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Related Concept Videos

Protein Folding01:25

Protein Folding

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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.
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
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Peptide Bonds02:43

Peptide Bonds

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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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Protein Organization01:24

Protein Organization

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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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Assembly of Cytoskeletal Filaments01:18

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Cytoskeletal filaments are polymeric forms of smaller protein subunits. However, individual cytoskeletal filaments may easily disassemble or associate with other similar filaments to form rigid structures. Microfilaments, made of actin monomers, rely on actin-binding proteins to form bundles and create networks of individual actin filaments. Microtubules rely on microtubule-associated proteins (MAPs) to form sturdy cylindrical structures. However, the proteins involved in forming complex...
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Protein Complex Assembly02:41

Protein Complex Assembly

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Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
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Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

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Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
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Related Experiment Video

Updated: Jul 17, 2025

Synthesis and Characterization of 1,2-Dithiolane Modified Self-Assembling Peptides
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Synthesis and Characterization of 1,2-Dithiolane Modified Self-Assembling Peptides

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Noncovalent Peptide Assembly Enables Crystalline, Permutable, and Reactive Thiol Frameworks.

Selina S Hess1, Francesco Coppola1, Viet Thuc Dang1

  • 1Department of Chemistry, University of Illinois Chicago, Chicago, Illinois 60607, United States.

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Researchers developed new thiol-containing porous materials using peptide assembly. These materials show promise for applications like toxic metal ion removal and nitric oxide delivery.

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Biomaterials

Background:

  • Thiols are versatile but their high reactivity complicates synthesis of thiol-containing porous materials.
  • Noncovalent peptide assembly offers a mild route to control material structure and function.

Purpose of the Study:

  • To synthesize and characterize well-defined thiol-containing porous materials using peptide self-assembly.
  • To explore the structural diversity and cooperative noncovalent interactions in these frameworks.
  • To demonstrate the functional capabilities of these materials in chemical reactions and ion uptake.

Main Methods:

  • Noncovalent peptide assembly for framework synthesis.
  • Single-crystal X-ray diffraction for structural determination.
  • Molecular dynamics calculations for understanding assembly principles.
  • Demonstration of single-crystal-to-single-crystal reactions.

Main Results:

  • Successfully synthesized and structurally characterized diverse thiol-containing peptide frameworks.
  • Revealed rich sequence-structure relationships and cooperative noncovalent interactions.
  • Demonstrated framework reactivity including toxic metal ion coordination (Cd2+, Pb2+, Hg2+), selective Hg2+ uptake, and redox transformations.
  • Identified a framework supporting thiol-nitrosothiol interconversion for nitric oxide delivery.

Conclusions:

  • Peptide-based thiol frameworks offer a modular and accessible platform for designing functional porous materials.
  • The well-defined nature and reactivity of these materials accelerate the development of advanced applications.
  • These findings pave the way for new biomaterials and chemical sensing technologies.