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Related Concept Videos

Protein-protein Interfaces02:04

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 polypeptide...
Protein and Protein Structure02:15

Protein and Protein Structure

Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
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Noncovalent Attractions in Biomolecules02:35

Noncovalent 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.
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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.
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Protein Folding

Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
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Updated: May 24, 2026

Covalent Immobilization of Proteins for the Single Molecule Force Spectroscopy
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Covalent Immobilization of Proteins for the Single Molecule Force Spectroscopy

Published on: August 20, 2018

Disentangling protein-silica interactions.

Lara Giussani1, Gloria Tabacchi, Enrica Gianotti

  • 1Dipartimento Chimica IFM and Centro di Eccellenza NIS, Università di Torino, Via P. Giuria 7, 10125 Turin, Italy.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|February 22, 2012
PubMed
Summary
This summary is machine-generated.

We modeled protein-loaded water droplets interacting with silica surfaces. Droplet adhesion occurs when both the droplet and surface are negatively charged, mediated by water and ions.

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Area of Science:

  • Biomaterials Science
  • Surface Chemistry
  • Computational Modeling

Background:

  • Understanding protein interactions with surfaces is crucial for biomaterial development.
  • Mesoporous silica materials are promising for protein encapsulation.
  • The behavior of charged protein-loaded droplets at interfaces requires further investigation.

Purpose of the Study:

  • To model and understand the interaction between a protein-loaded water droplet and silica surfaces.
  • To investigate the influence of electrostatic surface charge on droplet adhesion.
  • To elucidate the roles of water and counter-ions in protein-surface interactions.

Main Methods:

  • Computational modeling of a 7 nm water droplet containing a negatively charged globular protein.
  • Simulation of droplet interaction with flat silica surfaces under varying electrostatic conditions.

Main Results:

  • Droplet adhesion to silica surfaces is dependent on electrostatic surface charge.
  • Adhesion occurs when both the water droplet and the silica surface possess a negative charge.
  • Water and charge-balancing counter-ions play a critical role in mediating protein-surface adhesion.

Conclusions:

  • The electrostatic interaction between charged protein-loaded droplets and surfaces dictates adhesion.
  • These findings are relevant for designing methods to encapsulate proteins within mesoporous silica for bioinorganic hybrid production.