Protein Photoconductors and Photodiodes

Tokita, Yuichi; Yamada, Seiji; Luo, Wei; Gotō, Yoshio; Bouley-Ford, Nicole; Nakajima, Hiroshi; Watanabe, Yoshihito

doi:10.1002/anie.201103341

Cited by 20 publications

(8 citation statements)

References 22 publications

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“…In devices utilizing photosystem I, the photocurrent is attributed to a series of reactions in which the chlorophyll is photoexcited and the electron transferred to the electrodes through a redox chain . In contrast, for systems using zinc‐substituted cytochrome c (Zn‐cyt c ), the photocurrent is described in terms of an intramolecular ET mechanism, where photoexcitation is followed by charge transport through specific channels in the protein structure, as previously reported experimentally and theoretically …”

mentioning

confidence: 84%

Photoswitchable Sn‐Cyt c Solid‐State Devices

Nakamaru¹,

Scholz

Ford

et al. 2017

Advanced Materials

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Electron transfer across proteins plays an important role in many biological processes, including those relevant for the conversion of solar photons to chemical energy. Previous studies demonstrated the generation of photocurrents upon light irradiation in a number of photoactive proteins, such as photosystem I or bacteriorhodopsin. Here, it is shown that Sn-cytochrome c layers act as reversible and efficient photoelectrochemical switches upon integration into large-area solid-state junctions. Photocurrents are observed both in the Soret band (λ = 405 nm) and in the Q band (λ = 535 nm), with current on/off ratios reaching values of up to 25. The underlying modulation in charge-transfer rate is attributed to a hole-transport channel created by the photoexcitation of the Sn-porphyrin.

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mentioning

confidence: 84%

Photoswitchable Sn‐Cyt c Solid‐State Devices

Nakamaru¹,

Scholz

Ford

et al. 2017

Advanced Materials

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“…94 Furthermore, a hemoprotein reconstituted with zinc porphyrin is also expected to be useful for generating a biodevice. [95][96][97] Our group has recently prepared 6-Cyt H63C , where a zinc protoporphyrin IX (ZnPP) moiety was introduced onto the surface of Cyt H63C by a maleimide-thiol linkage, thereby producing a supramolecular assembly of zinc-substituted hemoproteins (Fig. 7a).…”

Section: Hemoprotein Assembly On a Gold Electrodementioning

confidence: 99%

Supramolecular assembling systems formed by heme–heme pocket interactions in hemoproteins

2012

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A native protein in a biological system spontaneously produces large and elegant assemblies via self-assembly or assembly with various biomolecules which provide non-covalent interactions. In this context, the protein plays a key role in construction of a unique supramolecular structure operating as a functional system. Our group has recently highlighted the structure and function of hemoproteins reconstituted with artificially created heme analogs. The heme molecule is a replaceable cofactor of several hemoproteins. Here, we focus on the successive supramolecular protein assemblies driven by heme-heme pocket interactions to afford various examples of protein fibers, networks and three-dimensional clusters in which an artificial heme moiety is introduced onto the surface of a hemoprotein via covalent linkage and the native heme cofactor is removed from the heme pocket. This strategy is found to be useful for constructing hybrid materials with an electrode or with nanoparticles. The new systems described herein are expected to lead to the generation of various biomaterials with functions and characteristic physicochemical properties similar to those of hemoproteins.

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“…Besides the speculative interest of investigating with electronic/electrochemical methods how biological matter interacts with the environment, a major interest in bioelectronics is to suit some peculiar abilities of living matter (for example, to identify some specific molecules, to detect and use light, and so on) for practical applications, from energy harvesting to sensing action. In this framework, an increasing number of biomolecules, mainly proteins and aptamers, have been selected, produced, and analyzed with different experimental and theoretical techniques to be part of electronic devices [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Reaction Center of Rhodobacter Sphaeroides, a Photoactive Protein for pH Sensing: A Theoretical Investigation of Charge Transport Properties

Alfinito

Reggiani

2022

Applied Sciences

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In the perspective of an increasing attention to ecological aspects of science and technology, it is of interest to design devices based on architectures of modular, low cost, and low-pollutant elements, each of them able to perform simple duties. Elemental devices may be themselves green as, for example, proteins able to make simple actions, like sensing. To this aim, photosensitive proteins are often considered because of the possibility of transferring their specific reaction to visible light into electronic signals. Here, we investigate the expected electrical response of the photoactive protein Reaction Center (bRC) of Rhodobacter Sphaeroides within the proteotronics, a recent branch of molecular electronics that evaluates the electrical properties of a protein by using an impedance network protein analog based on the protein tertiary structure and the degree of electrical connectivity between neighboring amino acids. To this purpose, the linear and nonlinear regimes of the electrical response to an applied bias are studied when the protein is in its native state or in an active state. In the linear response regime, results evidence a significant difference in the electrical properties of bRC when the pH value of the solution in which the protein is embedded changes from acid to basic. In the non-linear response regime, the current-voltage characteristics experimentally reported in the recent literature are interpreted in terms of a sequential tunneling mechanism of charge transfer. The qualitative agreement of present findings with available experiments strongly suggests the use of this protein as a bio-rheostat or a pH sensor.

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Protein Photoconductors and Photodiodes

Cited by 20 publications

References 22 publications

Photoswitchable Sn‐Cyt c Solid‐State Devices

Photoswitchable Sn‐Cyt c Solid‐State Devices

Supramolecular assembling systems formed by heme–heme pocket interactions in hemoproteins

Reaction Center of Rhodobacter Sphaeroides, a Photoactive Protein for pH Sensing: A Theoretical Investigation of Charge Transport Properties

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