FRET events in fluorescent pentapeptides containing aliphatic triazolo amino acid scaffolds: Role of spacer lengths
摘要:
The FRET efficiencies in donor/acceptor pairs in the two termini of designed fluorescent pentapeptides depend on the flexibility of two arms of triazolyl amino acid scaffolds positioned in the center of the backbones inducing predominant beta-sheet conformations. Flexible N-Terminus of the scaffold in a pentapeptide has led to higher FRET efficiency and makes it different from other peptide with flexible C-terminus.
A simple addition with a large impact: Addition of aromatic amines such as phenanthroline and 4‐DMAP (4‐dimethylaminopyridine) increases copper(I)‐catalyzed azide alkyne cycloaddition (CuAAC) catalytic activity of [CuCl(SIMes)] at a large range of temperatures in such a way that efficient catalysis can safely take place in hydro‐alcoholic solvents (see scheme).
Single-Molecule Tracking of Reagent Diffusion during Chemical Reactions
作者:Zhengfu Zhang、Hongbo Chen、Ming Hu、Dapeng Wang
DOI:10.1021/jacs.2c13172
日期:2023.5.17
diffusion of reagent molecules is inconsistent with what the Stokes–Einstein equation predicts during a chemical reaction. Here, we used single-molecule tracking to observe the diffusion of reactive reagent molecules during click and Diels–Alder (DA) reactions. We found that the diffusion coefficient of the reagents remained unchanged within the experimental uncertainty upon the DA reaction. Yet, diffusion
最近的实验表明,试剂分子的扩散与 Stokes-Einstein 方程在化学反应过程中的预测不一致。在这里,我们使用单分子跟踪来观察反应试剂分子在点击和 Diels-Alder (DA) 反应期间的扩散。我们发现试剂的扩散系数在 DA 反应的实验不确定性范围内保持不变。然而,当试剂浓度和催化剂浓度超过阈值时,在点击反应期间试剂分子的扩散比预期的要快。逐步分析表明,快速扩散情况是由于反应而不是示踪剂与反应本身的参与。