Photochemical and functional properties of bacteriorhodopsins formed from 5,6-dihydro- and 5,6-dihydrodesmethylretinals.

Photochemical and functional properties of bacteriorhodopsins formed from 5,6-dihydro- and 5,6-dihydrodesmethylretinals.
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由 5,6-二氢-和 5,6-二氢去甲基视黄醛形成的细菌视紫红质的光化学和功能特性。

DOI:
10.1021/bi00505a031
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发表时间:
1981
期刊:
影响因子:
2.9
通讯作者:
Crouch,R
Crouch,R
中科院分区:
生物学3区
文献类型:
--
作者:
Mao,B;Govindjee,R;Ebrey,TG;Arnaboldi,M;Balogh-Nair,V;Nakanishi,K;Crouch,R

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放大图片作者:Boryeu Mao,Rajni Govindjee,托马斯G. Ebrey,* Maria Arnaboldi,Valeria Balogh-Nair,Koji Nakanishi,* and Rosalie Crouch* 摘要:合成了5,6-Dihydroretinal和5,6-dihydro-1,1,5,9,13-desmethylretinal,它们的全反式异构体显示形成细菌视紫红质(紫膜蛋白)的色素类似物(λ max分别在475和460 nm)。与天然色素相比,该色素对5,6-二氢菌紫质的最大吸收峰从发色团的质子化Schiff碱的最大吸收峰偏移较小,表明在环己基环附近存在类似于控制视色素视紫红质的负电荷。这两种色素类似物都经历可逆的光诱导光谱位移,反映了色素的循环光反应。这些结果表明,不存在C-5-C-6双键和5个甲基基团的视黄醛并不消除这些化合物的光化学性质。
Boryeu Mao, Rajni Govindjee, Thomas G. Ebrey,* Maria Arnaboldi, Valeria Balogh-Nair, Koji Nakanishi,* and Rosalie Crouch* abstract: 5, 6-Dihydroretinal and 5, 6-dihydro-1, 1, 5, 9, 13-desmethylretinal are synthesized, and their all-trans isomers are shown toform pigment analogues (Xmax at 475 and 460 nm, respectively) of bacteriorhodopsin (purple membrane protein). The shift of the absorption maximum of the pigment from that of the protonated Schiff base of the chromophore for 5, 6-dihydrobacteriorhodopsin is small compared to that of the native pigment, suggesting that negativecharges similar to those controlling the of visual pigment rhodopsin exist near the cyclohexyl ring. Both pigment analogues undergo reversible light-induced spectral shifts reflecting cyclic pho-toreactions of the pigments. These results indicate that the absence of the C-5-C-6 double bond and of the five methyl groups of retinal does not abolish the photochemistry of these
细菌视紫红质类似物的生理学和结构研究。
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