Related Experiment Video
Updated: May 12, 2026
15:04
PeptiQuick, a One-Step Incorporation of Membrane Proteins into Biotinylated Peptidiscs for Streamlined Protein Binding Assays
Published on: November 2, 2019
Structure based descriptors for the estimation of colloidal interactions and protein aggregation propensities
Michael Brunsteiner1, Michaela Flock, Bernd Nidetzky
1Research Center Pharmaceutical Engineering, Graz, Austria.
Plos One
|April 9, 2013
Summary
Controlling protein aggregation is key for biopharmaceutical development. Molecular dynamics simulations show net-charge and dipole moment significantly influence colloidal interactions, guiding better aggregation prediction algorithms.
Area of Science:
- Biochemistry and Biophysics
- Computational Chemistry
- Pharmaceutical Sciences
Background:
- Protein aggregation poses significant challenges in biopharmaceutical formulation development.
- Understanding the factors governing protein-protein interactions is crucial for preventing aggregation.
Purpose of the Study:
- To quantitatively assess the contributions of net-charge, dipole moment, and surface patch characteristics to protein colloidal interactions.
- To provide guidelines for improving algorithms that predict protein aggregation propensities.
Main Methods:
- Utilized molecular dynamics simulations with a simplified protein model.
- Analyzed the impact of varying net-charge, dipole moment, and surface patch sizes on colloidal interactions.
Main Results:
- Protein aggregation propensity strongly correlates with net-charge and dipole moment.
- Variations in net-charge and dipole moment within typical globular protein ranges have comparable effects on interactions.
- No clear trends in aggregation were observed by altering hydrophobic or charged patch sizes alone.
Conclusions:
- Net-charge and dipole moment are primary drivers of protein colloidal interactions relevant to aggregation.
- Current models may overestimate the role of surface patch size in aggregation prediction.
- Findings offer a clear direction for developing more accurate protein aggregation prediction algorithms.
More Related Videos
Related Concept Videos
02:35Noncovalent Attractions in Biomolecules
Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
02:04Protein-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 polypeptide...
01:24Protein 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.
The primary structure of a protein is its amino acid sequence.
02:40Ligand 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-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...
02:18The 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: