Rigid peptide backbones and backbone-to-side chain H-bonds permit the design of α-nucleopeptides with known 3D-structure; thymineâthymine base pairing is also observed.
Linear oligopeptides. Part 147. Chemical and crystallographic study of the reaction between benzyloxycarbonyl chloride and α-aminoisobutyric acid
作者:Giovanni Valle、Fernando Formaggio、Marco Crisma、Gian Maria Bonora、Claudio Toniolo、Alfonso Bavoso、Ettore Benedetti、Benedetto Di Blasio、Vincenzo Pavone、Carlo Pedone
DOI:10.1039/p29860001371
日期:——
From the reaction mixture of benzyloxycarbonylchloride and α-aminoisobutyricacid three crystalline compounds were isolated and characterized by chromatographic and spectroscopic techniques and X-ray diffraction. Two of them are polymorphic forms of the N-protected amino acid, which differ in the orientation of the phenyl ring relative to the urethane moiety and in the packing modes of the molecules
Effect of <i>N</i><sup>α</sup>-Acyl Chain Length on the Membrane-Modifying Properties of Synthetic Analogs of the Lipopeptaibol Trichogin GA IV
作者:C. Toniolo、M. Crisma、F. Formaggio、C. Peggion、V. Monaco、C. Goulard、S. Rebuffat、B. Bodo
DOI:10.1021/ja954081o
日期:1996.1.1
11-residue lipopeptaibol blocked at the N-terminus by an n-octanoyl group and at the C-terminus by a 1,2-amino alcohol (l-leucinol), extracted from the fungus Trichoderma longibrachiatum, exhibits remarkable membrane-modifying properties. We have synthesized trichogin GA IV and several [l-Leu-OMe11] analogs carrying at the N-terminus an acyl chain of variable length (C2−C8, C10, C12, C14, C16, C18). A succinoylated
Trichogin GA IV 是一种在 N 端被正辛酰基封闭,在 C 端被 1,2-氨基醇(l-亮氨醇)封闭的 11 个残基脂肽醇,从真菌 Trichoderma longibrachiatum 中提取,表现出显着的效果膜改性特性。我们已经合成了 Trichogin GA IV 和几种 [l-Leu-OMe11] 类似物,在 N 端带有可变长度的酰基链(C2-C8、C10、C12、C14、C16、C18)。还制备了琥珀酰化的头对头二聚体。通过 FTIR 吸收、CD 和 NMR 进行的构象分析表明,天然 lipopeptaibol 的右手螺旋结构基本上保留在其所有类似物中。渗透性测量表明,Nα 阻断脂肪酰基部分中至少有六个碳原子是显着的膜改性特性的开始所必需的。此外,头对头二聚体非常活跃。讨论了 Trichogin GA IV 的膜通透性机制的可能模型。
Replacement of Ala by Aib improves structuration and biological stability in thymine-based α-nucleopeptides
Three thymine-based nucleo-heptapeptides, each containing two nucleo-amino acids and zero, one or four Aib residues, respectively, have been synthesized. A single Aib residue is enough to promote the adoption of a helical structure in our nucleopeptides and to increase significantly their resistance towards enzymatic degradation. The insertion of four Aib residues, out of seven residues in the sequence, affords a rigid, 310-helical nucleopeptide that is substantially unaffected by serum enzymes and is not cytotoxic.
Peptides from chiral Cαα-disubstituted glycines. On the helical screw sense of isovaline peptides
作者:M. Crisma、G. Valle、M. Pantano、F. Formaggio、G. M. Bonora、C. Toniolo、J. Kamphuis
DOI:10.1002/recl.19951140706
日期:——
and in the crystal state by X-ray diffraction. All these peptides are folded in a 310-helix structure, irrespective of the experimental conditions used in the conformational analysis. In the crystal state the screwsense preference of the helical structure that is formed seems to be governed by the position of the single Iva residue in the peptide main chain, the ethyl side-chain disposition, and the