Mucochloric (MCA) and mucobromic acid (MBA)--bacterial mutagens and water disinfection byproducts--were reacted with adenosine, cytidine, and guanosine in N,N-dimethylformamide (DMF). In the MCA reaction with adenosine and cytidine and in the MBA reaction with adenosine one major product was formed. In the reactions of MBA with cytidine and in the reactions of MCA and MBA with guanosine only trace
在N,N-二甲基甲酰胺(DMF)中,将细菌性诱变剂和水消毒副产物的粘氯(MCA)和粘溴酸(MBA)与腺苷,胞苷和鸟嘌呤反应。在与腺苷和胞苷的MCA反应中以及在与腺苷的MBA反应中,形成了一种主要产物。在MBA与胞嘧啶的反应中,在MCA和MBA与鸟苷的反应中,仅能检测到痕量的产物,并且没有进一步表征。通过在十八烷基硅烷柱上的制备色谱分离腺苷和胞苷反应的产物,并通过紫外吸收,1 H和13 C NMR光谱以及质谱对结构进行表征。产物鉴定为3-(N6-腺苷基)-2-氯-2-丙烯醛(MClA),3-(N6-腺苷基)-2-溴-2-丙醛(MBrA),和3-(N4-胞嘧啶基)-2-氯-2-丙烯醛(MClC)。MClA,MBrA和MClC的产率分别为19、4和7 mol%。这些卤代丙烯醛衍生物也是在水溶液中于pH 7.4和37摄氏度下以低收率(约5 x 10(-3)%)收率形成的。通过使13C-3标记的MC
A New One‐Pot Fluorescence Derivatization Strategy for Highly Sensitive MicroRNA Analysis
作者:Li Pan、Huaisheng Zhang、Jingjin Zhao、Ifedayo Victor Ogungbe、Shulin Zhao、Yi‐Ming Liu
DOI:10.1002/chem.201905639
日期:2020.5.4
of miRNAs may lead to a range of human pathologies. Therefore, analysis of miRNAs is valuable for disease diagnostics. In this work, a novel one-pot fluorescence derivatization strategy was developed for miRNA analysis. The mechanism of the derivatization reaction was explored by using instrumental methods, including liquid chromatography, fluorescence spectroscopy, and mass spectrometry. Highly fluorescent
The nucleoside transport proteins, NupC and NupG, from Escherichia coli: specific structural motifs necessary for the binding of ligands
作者:Simon G. Patching、Stephen A. Baldwin、Alexander D. Baldwin、James D. Young、Maurice P. Gallagher、Peter J. F. Henderson、Richard B. Herbert
DOI:10.1039/b414739a
日期:——
unrelated transporters showed similar but distinct patterns of inhibition, revealing differing selectivities for the different nucleosides and their analogues. Binding of nucleosides to NupG required the presence of hydroxyl groups at each of the C-3' and C-5' positions of ribose, while binding to NupC required only the C-3' hydroxyl substituent. The greater importance of the ribose moiety for binding to
2-Deuterated adenosine (5) was conveniently prepared from adenosine (1) by applying the ring-fission and reclosure methodology of 1, N6-ethenoadenosine (2) and a new oxidative unmasking method of the etheno moiety.