Preparation of Peptide Thioesters through Fmoc-Based Solid-Phase Peptide Synthesis by Using Amino Thioesters
作者:Nicolai Stuhr-Hansen、Theis S. Wilbek、Kristian Strømgaard
DOI:10.1002/ejoc.201300927
日期:2013.8
procedure for the synthesis of peptide alkyl thioesters by 9-fluorenylmethoxycarbonyl (Fmoc) solid-phasepeptidesynthesis was developed. The free C terminus of a fully protected peptide was coupled in solution with the free amino group of an amino thioester. This furnished the fully protected peptidethioester, which was globally deprotected to afford the desired unprotected peptidethioester. The method
Robustness, Entrainment, and Hybridization in Dissipative Molecular Networks, and the Origin of Life
作者:Brian J. Cafferty、Albert S. Y. Wong、Sergey N. Semenov、Lee Belding、Samira Gmür、Wilhelm T. S. Huck、George M. Whitesides
DOI:10.1021/jacs.9b02554
日期:2019.5.22
(rather than stop) these oscillations, when homogeneity in their composition does not. Specifically, multiple reactants in an amide-forming network sustainoscillation when the environment (here, the space velocity) changes, while homogeneous networks-those with fewer reactants-do not. Remarkably, a mixture of two reactants of different structure-neither of which produces oscillations individually-oscillates
Kinetic Selection in the Out‐of‐Equilibrium Autocatalytic Reaction Networks that Produce Macrocyclic Peptides
作者:Xiaoming Miao、Arpita Paikar、Benjamin Lerner、Yael Diskin‐Posner、Guy Shmul、Sergey N. Semenov
DOI:10.1002/anie.202105790
日期:2021.9.6
Autocatalyticreactionnetworks are instrumental for validating scenarios for the emergence of life on Earth and for synthesizing life de novo. Here, we demonstrate that dimeric thioesters of tripeptides with the general structure (Cys-Xxx-Gly-SEt)2 form strongly interconnected autocatalyticreactionnetworks that predominantly generate macrocyclicpeptides up to 69 amino acids long. Some macrocycles
Reactivity of an Unusual Amidase May Explain Colibactin’s DNA Cross-Linking Activity
作者:Yindi Jiang、Alessia Stornetta、Peter W. Villalta、Matthew R. Wilson、Paul D. Boudreau、Li Zha、Silvia Balbo、Emily P. Balskus
DOI:10.1021/jacs.9b02453
日期:2019.7.24
DNA, the molecular basis for cross-link formation is unclear. Here, we report that the colibactin biosynthetic enzyme ClbL is an amide bond-forming enzyme that links aminoketone and β-keto thioester substrates in vitro and in vivo. The substrate specificity of ClbL strongly supports a role for this enzyme in terminating the colibactin NRPS-PKS assembly line and incorporating twoelectrophilic cyclopropane
某些共生细菌和病原细菌会产生大肠杆菌素,这是一种小分子基因毒素,可引起宿主细胞 DNA 链间交联。尽管大肠杆菌素使 DNA 烷基化,但交联形成的分子基础尚不清楚。在这里,我们报道了大肠杆菌素生物合成酶 ClbL 是一种酰胺键形成酶,可在体外和体内连接氨基酮和 β-酮硫酯底物。ClbL 的底物特异性强烈支持该酶在终止大肠杆菌素 NRPS-PKS 组装线并将两个亲电环丙烷弹头合并到最终天然产物支架中的作用。检测到大肠杆菌素衍生的交联 DNA 加合物支持了这一提议的转化。总体而言,这项工作为大肠杆菌素的DNA交联活性提供了生物合成解释,并为进一步研究其化学结构和生物学作用铺平了道路。