Photoswitchable Pseudoirreversible Butyrylcholinesterase Inhibitors Allow Optical Control of Inhibition in Vitro and Enable Restoration of Cognition in an Alzheimer’s Disease Mouse Model upon Irradiation
Photoresponsive Supramolecular Architectures Based on Polypeptide Hybrids
摘要:
Self-aggregation has recently emerged as an efficient tool for the production of well-ordered supramolecular structures at the nanometric scale. In this framework, peptides offer important advantages as building blocks because of their biocompatibility and 3D-structural/functional diversities. The chemical diversity of peptides may be further expanded by use of noncoded amino acids. In the present work, we focused our attention on two known photoswitchable azobenzene-containing alpha-amino acids and used them as initiators for the reversible modulation of the cis/trans conformational states of two poly(gamma-benzyl-l-glutamate)-based hybrid molecules with either C-2 or C-3 symmetry. The microscopic photoresponsive self-assembly of these compounds was examined in detail. Moreover, these hybrids were exploited in the construction of macroscopic supramolecular architectures via the electrospinning technique. Finally, after appropriate thiol functionalization, we fabricated and characterized dimeric and trimeric gold nanoparticle/polypeptide hybrid systems.
Activation of Sirtuin 2 Inhibitors Employing Photoswitchable Geometry and Aqueous Solubility
作者:Christoph W. Grathwol、Nathalie Wössner、Steven Behnisch‐Cornwell、Lukas Schulig、Lin Zhang、Oliver Einsle、Manfred Jung、Andreas Link
DOI:10.1002/cmdc.202000148
日期:2020.8.5
derivatization with long‐chain fatty acids yielded potent sirtuin2inhibitors, featuring another intriguing aspect of azo‐based photoswitches. In these compounds, switching to the Z isomer increased aqueoussolubility and thereby enhanced biological activity by up to a factor of 21. The biological activity of two compounds was confirmed by hyperacetylation of sirtuin specific histone proteins in a cell‐based activity
Reversible fluorescence photoswitching of RSA-AZO dyad 1 was clearly demonstrated in an acidicaqueous solution. The fluorescence photoswitching mechanism is based on the reversible ringopening/closing reactions of the RSA unit induced by a photochromic pK(a) change along with the photoisomerization of the AZO unit.
Bridging the Binding Sites 2.0: Photoswitchable Dualsteric Ligands for the Cannabinoid 2 Receptor
作者:Sophie A. M. Steinmüller、Anna Tutov、James N. Hislop、Michael Decker
DOI:10.1021/acschemneuro.3c00509
日期:2023.10.18
The cannabinoidreceptor2 (CB2R) has high, unexploited therapeutic potential in several central nervous system disorders due to its involvement in neuroinflammatory processes and pathologies like neurodegeneration. Dualsteric/bitopicligands are currently developed to achieve receptor subtype selectivity and biased signaling. To obtain a molecular tool compound with photoswitchable potential dualsteric
大麻素受体 2 (CB 2 R) 由于参与神经炎症过程和神经变性等病理,因此在多种中枢神经系统疾病中具有尚未开发的高治疗潜力。目前开发了双立体/双位配体以实现受体亚型选择性和偏向信号传导。为了获得具有光可切换潜在双立体特性的分子工具化合物,我们应用了两种不同的方法通过光致变色单元将正变构调节剂与正位激动剂连接起来。我们表征了所有化合物的光物理性质,并确定了内化、钙动员和 BRET 研究的功效。我们报告了第一个潜在的双立体光开关配体,用于研究 CB 2 R 相关病理的分子机制。化合物17 - para是一种亚微摩尔“顺式”激动剂,与其反式光异构体相比,其效力高出 10 倍以上,并且可以高度时空控制 CB 2 R 激活。
Efficient Preparation of Nitrosoarenes for the Synthesis of Azobenzenes
作者:Beate Priewisch、Karola Rück-Braun
DOI:10.1021/jo048544x
日期:2005.3.1
Reaction conditions are described for the oxidation of anilines furnishing nitrosoarenes and the synthesis of unsymmetrically substituted azobenzenes. In a comparative study, the catalytic oxidation of methyl 4-aminobenzoate by hydrogen peroxide was investigated, and SeO2 proved to be superior or equal to methyl trioxorhenium (MTO) and Na2WO4, respectively. Nevertheless, the application of the inexpensive, environmentally friendly, Oxone in a biphasic system proved to be more efficient, and a variety of useful nitrosoarenes for the synthesis of azo compounds were prepared in high yield and purity on a large scale.