Liquid chromatography/electrospray ionisation mass spectrometric tracking of 4-hydroxy-2(<i>E</i>)-nonenal biotransformations by mouse colon epithelial cells using [1,2-<sup>13</sup>C<sub>2</sub>]-4-hydroxy-2(<i>E</i>)-nonenal as stable isotope tracer
作者:I. Jouanin、M. Baradat、M. Gieules、S. Taché、F. H. F. Pierre、F. Guéraud、L. Debrauwer
DOI:10.1002/rcm.5033
日期:2011.10.15
4-Hydroxy-2(E)-nonenal (HNE), a product of lipid peroxidation, has been extensively studied in several areas, including metabolism with radio-isotopes and quantification in various matrices with deuterium-labelled HNE as standard. The aim of this work was to evaluate the relevance of (13)C-labelled HNE in biotransformation studies to discriminate metabolites from endogens by liquid chromatography/electrospray
[R′CH(OH)CHCHCO2R], which are ubiquitous structures in biologically active natural products and useful building blocks for organicsynthesis of chiral compounds. From the optically pure (R)-2-(2-benzothiazolylsulfinyl)acetates (>99% ee) prepared by the enzymatic kinetic resolution of (±)-2-(2-benzothiazolylsulfinyl)acetates, opticallyactive 4-hydroxyalk-2-enoates (up to 91% ee) have been obtained in good
Preorganized Ligand Arrays Based on Spirotetrahydrofuranyl Motifs. Synthesis of the Stereoisomeric 1,8,14-Trioxatrispiro[4.1.4.1.4.1]octadecanes and the Contrasting Conformational Features and Ionic Binding Capacities of These Belted Ionophores
作者:Leo A. Paquette、Jinsung Tae、Eugene R. Hickey、William E. Trego、Robin D. Rogers
DOI:10.1021/jo001430a
日期:2000.12.1
and Na(+) ions, as well as to CH(3)NH(3)(+). Whereas the 3eq conformation is populated in the solid state and in solution, complex formation occurs readily. (13)C NMRstudies have defined slow exchange limits as the 2:1 sandwich complex with lithiumion is initially formed and transformed progressively into a 1:1 species upon the addition of more LiClO(4). Only the 2:1complex with sodium ion is formed
A Generalizable Platform for Interrogating Target- and Signal-Specific Consequences of Electrophilic Modifications in Redox-Dependent Cell Signaling
作者:Hong-Yu Lin、Joseph A. Haegele、Michael T. Disare、Qishan Lin、Yimon Aye
DOI:10.1021/ja5132648
日期:2015.5.20
Despite the known propensity of small-molecule electrophiles to react with numerous cysteine-active proteins, biological actions of individual signal inducers have emerged to be chemotype-specific. To pinpoint and quantify the impacts of modifying one target out of the whole proteome, we develop a target-protein-personalized "electrophile toolbox" with which specific intracellular targets can be selectively modified at a precise time by specific reactive signals. This general methodology, T-REX (targetable reactive electrophiles and oxidants), is established by (1),constructing a platform that can deliver a range of electronic and sterically different bioactive lipid-derived signaling electrophiles to specific proteins in cells; (2) probing the kinetics of targeted delivery concept, which revealed that targeting efficiency in cells is largely driven by initial on-rate of alkylation; and (3) evaluating the consequences of protein-target- and small-molecule-signal-specific modifications on the strength of downstream signaling These data Show that T-REX allows quantitative interrogations into the extent to which the Nrf2 transcription factor-dependent antioxidant response element (ARE) signaling is activated by selective electrophilic modifications on Keapl protein, one of several redox-sensitive regulators of the Nrf2-ARE axis. The results document Keapl as a promiscuous electrophile-responsive sensor able to respond with similar efficiencies to discrete electrophilic signals, promoting comparable strength of Nrf2-ARE induction. T-REX is also able to elicit cell activation in cases in which whole-cell electrophile flooding fails to stimulate ARE induction prior to causing cytotoxicity. The platform presents a previously unavailable opportunity to elucidate the functional consequences of small-inolecule-signal- and protein-target-specific electrophilic modifications in an otherwise unaffected cellular background.
Coppola,G.M.; Hardtmann,G.E., Journal of Heterocyclic Chemistry, 1979, vol. 16, p. 1605 - 1610