nitroxide probe
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2021 ◽  
Vol 163 ◽  
pp. 297-305
Author(s):  
Risa Azuma ◽  
Toshihide Yamasaki ◽  
Kohei Sano ◽  
Masayuki Munekane ◽  
Yuta Matsuoka ◽  
...  

2021 ◽  
Author(s):  
Kosho Yamauchi ◽  
Yuta Matsuoka ◽  
Masatomo Takahashi ◽  
Yoshihiro Izumi ◽  
Hideto Naka ◽  
...  

Oxidative damage of DNA is associated with aging and disease development. Although nucleoside-derived radicals play an important role in DNA oxidation, their analysis methods are limited. Herein, we propose a...


Molecules ◽  
2020 ◽  
Vol 25 (21) ◽  
pp. 5187
Author(s):  
Yamanappa Hunashal ◽  
Cristina Cantarutti ◽  
Sofia Giorgetti ◽  
Loredana Marchese ◽  
Federico Fogolari ◽  
...  

Background: The interaction between proteins and nanoparticles is a very relevant subject because of the potential applications in medicine and material science in general. Further interest derives from the amyloidogenic character of the considered protein, β2-microglobulin (β2m), which may be regarded as a paradigmatic system for possible therapeutic strategies. Previous evidence showed in fact that gold nanoparticles (AuNPs) are able to inhibit β2m fibril formation in vitro. Methods: NMR (Nuclear Magnetic Resonance) and ESR (Electron Spin Resonance) spectroscopy are employed to characterize the paramagnetic perturbation of the extrinsic nitroxide probe Tempol on β2m in the absence and presence of AuNPs to determine the surface accessibility properties and the occurrence of chemical or conformational exchange, based on measurements conducted under magnetization equilibrium and non-equilibrium conditions. Results: The nitroxide perturbation analysis successfully identifies the protein regions where protein-protein or protein-AuNPs interactions hinder accessibility or/and establish exchange contacts. These information give interesting clues to recognize the fibrillation interface of β2m and hypothesize a mechanism for AuNPs fibrillogenesis inhibition. Conclusions: The presented approach can be advantageously applied to the characterization of the interface in protein-protein and protein-nanoparticles interactions.


Antibiotics ◽  
2019 ◽  
Vol 8 (1) ◽  
pp. 19 ◽  
Author(s):  
Anthony Verderosa ◽  
Rabeb Dhouib ◽  
Kathryn Fairfull-Smith ◽  
Makrina Totsika

Fluorescent probes are widely used for imaging and measuring dynamic processes in living cells. Fluorescent antibiotics are valuable tools for examining antibiotic–bacterial interactions, antimicrobial resistance and elucidating antibiotic modes of action. Profluorescent nitroxides are ‘switch on’ fluorescent probes used to visualize and monitor intracellular free radical and redox processes in biological systems. Here, we have combined the inherent fluorescent and antimicrobial properties of the fluoroquinolone core structure with the fluorescence suppression capabilities of a nitroxide to produce the first example of a profluorescent fluoroquinolone-nitroxide probe. Fluoroquinolone-nitroxide (FN) 14 exhibited significant suppression of fluorescence (>36-fold), which could be restored via radical trapping (fluoroquinolone-methoxyamine 17) or reduction to the corresponding hydroxylamine 20. Importantly, FN 14 was able to enter both Gram-positive and Gram-negative bacterial cells, emitted a measurable fluorescence signal upon cell entry (switch on), and retained antibacterial activity. In conclusion, profluorescent nitroxide antibiotics offer a new powerful tool for visualizing antibiotic–bacterial interactions and researching intracellular chemical processes.


RSC Advances ◽  
2016 ◽  
Vol 6 (65) ◽  
pp. 60907-60915 ◽  
Author(s):  
Yuta Matsuoka ◽  
Kei Ohkubo ◽  
Toshihide Yamasaki ◽  
Mayumi Yamato ◽  
Hiroshi Ohtabu ◽  
...  

15-((9-(Ethylimino)-10-methyl-9Hbenzo[a]phenoxazin-5-yl)amino)-3,11-dioxa-7-azadispiro[5.1.58.36]hexadecan-7-yloxyl, (Nile-DiPy) has been synthesized and examined as an off–on profluorescent nitroxide probe for measuring ascorbic acid in plasma.


RSC Advances ◽  
2015 ◽  
Vol 5 (78) ◽  
pp. 63655-63661 ◽  
Author(s):  
Hui Yu ◽  
Linying Cao ◽  
Feifei Li ◽  
Qingfeng Wu ◽  
Qiang Li ◽  
...  

A rhodamine-nitroxide probe (R-NO˙) was introduced to probe glutathionyl radicals (GS˙) with high sensitivity and selectivity.


2014 ◽  
Vol 42 (18) ◽  
pp. e140-e140 ◽  
Author(s):  
Yuan Ding ◽  
Xiaojun Zhang ◽  
Kenneth W. Tham ◽  
Peter Z. Qin
Keyword(s):  

2014 ◽  
Vol 593 ◽  
pp. 89-92 ◽  
Author(s):  
Carolina Aliaga ◽  
Patricio Fuentealba ◽  
Marcos Caroli Rezende ◽  
Carlos Cárdenas
Keyword(s):  

2014 ◽  
Vol 86 (2) ◽  
pp. 1045-1052 ◽  
Author(s):  
Alexandre Samouilov ◽  
Olga V. Efimova ◽  
Andrey A. Bobko ◽  
Ziqi Sun ◽  
Sergey Petryakov ◽  
...  

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