Isomerization in Fluorescent Protein Chromophores Involves Addition/Elimination
作者:Jian Dong、Fardokht Abulwerdi、Anthony Baldridge、Janusz Kowalik、Kyril M. Solntsev、Laren M. Tolbert
DOI:10.1021/ja803416h
日期:2008.10.29
The green fluorescent protein (GFP) chromophore undergoes both photochemical and thermal isomerizations. Typically, the Z form is more stable and undergoes photochemical conversion to the E form followed by thermal reversion over a period of seconds or minutes. Although the mechanism of the thermal reversion has been the subject of some investigations, the surprisingly low activation energy for this
绿色荧光蛋白 (GFP) 生色团经历光化学和热异构化。通常,Z 型更稳定,经过光化学转化为 E 型,然后在数秒或数分钟内发生热逆转。尽管热逆转的机制一直是一些研究的主题,但该过程令人惊讶的低活化能并没有引发任何争议。我们现在表明,发色团在 E 和 Z 形式中都出奇地稳定,并且容易的热逆转是新型亲核加成/消除机制的结果。这一观察结果可能对荧光蛋白中此类过程的干预以及闪烁和点燃具有影响。
Emission enhancement of GFP chromophore in aggregated state <i>via</i> combination of self-restricted effect and supramolecular host–guest complexation
作者:Shanshan Ge、Hongping Deng、Yue Su、Xinyuan Zhu
DOI:10.1039/c7ra00974g
日期:——
enhancement of GFP-like chromophores in the aggregated state is a great challenge due to its free conformational motions and aggregation-induced quenching (ACQ) features. Herein, the emission response of a GFP chromophore (GFPc) in its aggregated state has been greatly enhanced via combination of self-restricted effect and supramolecular host–guestcomplexation. Specifically, the benzene group of the GFP
A SNAP-tag fluorogenic probe mimicking the chromophore of the red fluorescent protein Kaede
作者:Kwan Ho Jung、Matthew Fares、Leeann S. Grainger、Charles H. Wolstenholme、Anna Hou、Yu Liu、Xin Zhang
DOI:10.1039/c8ob01483c
日期:——
Self-labelling protein tags with fluorogenic probes serve as great fluorescence imaging tools to understand key questions of protein dynamics and functions in living cells. In the present study, we report a SNAP-tag fluorogenic probe 4c mimicking the chromophore of the redfluorescent protein Kaede. The molecular rotor properties of 4c were utilized as a fluorogenic probe for SNAP-tag, such that conjugation
带有荧光探针的自标记蛋白质标签可作为出色的荧光成像工具,用于了解活细胞中蛋白质动力学和功能的关键问题。在本研究中,我们报告了一个SNAP标签荧光探针4c,该探针模仿红色荧光蛋白Kaede的发色团。4c的分子转子特性被用作SNAP-tag的荧光探针,因此与SNAPf蛋白的缀合可抑制扭曲的分子内电荷转移,从而触发荧光。与SNAPf结合后,4c的荧光强度增强了约90倍,具有快速标记动力学(k 2 = 15 000 M -1 s -1)。生化和光谱学研究证实,荧光需要在Cys 145和4c之间形成折叠的SNAPf· 4c共价共轭物。共聚焦显微镜和流式细胞术表明4c能够检测SNAPf蛋白质或与感兴趣的蛋白质融合的SNAPf在活细胞中。这项工作提供了一个框架,可以将大家族的FP发色团发展为用于自标记蛋白质标签的荧光探针。
Convenient Preparation of 4-Alkylidene-1H-imidazol-5(4H)-one Derivatives from Imidate and Aldehydes by a Solvent-Free Cycloaddition under Microwaves
作者:Ghislaine Kerneur、Jean Michel Lerestif、Jean Pierre Bazureau、Jack Hamelin
DOI:10.1055/s-1997-1177
日期:1997.3
4-Alkylidene-1H-imidazol-5(4H)-one derivatives 4 (aromatic, aliphatic and heteroaromatic) are obtained in good to excellent yields by 1,3-dipolar cycloaddition by using solvent-free conditions under microwave irradiation from imidate 1, aldehydes 2 and dry acetic acid as catalyst. Similar cycloadducts 4 were obtained by cycloaddition from imidate 1 and aldimines 3 as dipolarophiles under microwaves.