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Related Concept Videos

Metal-Ligand Bonds02:51

Metal-Ligand Bonds

The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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...
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
Ligand Binding Sites02:40

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...
Peptide Bonds02:43

Peptide Bonds

A peptide bond covalently attaches amino acids through a dehydration reaction. One amino acid's carboxyl group and another amino acid's amino group combine, releasing a water molecule. The resulting bond is the peptide bond. The products that such linkages form are peptides. As more amino acids join this growing chain, the resulting chain is a polypeptide. Each polypeptide has a free amino group at one end. This end has the N-terminal, or the amino-terminal, and the other end has a free...

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Peptide interactions with metal and oxide surfaces.

Anne Vallee1, Vincent Humblot, Claire-Marie Pradier

  • 1Laboratoire de Réactivité de Surface, UMR CNRS 7197, Université Pierre et Marie Curie Paris 6, 4 place Jussieu, Case 178, 75252 Paris Cedex 05, France.

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Understanding peptide-surface interactions is key for bio-interfaces. Sulfur-containing peptides bind strongly to metals like gold, while carboxylates interact with oxides, guiding applications in biotechnology and biomaterials.

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Area of Science:

  • Biomaterials Science
  • Surface Chemistry
  • Biotechnology

Background:

  • Growing interest in bio-interfaces for medical and biotechnology applications necessitates understanding protein-solid surface interactions.
  • Existing research bridges single amino acid interactions with macroscopic biocompatibility studies, but a molecular-level understanding of peptide-surface binding is needed.

Purpose of the Study:

  • To provide a molecular-level characterization of peptide interactions with metal and oxide surfaces.
  • To bridge the gap between fundamental amino acid-surface studies and applied biocompatibility research.
  • To identify trends and guiding principles for peptide-surface interactions.

Main Methods:

  • Utilized surface science tools and macroscopic characterization techniques.
  • Incorporated modeling methods to analyze peptide-surface interactions.
  • Reviewed studies on peptides of varying sizes interacting with metal, oxide, and nanoparticle surfaces.

Main Results:

  • Sulfur in cysteine-containing peptides drives strong binding to metal surfaces, especially gold.
  • Intermolecular forces like hydrogen bonds can lead to self-assembly and chiral arrangements.
  • Carboxylate groups preferentially bind to oxide surfaces (titania, silica) via electrostatic interactions.
  • Basic residues (e.g., arginine) play a key role in high molecular weight peptide interactions with oxides.
  • Peptide-nanoparticle interactions show similar trends, with sulfur-containing peptides binding to gold nanoparticles and aromatic nitrogen-containing peptides to various inorganic nanoparticles.
  • Genetically engineered peptides for inorganics (GEPIs) exhibit high affinity for inorganic surfaces, including sulfur-free sequences for gold and platinum.

Conclusions:

  • Peptide-surface interactions are driven by specific chemical functionalities (sulfur, carboxylates, amino groups) and intermolecular forces.
  • Understanding these molecular interactions enables the design of functional peptides for applications like biocompatibility, biomimetics, and tissue engineering.
  • GEPIs represent a promising class of peptides for targeted inorganic surface functionalization.