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Related Concept Videos

Protein Folding01:25

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...
Protein Folding01:22

Protein Folding

Overview
Protein Folding01:22

Protein Folding

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Protein Organization01:13

Protein Organization

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Protein Organization01:24

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

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Formation of Ordered Biomolecular Structures by the Self-assembly of Short Peptides
07:26

Formation of Ordered Biomolecular Structures by the Self-assembly of Short Peptides

Published on: November 21, 2013

Self-assembling peptides: sequence, secondary structure in solution and film formation.

Roberta Gambaretto1, Lorenzo Tonin, Carlo Di Bello

  • 1Department of Chemical Process Engineering, University of Padova, Padova, Italy.

Biopolymers
|June 4, 2008
PubMed
Summary

Peptide sequence and structure influence self-assembly into stable films. Not all sequences with alternating polar/nonpolar amino acids form beta-sheets, yet still self-assemble, even with added RGD sequences for biomimetic scaffolds.

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Last Updated: Jul 4, 2026

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Published on: August 20, 2018

Area of Science:

  • Biomaterials Science
  • Supramolecular Chemistry
  • Biophysics

Background:

  • Peptides with alternating charged and hydrophobic amino acids often form stable beta-sheet structures.
  • These structures can aggregate into insoluble macroscopic materials under physiological conditions.

Purpose of the Study:

  • To investigate the relationship between peptide sequence, solution conformation, and film-forming capacity.
  • To design and study analogues of a known self-assembling peptide with varied residues but similar polar/nonpolar periodicity.

Main Methods:

  • Circular dichroism spectroscopy was used to evaluate peptide conformation in solution.
  • Inverted optical microscopy was employed to observe film formation after saline addition and drying.

Main Results:

  • Peptide conformation correlated with observed film-forming capacity.
  • Polar/nonpolar periodicity alone is insufficient to guarantee beta-sheet formation and film assembly.
  • Conformations other than beta-sheet can also facilitate self-assembly.
  • Incorporation of the RGD (arginine-glycine-aspartic acid) sequence did not inhibit self-assembly of a known self-assembling peptide.

Conclusions:

  • Peptide sequence design requires more than just polar/nonpolar periodicity for predictable beta-sheet formation and film assembly.
  • Self-assembly into films can occur through non-beta-sheet conformations.
  • The RGD sequence can be integrated into self-assembling peptides without compromising their assembly properties, offering potential for biomimetic scaffold design.