An external point-charge model for bacteriorhodopsin to account for its purple color

1980 ◽  
Vol 102 (27) ◽  
pp. 7945-7947 ◽  
Author(s):  
Koji Nakanishi ◽  
Valeria Balogh-Nair ◽  
Maria Arnaboldi ◽  
Kazuo Tsujimoto ◽  
Barry Honig
Keyword(s):  
Point Charge ◽  
Point Charge Model ◽  
External Point ◽  
Charge Model ◽  
Purple Color

ChemInform Abstract: AN EXTERNAL POINT-CHARGE MODEL FOR BACTERIORHODOPSIN TO ACCOUNT FOR ITS PURPLE COLOR

1981 ◽  
Vol 12 (14) ◽  
Author(s):  
K. NAKANISHI ◽  
V. BALOGH-NAIR ◽  
M. ARNABOLDI ◽  
K. TSUJIMOTO ◽  
B. HONIG
Keyword(s):  
Point Charge ◽  
Point Charge Model ◽  
External Point ◽  
Charge Model ◽  
Purple Color

Bacteriorhodopsin analogue from anthryl chromophores

1990 ◽  
Vol 68 (3) ◽  
pp. 383-389 ◽  
Author(s):  
Anil K. Singh ◽  
Mita Roy
Keyword(s):  
Absorption Band ◽  
Dark Adaptation ◽  
Point Charge ◽  
Spectrophotometric Analysis ◽  
Reaction Centre ◽  
Point Charge Model ◽  
External Point ◽  
Charge Model ◽  
Nuclear Magnetic Resonance Spectra ◽  
Opsin Shift

Preparation and properties of the bacteriorhodopsin (bR) analogue having the 3,7-dimethyl-9-(9-anthryl)-2E,4E,6E,8E-nonatetraenal (12) chromophore is described. Synthesis of the chromophore has been achieved by successive introduction of C5 units to 9-anthraldehyde (3) via the Horner reaction. The all-trans chromophore has been characterized by its ultraviolet–visible and 1H nuclear magnetic resonance spectra. Incubation of 12 with bacterioopsin suspension (prepared by photobleaching of bR isolated from Halobacteriumhalobium) at ambient temperature in the dark gave the new bR analogue 15, which showed an absorption band at 545 nm, and an opsin shift of 5575 cm−1. The new pigment is stable to hydroxylamine in the dark. It showed light–dark adaptation with the light-adapted form absorbing at a slightly red-shifted value of 550 nm. All-trans-retinal did not replace the anthryl chromophore in competitive bindings. Photolysis of the bR analogue 15, followed by difference spectrophotometric analysis, indicated formation of a photoproduct with an absorption band near 400 nm. The results are discussed in terms of the stereoelectronic requirements of the bR reaction centre. Keywords: bacteriorhodopsin (bR), retinal analogue, reconstitution, opsin shift (OS), external point charge model (EPC).

Bacteriorhodopsins containing cyanine dye chromophores. Support for the external point-charge model

1983 ◽  
Vol 105 (3) ◽  
pp. 646-648 ◽  
Author(s):  
Fadila Derguini ◽  
Charles G. Caldwell ◽  
Michael G. Motto ◽  
Valeria Balogh-Nair ◽  
Koji Nakanishi
Keyword(s):  
Point Charge ◽  
Cyanine Dye ◽  
Point Charge Model ◽  
External Point ◽  
Charge Model

ChemInform Abstract: AN EXTERNAL POINT-CHARGE MODEL FOR WAVELENGTH REGULATION IN VISUAL PIGMENTS

1980 ◽  
Vol 11 (7) ◽  
Author(s):  
B. HONIG ◽  
U. DINUR ◽  
K. NAKANISHI ◽  
V. BALOGH-NAIR ◽  
M. A. GAWINOWICZ ◽  
...  
Keyword(s):  
Point Charge ◽  
Visual Pigments ◽  
Point Charge Model ◽  
External Point ◽  
Charge Model ◽  
Wavelength Regulation

ChemInform Abstract: BACTERIORHODOPSINS CONTAINING CYANINE DYE CHROMOPHORES. SUPPORT FOR THE EXTERNAL POINT-CHARGE MODEL

1983 ◽  
Vol 14 (22) ◽  
Author(s):  
F. DERGUINI ◽  
C. G. CALDWELL ◽  
M. G. MOTTO ◽  
V. BALOGH-NAIR ◽  
K. NAKANISHI
Keyword(s):  
Point Charge ◽  
Cyanine Dye ◽  
Point Charge Model ◽  
External Point ◽  
Charge Model

An external point-charge model for wavelength regulation in visual pigments

1979 ◽  
Vol 101 (23) ◽  
pp. 7084-7086 ◽  
Author(s):  
Barry Honig ◽  
Uri Dinur ◽  
Koji Nakanishi ◽  
Valeria Balogh-Nair ◽  
Mary Ann Gawinowicz ◽  
...  
Keyword(s):  
Point Charge ◽  
Visual Pigments ◽  
Point Charge Model ◽  
External Point ◽  
Charge Model ◽  
Wavelength Regulation

Additions and Corrections - Bacteriorhodopsins Containing Cyanine Dye Chromophores. Support for the External Point-Charge Model

1983 ◽  
Vol 105 (13) ◽  
pp. 4501-4501
Author(s):  
F. Derguini ◽  
C. Caldwell ◽  
M. Motto ◽  
V. Balogh-Nair ◽  
K. Nakanishi
Keyword(s):  
Point Charge ◽  
Cyanine Dye ◽  
Point Charge Model ◽  
External Point ◽  
Charge Model
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