PMID: 9440316Jan 24, 1998Paper

Light induced redox reactions involving mammalian ferritin as photocatalyst

Journal of Photochemistry and Photobiology. B, Biology
V V NikandrovM Grätzel

Abstract

Under excitation by visible light the iron storage protein ferritin catalyses the reduction of cytochrome c and viologens as well as the oxidation of carboxylic acids, thiol compounds, and sulfite. The photochemically active element of ferritin is its mineral ferrihydrite semiconductor core. Band-gap excitation of these microcrystals leads to generation of electron-hole pairs that are sufficiently long-lived and reactive to engage in redox reactions with components of the medium. Photoreduction of cytochrome c and viologens occurs due to electron transfer from the conduction band of the iron oxide cluster through the protein shell surrounding the ferritin core. Laser photolysis coupled with time-resolved kinetics spectroscopy showed the electron transfer to propylviologen sulfonate to proceed in the microsecond time range. In the absence of electron acceptor at pH < 7, light excitation results in photodissolution of the iron oxide cluster with concomitant formation of Fe(II). These novel findings concerning the photocatalytic activity of ferritin with its inherent biological implications are discussed.

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Citations

Jun 1, 2010·Biochimica Et Biophysica Acta·F Marc MichelDaniel R Strongin
Mar 11, 2010·Biochimica Et Biophysica Acta·Richard K WattD Matthew Graff
Jun 7, 2016·Inorganic Chemistry·Natalie SaenzJose M Dominguez-Vera
Nov 25, 2014·Chemical Reviews·Kourosh Honarmand EbrahimiWilfred R Hagen
Mar 2, 2017·Geochemical Transactions·Timothy A Doane
Mar 24, 2017·Nanotechnology·Cameron R OlsenRichard K Watt
Feb 20, 2018·Frontiers in Microbiology·Peter J Gwynne, Maurice P Gallagher
Jun 9, 2005·Chemical Reviews·Konrad SzaciłowskiGrazyna Stochel
Feb 17, 2015·Chemical Reviews·Günther JutzAlexander Böker
May 25, 2004·Inorganic Chemistry·Daniel EnsignTrevor Douglas

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