5-Deazaflavin derivatives as inhibitors of p53 ubiquitination by HDM2
摘要:
Based on previous reports of certain 5-deazaflavin derivatives being capable of activating the tumour suppressor p53 in cancer cells through inhibition of the p53-specific ubiquitin E3 ligase HDM2, we have conducted an structure-activity relationship (SAR) analysis through systematic modification of the 5-deazaflavin template. This analysis shows that HDM2-inhibitory activity depends on a combination of factors. The most active compounds (e. g., 15) contain a trifluoromethyl or chloro substituent at the deazaflavin C9 position and this activity depends to a large extent on the presence of at least one additional halogen or methyl substituent of the phenyl group at N10. Our SAR results, in combination with the HDM2 RING domain receptor recognition model we present, form the basis for the design of drug-like and potent activators of p53 for potential cancer therapy. (C) 2013 The Authors. Published by Elsevier Ltd. All rights reserved.
Steady-state and time-resolved spectra were used to describe the singlet and triplet states of 8-methyl-5-deazaalloxazine (8-Me-5-DAll), 9-methyl-5-deazaalloxazine (9-Me-5-DAll) and 10-ethyl-5-deaza-isoalloxazine (10-Et-5-DIAll). Solvatochromic properties were described using different polarity scales, including Δf and the four-parameter scale proposed by Catalán. The results indicate that the Catalán scale shows a strong influence of solvent acidity (hydrogen-bond donating ability) on the emission properties of 8-Me-5-DAll and 9-Me-5-DAll. These results indicate the importance of intermolecular solute-solvent hydrogen-bonding interactions in the excited state of these compounds. Contrary to deazaalloxazines, solvent acidity affects the absorption spectra of 10-Et-5-DIAll. Fluorescence lifetimes and quantum yields and also transient absorption spectra were determined for all of the compounds studied. Electronic structure and S 0 -S i , S 0 -T i , T 1 -T i transitions energies and oscillator strengths were calculated using the TD-DFT methods. Theoretical calculations were compared to experimental data.
利用稳态光谱和时间分辨光谱描述了 8-甲基-5-脱氮哒嗪(8-Me-5-DAll)、9-甲基-5-脱氮哒嗪(9-Me-5-DAll)和 10-乙基-5-脱氮异哒嗪(10-Et-5-DIAll)的单线态和三线态。采用不同的极性标度(包括 Δf 和卡塔兰提出的四参数标度)对溶变色特性进行了描述。结果表明,Catalán 标度显示了溶剂酸性(氢键捐赠能力)对 8-Me-5-DAll 和 9-Me-5-DAll 发射特性的强烈影响。这些结果表明了分子间溶质-溶剂氢键相互作用在这些化合物激发态中的重要性。与去氮氮氧化物相反,溶剂的酸性会影响 10-Et-5-DIAll 的吸收光谱。研究人员测定了所有化合物的荧光寿命和量子产率以及瞬态吸收光谱。使用 TD-DFT 方法计算了电子结构和 S 0 -S i 、S 0 -T i 、T 1 -T i 转变的能量和振荡器强度。理论计算结果与实验数据进行了比较。
Synthesis, biological active molecular design, and molecular docking study of novel deazaflavin–cholestane hybrid compounds
作者:Ajaya R. Shrestha、Takashi Shindo、Noriyuki Ashida、Tomohisa Nagamatsu
DOI:10.1016/j.bmc.2008.07.089
日期:2008.9
Novel deazaflavin-cholestane hybrid compounds, 3',8'-disubstituted-5'-deazacholest-2,4-dieno[2,3g] pteridine-2',4'(3'H, 8'H)-diones, have been synthesized by condensation reaction between 6-(monosubstituted amino)-pyrimidin-2,4(1H,3H)-diones and 2-hydroxymethylenecholest-4-en-3-one in presence of p-toluenesulfonic acid monohydrate and diphenyl ether. The antitumor activities against human tumor cell lines (CCRF-HSB-2 and KB cells) have been investigated in vitro, and many of these compounds showed promising antitumor activities. Furthermore, molecular docking study using LigandFit within the software package Discovery Studio 1.7 was done for lead optimization of these compounds as potential PTK inhibitors. In general, all of the synthesized steroid-hybrid compounds showed good binding affinities into PTK (PDB code: 1t46). (C) 2008 Elsevier Ltd. All rights reserved.
5-Deazaflavin derivatives as inhibitors of p53 ubiquitination by HDM2
作者:Michael P. Dickens、Patricia Roxburgh、Andreas Hock、Mokdad Mezna、Barrie Kellam、Karen H. Vousden、Peter M. Fischer
DOI:10.1016/j.bmc.2013.09.038
日期:2013.11
Based on previous reports of certain 5-deazaflavin derivatives being capable of activating the tumour suppressor p53 in cancer cells through inhibition of the p53-specific ubiquitin E3 ligase HDM2, we have conducted an structure-activity relationship (SAR) analysis through systematic modification of the 5-deazaflavin template. This analysis shows that HDM2-inhibitory activity depends on a combination of factors. The most active compounds (e. g., 15) contain a trifluoromethyl or chloro substituent at the deazaflavin C9 position and this activity depends to a large extent on the presence of at least one additional halogen or methyl substituent of the phenyl group at N10. Our SAR results, in combination with the HDM2 RING domain receptor recognition model we present, form the basis for the design of drug-like and potent activators of p53 for potential cancer therapy. (C) 2013 The Authors. Published by Elsevier Ltd. All rights reserved.
Photocatalytic Oxidative [2+2] Cycloelimination Reactions with Flavinium Salts: Mechanistic Study and Influence of the Catalyst Structure
作者:Tomáš Hartman、Martina Reisnerová、Josef Chudoba、Eva Svobodová、Nataliya Archipowa、Roger Jan Kutta、Radek Cibulka
DOI:10.1002/cplu.202000767
日期:2021.3
and investigated their application in light‐dependent oxidative cycloelimination of cyclobutanes. Detailed mechanistic investigations with a coumarin dimer as a model substrate reveal that the reaction preferentially occurs via the triplet‐born radical pair after electron transfer from the substrate to the triplet state of an alloxazinium salt. The very photostable 7,8‐dimethoxy derivative is a superior