Molecular mechanism of ion transport in bacteriorhodopsin: insights from crystallographic, spectroscopic, kinetic, and mutational studies

Article Abstract:

A multidisciplinary approach to the study of bacteriorhodopsin has provided about free energy gain after absorption of a photon that is found to consist of electrostatic changes at the retinal Schiff base and steric conflicts with protein residues and bound water, introduced by photoisomerization of the retinal. Asp-85 in bacteriorhodopsin, the transport requires that the counterion Asp-76 be initially uprotonated so it can function as proton acceptor.

Photons, Spectrum analysis, Spectroscopy

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Mechanism of photocurrent generation from bacteriorhodopsin on gold electrodes

Article Abstract:

Research was conducted to examine the photoelectrochemical responses of bacteriorhodopsin (bR) on gold electrodes. Two types of photocurrents were found, both originating in the excitation of bR, by using a gold electrode as substrate. The magnitude of the first photocurrent paralleled the amount of surface oxide up to about one monolayer of Au2O3. The second type may arise from simple charging through proton release/uptake by bR.

Gold, Electrodes

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Kinetic optimization of bacteriorhodopsin films for holographic interferometry

Article Abstract:

A proton-diffusion-limited, two-state model (PDL2 model) for bacteriorhodopsin is introduced that allows modeling mathematically the optical excitation and thermal relaxation processes for both high and low humidities in bacteriorhodopsin films. Kinetically optimized bacteriorhodopsin films yield a more-than-30-fold improvement of sensitivity in holographic interferometry compared to dry bacteriorhodopsin films.

Materials, Excited state chemistry, Holographic interferometry

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