.

Main Methods:

Literature review of studies on autophagy and Atg proteins.
Analysis of protein structures and functions related to membrane binding.

Main Results:

Atg proteins possess diverse membrane-binding domains and motifs.
These domains are crucial for autophagosome biogenesis and cargo recognition.

Conclusions:

Understanding Atg protein domains is key to deciphering autophagy mechanisms.
Targeting these domains could offer therapeutic strategies for diseases involving autophagy.