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Protein-protein Interfaces

Protein-protein Interfaces

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...

Ligand Binding Sites

Ligand Binding Sites

Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...

Protein Networks

Protein Networks

An organism can have thousands of different proteins, and these proteins must cooperate to ensure the health of an organism. Proteins bind to other proteins and form complexes to carry out their functions. Many proteins interact with multiple other proteins creating a complex network of protein interactions.
These interactions can be represented through maps depicting protein-protein interaction networks, represented as nodes and edges. Nodes are circles that are representative of a protein,...

Protein Organization

Protein Organization

Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
The primary structure of a protein is its amino acid sequence....

Protein-Protein Interfaces

Protein-Protein Interfaces

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...

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Related Experiment Video

Updated: Oct 6, 2025

Author Spotlight: Advancing Cell Membrane Biophysics - Exploring Interactions and Challenges Through Experimental and Computational Approaches

Author Spotlight: Advancing Cell Membrane Biophysics - Exploring Interactions and Challenges Through Experimental and Computational Approaches

Published on: September 1, 2023

Insights into lipid-protein interactions from computer simulations.

D P Tieleman¹, B I Sejdiu², E A Cino¹

¹Centre for Molecular Simulation and Department of Biological Sciences, University of Calgary, 2500 University Dr. NW, Calgary, AB T2N 1N4 Canada.

Biophysical Reviews

|January 20, 2022

Summary

This summary is machine-generated.

Lipid-protein interactions are crucial for membrane protein function and structure. Unique lipid environments surround each protein, influencing function and drug mechanisms.

Keywords:

Lipid-protein interactions Martini Membrane proteins Molecular dynamics simulations

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Native Cell Membrane Nanoparticles System for Membrane Protein-Protein Interaction Analysis

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Published on: July 16, 2020

Area of Science:

Biochemistry
Biophysics
Structural Biology

Background:

Lipid-protein interactions are fundamental to membrane protein function.
These interactions influence membrane structure and the efficacy of hydrophobic drugs.
Understanding these complex relationships is key to advancing molecular biology.

Purpose of the Study:

To investigate the unique lipid environments surrounding different membrane proteins.
To explore how lipid environments vary among G protein-coupled receptors (GPCRs) and influence their conformational states.
To examine lipid-protein coupling mechanisms and interactions with ion channels.

Main Methods:

Comparative analysis of membrane proteins within complex lipid mixtures.
Investigating G protein-coupled receptors (GPCRs) and their lipid interactions, focusing on cholesterol distribution.
Utilizing model proteins to study the coupling between protein conformation and membrane properties.
Applying computational methods to study lipid and lipid-like molecule interactions with ion channels.

Main Results:

Each membrane protein exhibits a distinct lipid environment within a complex lipid mixture.
GPCRs show variations in their lipid environments, influenced by protein family and conformational state, particularly regarding cholesterol.
Coupling between protein conformation and local membrane properties was observed in model systems.

Conclusions:

Lipid-protein interactions are essential for membrane protein function, structure, and drug interactions.
Future research directions include advanced force fields like Martini 3, interactive visualization tools, and enhanced sampling techniques.