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Related Concept Videos

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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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

Electronic structures and conductivity in peptide nanotubes.

R Takahashi1, H Wang, J P Lewis

  • 1Department of Physics and Astronomy, Brigham Young University, Provo, Utah 84602, USA.

The Journal of Physical Chemistry. B
|July 13, 2007
PubMed
Summary

Modified peptide nanotubes with aromatic rings show reduced band gaps. Calculations reveal large tunneling beta factors, indicating poor conductivity for these peptide materials.

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Area of Science:

  • Materials Science
  • Computational Chemistry
  • Nanotechnology

Background:

  • Self-assembling cyclic D,L-peptide nanotubes are electronically insulating with wide band gaps (> 4 eV).
  • Aromatic rings in peptide side chains are hypothesized to influence electronic properties.

Purpose of the Study:

  • To investigate the effect of aromatic rings on the electronic band gap of peptide nanotubes.
  • To calculate the electron tunneling probability and assess the conductivity of modified peptide nanotubes.

Main Methods:

  • Utilized ab initio electronic structure calculations.
  • Employed the complex band structure approach to compute tunneling beta(E)-factors.
  • Analyzed three types of peptide nanotubes: (L-Gln, D-Ala)(4), (L-Gln, D-Leu)(4), and (L-Gln, D-Phe)(4).

Main Results:

  • The presence of aromatic rings significantly reduces the band gap of peptide nanotubes.
  • Calculated tunneling beta(E)-factors are large near the midgap energy.
  • High beta(E) values indicate that these modified peptide nanotubes are poor conductors of electrons.

Conclusions:

  • Aromatic side chains can tune the electronic properties of peptide nanotubes.
  • Peptide nanotubes, even with modifications, exhibit poor electron tunneling conductivity due to large beta(E) values near midgap.