Dye-functionalized phosphate-binding macrocycles: from nucleotide to G-quadruplex recognition and “turn-on” fluorescence sensing
作者:Aleksandr S. Oshchepkov、Oksana Reznichenko、Dan Xu、Boris S. Morozov、Anton Granzhan、Evgeny A. Kataev
DOI:10.1039/d1cc04096k
日期:——
A PBM-dye architecture to design “turn-on” fluorescent receptors for G-quadruplexes of DNA is presented, which involves the connection of phosphate binding macrocycles (PBM) with dyes.
Templating Irreversible Covalent Macrocyclization by Using Anions
作者:Evgeny A. Kataev、Grigory V. Kolesnikov、Rene Arnold、Herman V. Lavrov、Victor N. Khrustalev
DOI:10.1002/chem.201204306
日期:2013.3.11
Inorganic anions were used as templates in the reaction between a diamine and an activated diacid to form macrocyclic amides. The reaction conditions were found to perform the macrocyclization sufficiently slow to observe a template effect. A number of analytical methods were used to clarify the reaction mechanisms and to show that the structure of the intermediate plays a decisive role in determining
Hybrid Macrocycles for Selective Binding and Sensing of Fluoride in Aqueous Solution
作者:Aleksandr S. Oshchepkov、Tatiana A. Shumilova、Siva R. Namashivaya、Olga A. Fedorova、Pavel V. Dorovatovskii、Viktor N. Khrustalev、Evgeny A. Kataev
DOI:10.1021/acs.joc.7b03077
日期:2018.2.16
was found to bind fluoride with the highest affinity (105 M–1) and selectivity among the synthesized receptors. It was the only receptor that demonstrated fluorescence increase upon addition of fluoride. Other titration experiments with halides and oxyanions led to an anion-induced aggregation and fluorescence quenching. The mechanism of the particular turn-on fluorescence for fluoride was explained by
报道了含有铵和氢键供体基团的杂化大环的合成和阴离子结合特性。在pH 6.2的10 mM MES缓冲溶液中研究了受体的性质,在该溶液中,受体在仲胺基团上带有两个正电荷。发现受体1以最高的亲和力(10 5 M –1)和选择性结合了氟化物。它是唯一在添加氟化物后荧光增强的受体。其他使用卤化物和氧阴离子的滴定实验导致阴离子诱导的聚集和荧光猝灭。氟化物的特殊开启荧光的机理由受体1的能力解释封装几种氟阴离子。多个阴离子配位导致叔胺基的质子化,并随后阻碍PET的过程。1 H和19 F NMR滴定,氯离子络合物的单晶X射线结构以及DFT计算表明,1可以完美地在内部空腔中容纳两个氟化物阴离子,而仅容纳一个氯离子,而第二个氯离子保留在外部配位球中。因此,大小选择性的重要性反映在水溶液中分子的集体行为中,代表了设计用于氟化物在水溶液中起作用的高选择性探针的新策略。
Conformational Selection in Anion Recognition: cGMP-Selective Binding by a Naphthalimide-Functionalized Amido-Amine Macrocycle
作者:Aleksandr S. Oshchepkov、Tatiana A. Shumilova、Mario Zerson、Robert Magerle、Victor N. Khrustalev、Evgeny A. Kataev
DOI:10.1021/acs.joc.9b00947
日期:2019.7.19
cyclic guanosine monophosphate (cGMP) in an aqueous solution. To our knowledge, this is the first synthetic receptor for cGMP, which also demonstrates a high preference to bind guanine-rich sequences accomplished by a strong fluorescence quenching. The receptor conformation is very sensitive to the guest structure in an aqueous solution, thus modeling the adaptive behavior of proteins. The study of synthetic
Cytosine‐Functionalized Macrocyclic Receptor for Nucleotides: Combining Three Recognition Motifs
作者:Boris S. Morozov、Alexander S. Oshchepkov、Dan Xu、Evgeny A. Kataev
DOI:10.1002/ejoc.202300895
日期:2024.1.2
The macrocyclicreceptor for nucleotides that combines motifs for electrostatic, π-π stacking, and hydrogenbondinginteractions was designed and investigated. The presence of cytosine in the structure of the receptor increases the affinity and selectivity for guanine-containing nucleotides and cyclic di-GMP.