Bacteriorhodopsin (BR570) bathochromic band shift in an external electric field

Borisevitch, Galina P.; Лукашев, Е. П.; Kononenko, A.A.; Rubin, A. B.

doi:10.1016/0005-2728(79)90178-6

Cited by 26 publications

(6 citation statements)

References 6 publications

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“…In particular, both classes have an identical light absorbing chromophore, the 11-cis-retinal, whose photoisomerization is the primary event in their photochemical cycles. Relatively weak electric fields between 10 5 − 10 7 V/m affect the photoenergetic reaction and absorption spectrum of bacteriorhodopsin [31,32,33], as well as the cis-to-trans isomerization of many other complex molecules [34,35]. In Ref.…”

Section: Modelmentioning

confidence: 99%

A New Type of Radical-Pair-Based Model for Magnetoreception

Stoneham

Gauger

Porfyrakis

et al. 2012

Biophysical Journal

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Certain migratory birds can sense the Earth's magnetic field. The nature of this process is not yet properly understood. Here we offer a simple explanation according to which birds literally see the local magnetic field through the impact of a physical rather than a chemical signature of the radical pair: a transient, long-lived electric dipole moment. Based on this premise, our picture can explain recent surprising experimental data indicating long lifetimes for the radical pair. Moreover, there is a clear evolutionary path toward this field-sensing mechanism: it is an enhancement of a weak effect that may be present in many species.

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Section: Modelmentioning

confidence: 99%

A New Type of Radical-Pair-Based Model for Magnetoreception

Stoneham

Gauger

Porfyrakis

et al. 2012

Biophysical Journal

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“…For quite a while the effects of external electric fields on the BR photocycle were known. 139 In combination with mutated BR-D85N, an interesting new effect was reported, the first "gating mechanism" in BR. 140 This may point into a new direction of research on BR in long-term storage applications, but today it is not possible to estimate whether this will become technically competitive.…”

Section: A 2-d Data Storagementioning

confidence: 99%

“…For quite a while the effects of external electric fields on the BR photocycle were known . In combination with mutated BR-D85N, an interesting new effect was reported, the first “gating mechanism” in BR .…”

Section: A 2-d Data Storagementioning

confidence: 99%

Bacteriorhodopsin as a Photochromic Retinal Protein for Optical Memories

2000

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“…Excitation of an oriented suspension of purple membranes with a pulsed laser beam provides new possibilities for studying the bacteriorhodopsin photocycle (16,17). The preparation of dipole oriented dried layers of purple membranes is also of considerable interest (18)(19)(20).…”

Section: Introductionmentioning

confidence: 99%

Interfacial electric polarizability of purple membranes in solution

Todorov¹,

Sokerov²,

Stoylov³

1982

Biophysical Journal

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An investigation of the scattered light (lambda = 632.8 nm) from purple membrane suspensions with different concentrations subjected to external AC and DC electric fields has been carried out. The electric pulses used were in the field strength range 0-3.2 X 10(4) Vm-1 and the frequency range 10 Hz-1 MHz, the pulse duration being less than or equal to 0.5 s. A concentration dependence of the relative changes in the scattered light intensity was obtained, the effect being positive on orienting the suspensions by an AC field at 1 and 10 kHz, and negative in the case of a DC field. The negative effects in the diluted samples decrease and turn positive as the strength of the field increases. The positive effects show the existence of an interfacial polarizability along the plane of the membrane, and the negative ones suggest the presence of a permanent dipole moment (p), perpendicular to the plane of the membrane. The values of gamma (induced polarizability) and p were found to be on the order of 10(-28)-10(-29) Fm2 and 10(-24) Cm, respectively. An explanation in terms of membrane aggregation for the observed dependence on concentration is given.

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Bacteriorhodopsin (BR570) bathochromic band shift in an external electric field

Cited by 26 publications

References 6 publications

A New Type of Radical-Pair-Based Model for Magnetoreception

A New Type of Radical-Pair-Based Model for Magnetoreception

Bacteriorhodopsin as a Photochromic Retinal Protein for Optical Memories

Interfacial electric polarizability of purple membranes in solution

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