在最近的一系列论文中,Miller和他的同事们能够证明基于His(π-Me)的末端保护肽是不对称酰基转移反应的有效催化剂,可用于醇的动力学拆分。在一种支持结构的溶剂中,活性最高的化合物之一,即一个含Aib的四肽,被折叠成一个分子内双氢键结合的β-发夹基序,并带有II'型β-转角构象。在这项工作中,我们已经通过检查一组类似物和较短序列(二肽酰胺)的扩大了米勒四肽的研究,其特征在于,通过手性Ç α -tetrasubstitutedα氨基发散膨松性和光学配置的酸。溶液中的肽合成,通过FT-IR吸收和1进行构象分析还进行了1 H NMR技术和催化活性的筛选。我们的结果证实了β-发夹3D结构与肽的催化活性之间的密切关系。已经发现选择性比米勒化合物略高的四肽类似物。但是,末端保护的,工业上更具吸引力的二肽酰胺效果差。
Engineering the Structure of an N-Terminal β-Turn To Maximize Screw-Sense Preference in Achiral Helical Peptide Chains
作者:Matteo De Poli、Liam Byrne、Robert A. Brown、Jordi Solà、Alejandro Castellanos、Thomas Boddaert、Romina Wechsel、Jonathan D. Beadle、Jonathan Clayden
DOI:10.1021/jo500714b
日期:2014.5.16
preference are induced by bulky chiral tertiary amino acids carrying amide protecting groups or by chiral quaternary amino acids carrying carbamate protecting groups. Tertiary l-amino acids at the N-terminus of the oligomer induce a left-handed screwsense, while quaternary l-amino acids induce a right-handed screwsense. A screw-sense preference may also be induced from the second position of the chain
[EN] INHIBITORS OF P38 MAP KINASE<br/>[FR] INHIBITEURS DE LA P38 MAP KINASE
申请人:CHROMA THERAPEUTICS LTD
公开号:WO2009106844A1
公开(公告)日:2009-09-03
Compounds of formula (I) are p38 MAP kinase inhibitors useful for the treatment of autoimmune and inflammatory diseases: wherein: G is -N= or -CH=; D is an optionally substituted divalent mono- or bi-cyclic aryl or heteroaryl radical having 5 - 13 ring members; R6 is hydrogen or optionally substituted CrC3 alkyl; P represents hydrogen and U represents a radical of formula (IA); or U represents hydrogen and P represents a radical of formula (IA); wherein A represents an optionally substituted divalent mono- or bicyclic carbocyclic or heterocyclic radical having 5 - 13 ring members; z is O or 1; -X1-L1-Y- is a linker radical or bond; R1 is a carboxylic acid group (-COOH), or an ester group which is hydrolysable by one or more intracellular esterase enzymes to a carboxylic acid group; and R2 and R3 are as defined in the claims.
Induction of Unexpected Left-Handed Helicity by an N-Terminal L-Amino Acid in an Otherwise Achiral Peptide Chain
作者:Robert A. Brown、Tommaso Marcelli、Matteo De Poli、Jordi Solà、Jonathan Clayden
DOI:10.1002/anie.201107583
日期:2012.2.6
Peptide helices containing L‐amino acids are typically right‐handed. Exceptions are peptide helices containing the achiral amino acids 2‐aminoisobutyric acid and glycine with a single chiral amino acid at the N terminus. These helices are left‐handed when the N‐terminal residue is a common tertiary proteinogenic amino acid, such as L‐valine (see picture, left), but right‐handed when the N‐terminal
Peptaibolin: synthesis, 3D-structure, and membrane modifying properties of the natural antibiotic and selected analogues
作者:Marco Crisma、Alessandra Barazza、Fernando Formaggio、Bernard Kaptein、Quirinus B Broxterman、Johan Kamphuis、Claudio Toniolo
DOI:10.1016/s0040-4020(01)00124-7
日期:2001.4
tetrapeptide antibiotic peptaibolin and selected analogues with replacements at the N- and C-terminal groups and the Cα-tetrasubstituted α-amino acids. The preferred conformation of all of the peptides was assessed in solution by using FT-IR absorption and 1H NMR techniques. Results of the X-ray diffraction analyses of peptaibolin itself and three analogues are also presented. Permeability measurements
我们通过溶液方法合成,并用在N-替换和C-末端基团以及C完全表征的天然存在的,四肽抗生素peptaibolin和选定的类似物的α -tetrasubstitutedα氨基酸。通过使用FT-IR吸收和1 H NMR技术在溶液中评估所有肽的优选构象。还提供了肽肽素本身和三种类似物的X射线衍射分析结果。这种多匝形成,非常短的肽的渗透性测量结果表明,肽环素没有膜活性,因为脂酰N端封闭基团是必不可少的。
Total Synthesis, Characterization, and Conformational Analysis of the Naturally Occurring Hexadecapeptide Integramideâ A and a Diastereomer
作者:Marta Deâ Zotti、Francesca Damato、Fernando Formaggio、Marco Crisma、Elisabetta Schievano、Stefano Mammi、Bernard Kaptein、Quirinusâ B. Broxterman、Peterâ J. Felock、Dariaâ J. Hazuda、Sheoâ B. Singh、Jochen Kirschbaum、Hans Brückner、Claudio Toniolo
DOI:10.1002/chem.200900945
日期:2010.1.4
L‐Iva14‐D‐Iva15. Herein, we describe the syntheses of the natural compound and its D‐Iva14‐L‐Iva15 diastereomer, and the results of their chromatographic/mass spectrometric analyses. We present the conformationalanalysis of the two compounds and some of their synthetic intermediates of different main‐chain length in the crystal state (by X‐ray diffraction) and in solvents of different polarities (using circular