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Related Concept Videos

Protein Organization01:13

Protein Organization

Overview
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 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

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Protein Folding01:22

Protein Folding

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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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Updated: May 9, 2026

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

Multiple, consecutive, fully-extended 2.0₅-helix peptide conformation.

Cristina Peggion1, Alessandro Moretto, Fernando Formaggio

  • 1Institute of Biomolecular Chemistry, CNR, Padova Unit, Department of Chemistry, University of Padova, 35131, Padova, Italy.

Biopolymers
|July 30, 2013
PubMed
Summary

The peptide 2.0(5)-helix, a fully extended structure, is confirmed to exist in crystals and solutions. This conformation is ideal for molecular spacers but can reversibly convert to a 3(10)-helix in polar solvents.

Keywords:
2.05 peptide helixCα-tetrasubstituted α-amino acidsX-ray diffractionconformational energy calculationsfully-extended peptide conformationinfrared absorptionnuclear magnetic resonance

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Peptide Chemistry

Background:

  • The 2.0(5)-helix is a specific peptide conformation.
  • Understanding peptide structures is crucial for molecular design.

Purpose of the Study:

  • To confirm the existence and characterize the 2.0(5)-helix.
  • To explore its structural features, stability, and potential applications.

Main Methods:

  • X-ray diffraction for crystalline state analysis.
  • Spectroscopic techniques (e.g., NMR, IR) for solution state analysis.
  • Conformational energy calculations.

Main Results:

  • Experimental authentication of the 2.0(5)-helix in both crystalline and solution states.
  • Detailed geometrical and 3D structural features were elucidated.
  • The helix is the most common conformation for specific C(α)-tetrasubstituted α-amino acids.
  • Sensitivity to solvent polarity and reversible conversion to the 3(10)-helix were observed.

Conclusions:

  • The 2.0(5)-helix is a validated peptide structure with unique properties.
  • Its extended nature makes it a promising molecular spacer.
  • Its reversible transformation to the 3(10)-helix offers potential for molecular spring applications.