Azido Acids in a Novel Method of Solid-Phase Peptide Synthesis.
作者:Morten Meldal*、Maria A Juliano、Anita M Jansson
DOI:10.1016/s0040-4039(97)00393-6
日期:1997.4
in a novel method of solid-phasesynthesis. The azido acids were transformed into the highly activated acid chlorides and used synthesis of extremely hindered peptides containing up to four successive diphenyl glycine or Aib residues. By reaction of the genetically encoded amino acids with TfN3 and then SOCl2 they were transformed into α-azido acid chlorides used in solid-phasepeptidesynthesis without
Quantifying End-to-End Conformational Communication of Chirality through an Achiral Peptide Chain
作者:Jonathan Clayden、Alejandro Castellanos、Jordi Solà、Gareth A. Morris
DOI:10.1002/anie.200901892
日期:2009.7.27
Successful communication: Two diastereotopic protons more than 60 bonds from the nearest chiral center appear as an AB system, showing that the intervening structure is a well‐ordered helix. Decay of anisochronicity quantifies the linear persistence of a helix of achiral amino acids: as little as 3.5 % of the chiral influence is lost with each additional achiral residue.
cationic cap. The efrapeptins C–G and three analogues of efrapeptinC were synthesized using α‐azido carboxylic acids as masked aminoacid derivatives. All compounds display inhibitory activity toward F1‐ATPase. The conformation in solution of the peptides was investigated with electronic CD spectroscopy, FT‐IR spectroscopy, and VCD spectroscopy. All efrapeptins and most efrapeptin analogues were shown
Diastereotopic fluorine substituents as 19F NMR probes of screw-sense preference in helical foldamers
作者:Sarah J. Pike、Matteo De Poli、Wojciech Zawodny、James Raftery、Simon J. Webb、Jonathan Clayden
DOI:10.1039/c3ob40463c
日期:——
Ligating simple amino alcohol or amino ester monomers containing enantiotopic fluorine substituents to the C-terminus of a helical peptide places the fluorine atoms in diastereotopic environments, and gives two distinct and easily identifiable signals in the 19F NMR spectrum. In the case of a dynamically inverting helix built from achiral monomers, the chemical shift separation between the 19F signals provides a simple means of analysing the ratio of screw-sense conformers in the oligomer, in cases where an asymmetric bias leads to a screw-sense preference.
将含有对映体氟取代基的简单氨基醇或氨基酯单体连接到螺旋肽的 C 端,将氟原子置于非对映环境中,并在 19F NMR 光谱中产生两个不同且易于识别的信号。对于由非手性单体构建的动态反转螺旋,19F 信号之间的化学位移分离提供了一种简单的方法,在不对称偏置导致螺旋顺应性偏好的情况下,可以分析低聚物中螺旋顺应性构象的比例。
Length-Dependent Formation of Transmembrane Pores by 3<sub>10</sub>-Helical α-Aminoisobutyric Acid Foldamers
作者:Jennifer E. Jones、Vincent Diemer、Catherine Adam、James Raftery、Rebecca E. Ruscoe、Jason T. Sengel、Mark I. Wallace、Antoine Bader、Scott L. Cockroft、Jonathan Clayden、Simon J. Webb
DOI:10.1021/jacs.5b12057
日期:2016.1.20
α-aminoisobutyric acid (Aib) oligomers was used to create a library of homologous rigid-rod 310-helical foldamers, which have incrementally increasing lengths and functionalizable N- and C-termini. This library was used to probe the inter-relationship of foldamer length, self-association strength, and ionophoric ability, which is poorly understood. Although foldamer self-association in nonpolar chloroform increased