Light-Triggered Biomolecular Wires and Resistors

  • ChemPubSoc Europe Logo
  • Author: ChemBioChem
  • Published Date: 05 November 2018
  • Source / Publisher: ChemBioChem/Wiley-VCH
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA
thumbnail image: Light-Triggered Biomolecular Wires and Resistors

Related Societies

Multiheme cytochromes are proteins notable for their electron transfer properties. As Nature's solution to long-range electron transfer, these proteins are spanned by chains of closely packed heme groups. Electron transfer across and between these cytochromes occurs by complementary Fe(III)/Fe(II) transitions at neighboring centers.


Julea N. Butt and colleagues, University of East Anglia, UK, have engineered multiheme cytochromes that can be used as biohybrid phototransducers for converting light into electricity. The team site-selectively functionalized the small tetraheme cytochrome (STC) with Ru(II)(2,2'-bipyridine)3 at five different sites.


When irradiated with visible light, the Ru(II)(2,2'-bipyridine)3 photo-trigger injects photoenergized electrons into the STC's four-heme chain. These electrons become trapped in the protein when the oxidized Ru complex receives electrons from a sacrificial electron donor such as EDTA (ethylenediaminetetraacetic acid).


The biohybrid materials act as phototransducers of light to electricity. Their behavior varies depending on the site of the functionalization and, thus, electron injection. Some of the materials act more like resistors and others like wires. The researchers believe these findings could pave the way for using photosensitized multiheme cytochromes as light-driven, light-responsive, or light-harvesting components of bioelectronic circuits.


 

Article Views: 440

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

Bookmark and Share

If you would like to reuse any content, in print or online, from ChemistryViews.org, please contact us first for permission. more


CONNECT:

ChemistryViews.org on Facebook

ChemistryViews.org on Twitter ChemistryViews.org on YouTube ChemistryViews.org on LinkedIn Sign up for our free newsletter


A product of ChemPubSoc Europe (16 European Chemical Societies)and Wiley-VCH