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Protein Folding

Protein Folding

Protein Folding

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

Peptide Bonds

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...

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 Organization

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Protein and Protein Structure

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.
A protein's shape is critical to its function. For example, an enzyme can...

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Related Experiment Video

Updated: May 22, 2026

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

Published on: February 6, 2020

Solution structural characterization of coiled-coil peptide-polymer side-conjugates.

Jessica Y Shu¹, Reidar Lund, Ting Xu

¹Department of Materials Science and Engineering, University of California, Berkeley, California, United States.

Biomacromolecules

|May 12, 2012

Summary

Researchers studied coiled-coil peptide-poly(ethylene glycol) (PEG) conjugates to understand hybrid biomaterials. They found PEG chains slightly compressed the peptide helix bundle structure, aiding future material design.

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Area of Science:

Biomaterials Science
Polymer Chemistry
Structural Biology

Background:

Understanding protein-polymer interactions is crucial for designing novel hybrid biomaterials.
Coiled-coil peptide-poly(ethylene glycol) (PEG) conjugates serve as model systems for detailed structural analysis.

Purpose of the Study:

To systematically characterize the solution structure of coiled-coil peptide-PEG side-conjugates.
To determine the conformation of conjugated PEG chains and their effect on peptide structure.

Main Methods:

Utilized circular dichroism (CD), dynamic light scattering (DLS), and small-angle X-ray scattering (SAXS).
Applied a cylindrical form factor model for overall size and shape determination.
Developed a Gaussian chain model attached to a cylinder bundle for detailed PEG chain analysis.

Main Results:

Peptide-polymer side-conjugates maintained their helix bundle structure in solution.
Conjugated PEG chains exhibited a slightly compressed conformation compared to free PEG.
The study elucidated PEG conformation around the peptide and its structural impact.

Conclusions:

Detailed structural characterization provides foundational knowledge for designing peptide-polymer hybrid biomaterials.
The findings contribute to the rational design of new soft materials with controlled peptide and polymer conformations.