Energy propagation along polypeptide α-helix: Experimental data and ab initio zone structure

Area of Science:

• Biophysics
• Materials Science
• Computational Chemistry

Background:

• The electronic properties of biological molecules are not fully understood.
• Periodic polypeptides (PP) are fundamental structures in biology.

Purpose of the Study:

• To investigate the electronic band structure of periodic polypeptides (PP).
• To experimentally measure the electrical properties of Müller cell intermediate filaments (IFs).
• To explore potential semiconductor applications of biological molecules.

Main Methods:

• Ab initio analysis of PP band structure using CRYSTAL-17 software.
• Density Functional Theory (DFT) calculations.
• Experimental measurement of current-voltage (I/V) characteristics of porcine retina Müller cell intermediate filaments (IFs).

Main Results:

• The bandgap of PP was found to be weakly dependent on composition, with asymptotic values in the 0.43 - 0.63 eV range.
• Electron mobility in the PP conductive band was estimated to be approximately half that of polycrystalline silicon.
• Experimental I/V characteristics confirmed that Müller cell intermediate filaments (IFs) behave as semiconductors.

Conclusions:

• Periodic polypeptides possess semiconductor properties with potential for novel electronic applications.
• The electronic behavior of biological structures like intermediate filaments aligns with semiconductor theory.
• These findings suggest new directions for research in bioelectronics and materials science.