Proteins as Bioelectronic Materials: Electron Transport Through Solid-State, Protein Monolayer Junctions - Condensed Matter > Mesoscale and Nanoscale PhysicsReportar como inadecuado




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Abstract: Electron transfer ET through proteins, a fundamental element of manybiochemical reactions, has been studied intensively in solution. We report theresults of electron transport ETp measurements across proteins, sandwichedbetween two solid electrodes with a long-range goal of understanding in how farprotein properties are expressed and can be utilized in such a configuration.While most such studies to date were conducted with one or just a few moleculesin the junction, we present the high yield, reproducible preparation of largearea monolayer junctions of proteins from three different families: AzurinAz, a blue-copper ET protein, Bacteriorhodopsin bR, a membraneprotein-chromophore complex with a proton pumping function, and Bovine SerumAlbumin BSA. Surprisingly, the current-voltage I-V measurements on suchjunctions, which are highly reproducible, show relatively minor differencesbetween Az and bR, even though the latter lacks a known ET function. ETp acrossboth Az and bR is much more efficient than across BSA, but also for the latterthe currents are still high, and the decay coefficients too low to beconsistent with coherent tunneling. Rather, inelastic hopping is proposed todominate ETp in these junctions. Other features such as asymmetrical I-V curvesand distinct behavior of different proteins can be viewed as molecularsignatures in the solid-state conductance.



Autor: Izhar Ron, Lior Sepunaro, Stella Izhakov, Noga Friedman, Israel Pecht, Mordechai Sheves, David Cahen

Fuente: https://arxiv.org/



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