Site-Specific Incorporation of Selenocysteine by Genetic Encoding as a Photocaged Unnatural Amino Acid
作者:Adarshi P. Welegedara、Luke A. Adams、Thomas Huber、Bim Graham、Gottfried Otting
DOI:10.1021/acs.bioconjchem.8b00254
日期:2018.7.18
Selenocysteine (Sec) is a naturally occurring amino acid that is also referred to as the 21st amino acid. Site-specificincorporation of Sec into proteins is attractive, because the reactivity of a selenol group exceeds that of a thiol group and thus allows site-specific protein modifications. It is incorporated into proteins by an unusual enzymatic mechanism which, in E. coli and other organisms,
Genetic Encoding of Photocaged Cysteine Allows Photoactivation of TEV Protease in Live Mammalian Cells
作者:Duy P. Nguyen、Mohan Mahesh、Simon J. Elsässer、Susan M. Hancock、Chayasith Uttamapinant、Jason W. Chin
DOI:10.1021/ja412191m
日期:2014.2.12
demonstrate the evolution of the PylRS/tRNACUA pair for geneticallyencoding photocaged cysteine. By characterizing the incorporation in Escherichia coli and mammaliancells, and the photodeprotection process in vitro and in mammaliancells, we establish conditions for rapid efficient photodeprotection to reveal native proteins in live cells. We demonstrate the utility of this approach by rapidly activating
我们展示了用于遗传编码光笼半胱氨酸的 PylRS/tRNACUA 对的进化。通过表征大肠杆菌和哺乳动物细胞中的掺入,以及体外和哺乳动物细胞中的光脱保护过程,我们建立了快速有效的光脱保护条件,以揭示活细胞中的天然蛋白质。我们通过在单细胞照射后快速激活 TEV 蛋白酶来证明这种方法的实用性。
A Light‐Controllable Chemical Modulation of m
<sup>6</sup>
A RNA Methylation
its biological activity. Short UV light exposure of cells treated with that caged molecule in a few minutes resulted in a considerable hypermethylation of m6A modification in transcriptome RNAs, implicating a rapid release of the parent active compound. This study validates for the first time the photo-activatable small organic molecular concept in the field of RNA epigenetic research, which represents
vacuum-stable-by-design MALDImatrix enables long MALDIMSimaging measurements of at least 72 hours. Using a photo-removable 4,5-dimethoxy-2-nitrobenzyl (DMNB) group, organic synthesis transformed the widely used, but unfortunately very volatile MALDImatrix 2,5-dihydroxy acetophenone (2,5-DHAP) into a vacuum-stable matrix, which can be uncaged by the MALDIlaser in the ion source and then perform as
作者:Yan Zhang、Shibo Liu、Fuhu Guo、Shan Qin、Nan Zhou、Ziqi Liu、Xinyuan Fan、Peng R. Chen
DOI:10.1021/jacs.4c02052
日期:2024.6.5
immunotherapeutic applications, direct and quantitative detection of tumor–T cell interactions within a live-cell context remains challenging. We herein report a photocatalytic live-cell interaction labeling strategy (CAT-Cell) relying on the bioorthogonal decaging of quinone methide moieties for sensitive and selective investigation and quantification of tumor–T cell interactions. By developing quinone methide-derived
有效的抗肿瘤免疫取决于肿瘤和细胞毒性免疫细胞(尤其是细胞毒性T细胞)之间的特异性结合。尽管研究这些细胞间相互作用对于表征免疫反应和指导免疫治疗应用至关重要,但在活细胞环境中直接定量检测肿瘤 - T 细胞相互作用仍然具有挑战性。我们在此报告了一种光催化活细胞相互作用标记策略(CAT-Cell),该策略依赖于醌甲基化物部分的生物正交解衰,以灵敏、选择性地研究和量化肿瘤-T细胞相互作用。通过开发针对捕获细胞-细胞相互作用 (CCIs) 进行优化的醌甲基化物衍生探针,我们证明了 CAT-Cell 检测由各种类型的受体-配体对(例如 CD40-CD40L、TCR-pMHC)引导的 CCI 的能力,以及进一步量化了肿瘤与 T 细胞相互作用的强度,这对于评估抗肿瘤免疫反应至关重要。我们进一步应用 CAT-Cell 对小鼠模型的脾细胞和实体瘤样本上的肿瘤特异性 T 细胞相互作用进行离体定量。最后,通过将 CAT-Cell