Proton release from Stentor photoreceptors in the excited states.
Proton release from Stentor photoreceptors in the excited states.
复制标题
Stentor 光感受器在激发态下释放质子。
DOI：
10.1016/s0006-3495(81)84811-4
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发表时间：
1981
影响因子：
3.4
通讯作者：
Robinson,GW
中科院分区：
文献类型：
--
作者：
Song,PS;Walker,EB;Auerbach,RA;Robinson,GW
稳态和皮秒脉冲激发的嗜光性趋光性受体分离Stentor coeruleus产生的阴离子物种主要在激发单重态，虽然在基态的中性光感受器被专门激发。体内相同的感光体也从其阴离子物质的激发态发射荧光，激发光谱与基态中中性物质的吸收光谱相同。质子从光感受器发色团（stentorin;金丝桃素共价连接到蛋白质）的激发态解离有效地发生在小于10 ps。本文还简要讨论了光感受器瞬时质子释放在Stentor光反应信号转导中的可能作用。
Steady-state and picosecond pulse excitations of the photophobic-phototactic receptors isolated from Stentor coeruleus produced anionic species predominantly in the excited singlet state, although neutral photoreceptors in the ground state were exclusively excited. The same photoreceptor in vivo also emits fluorescence from the excited state of its anionic species, with an excitation spectrum identical to the absorption spectrum of the neutral species in the ground state. The excited state dissociation of protons from the photoreceptor chromophore (stentorin; hypericin covalently linked to protein) efficiently occurs in less than 10 ps. A possible role of the transient-proton release from the photoreceptor, in the signal transduction photoresponse of Stentor, is briefly discussed.