无细胞基因表达是在限定的最小环境中研究生物系统的重要研究工具,并且在生物技术中具有广阔的应用前景。开发控制 DNA 模板进行无细胞表达的方法对于复杂生物途径的精确调节和合成细胞的使用非常重要,特别是使用可见光等远程、非破坏性刺激。在这里,我们合成了蓝光激活的 DNA 部分,可以严格调节游离 RNA 和蛋白质的合成。我们发现这种蓝光激活的 DNA 可以与我们之前生成的紫外线 (UV) 光激活的 DNA 正交地启动表达,我们用它来生成双波长光控的无细胞 AND 门。通过将这些正交的光激活 DNA 封装到合成细胞中,我们使用蓝色和紫外光的两种重叠模式来提供对逻辑门的精确时空控制。我们的蓝色和紫外正交光激活 DNA 将为精确控制生物学和医学中的无细胞系统打开大门。
无细胞基因表达是在限定的最小环境中研究生物系统的重要研究工具,并且在生物技术中具有广阔的应用前景。开发控制 DNA 模板进行无细胞表达的方法对于复杂生物途径的精确调节和合成细胞的使用非常重要,特别是使用可见光等远程、非破坏性刺激。在这里,我们合成了蓝光激活的 DNA 部分,可以严格调节游离 RNA 和蛋白质的合成。我们发现这种蓝光激活的 DNA 可以与我们之前生成的紫外线 (UV) 光激活的 DNA 正交地启动表达,我们用它来生成双波长光控的无细胞 AND 门。通过将这些正交的光激活 DNA 封装到合成细胞中,我们使用蓝色和紫外光的两种重叠模式来提供对逻辑门的精确时空控制。我们的蓝色和紫外正交光激活 DNA 将为精确控制生物学和医学中的无细胞系统打开大门。
Cloaked Caged Compounds: Chemical Probes for Two-Photon Optoneurobiology
作者:Matthew T. Richers、Joseph M. Amatrudo、Jeremy P. Olson、Graham C. R. Ellis-Davies
DOI:10.1002/anie.201609269
日期:2017.1.2
Caged neurotransmitters, in combination with focused light beams, enable precise interrogation of neuronal function, even at the level of single synapses. However, most caged transmitters are, surprisingly, severe antagonists of ionotropic gamma‐aminobutyric acid (GABA) receptors. By conjugation of a large, neutral dendrimer to a caged GABA probe we introduce a “cloaking” technology that effectively
Optically Selective Two-Photon Uncaging of Glutamate at 900 nm
作者:Jeremy P. Olson、Hyung-Bae Kwon、Kevin T. Takasaki、Chiayu Q. Chiu、Michael J. Higley、Bernardo L. Sabatini、Graham C. R. Ellis-Davies
DOI:10.1021/ja4019379
日期:2013.4.24
We have synthesized a 7-diethylaminocoumarin (DEAC) derivative that allows wavelength-selective two-photon uncaging at 900 nm versus 720 nm. This new caging chromophore, called DEAC450, has an extended pi-electron moiety moiety at the 3-position that shifts the absorption spectrum maximum of DEAC from 375 to 450 nm. Two-photon excitation at 900 nm was more than 60-fold greater than at 720 nm. Two-photon uncaging of DEAC450-Glu at 900 nm at spine heads on pyramidal neurons in acutely isolated brain slices generated postsynaptic responses that were similar to spontaneous postsynaptic excitatory miniature currents, whereas significantly higher energies at 720 nm evoked no currents. Since many nitroaromatic caged compounds are two-photon active at 720 nm, optically selective uncaging of DEAC450-caged biomolecules at 900 nm may allow facile two-color optical interrogation of bimodal signaling pathways in living tissue with high resolution for the first time.