Impact of the Proline Residue on Ligand Binding of Neurotensin Receptor 2 (NTS2)-Selective Peptide-Peptoid Hybrids
作者:Cornelia Held、Harald Hübner、Ralf Kling、Yvonne A. Nagel、Helma Wennemers、Peter Gmeiner
DOI:10.1002/cmdc.201300054
日期:2013.5
investigate the binding mode and structure–activity relationships (SARs) of selective neurotensinreceptor2 (NTS2) ligands, novel peptide–peptoidhybrids that simulate the function of the endogenous ligand were developed. Starting from our recently described NTS2ligands of type 1, structural variants of type 2 and the metabolically stable analogues 3 a,b were developed. Replacement of the proline unit by
为了研究选择性神经降压素受体2(NTS2)配体的结合模式和结构-活性关系(SAR),开发了模拟内源性配体功能的新型肽-类肽杂化物。从我们最近描述的1型NTS2配体开始,开发了2型的结构变异体和代谢稳定的类似物3a,b。脯氨酸单元被一组结构替代物替代,并对相应分子探针的NTS2亲和力和选择性进行了评估,表明与结合至亚型NTS1的NT(8-13)衍生物所描述的SAR相似。肽-类肽杂种2 d,3 a,b与NTS1相比,具有显着的NTS2结合亲和力(K i = 8.1–16 n M)和2400-8600倍的选择性。噻唑烷衍生物3b在血清降解试验中显示出超过32小时的代谢稳定性。在肌醇磷酸盐积累测定中,神经降压素模拟物3a和3b表现出的组成性活性抑制作用是NT(8-13)活性的1.7-2.0倍。氟化衍生物3a可以提供诱人的机会,通过19 F磁共振成像检测NTS2 。
Synthesis of Gonadotropin-Releasing Hormone III Analogs. Structure−Antitumor Activity Relationships
作者:Imre Mezö、Sándor Lovas、István Pályi、Borbála Vincze、Adrien Kálnay、Gizella Turi、Zsolt Vadász、János Seprödi、Miklós Idei、Géza Tóth、Éva Gulyás、Ferenc Ötvös、Mariann Mák、Judit E. Horváth、István Teplán、Richard F. Murphy
DOI:10.1021/jm9700981
日期:1997.10.1
observation that the activity of gonadotropin-releasing hormone III (GnRH-III) in the suppression of growth of MDA-MB-231 and MCF-7 breast cancer cells surpasses that of GnRH and other analogs thereof, analogs of GnRH-III were synthesized to investigate the structural basis for the improved antitumor activity. Compounds synthesized include analogs with changes in the central sequence in which GnRH-III differs
clustering of proteins, we predicted regio- and stereoselectivity in the hydroxylation reaction and validated this hypothesis experimentally. Two novel byproducts in the reactions with enzymes from Bacillus cereus and Streptomyces sp. were isolated, and the structures were determined to be a 3,4-epoxide and a 3,4-diol, respectively. The mechanism for the formation of the epoxide was investigated by performing
Does Cysteine Rule (CysR) Complete the CendR Principle? Increase in Affinity of Peptide Ligands for NRP-1 Through the Presence of N-Terminal Cysteine
作者:Anna K. Puszko、Piotr Sosnowski、Françoise Raynaud、Olivier Hermine、Gérard Hopfgartner、Yves Lepelletier、Aleksandra Misicka
DOI:10.3390/biom10030448
日期:——
structure-activity relationship of branched H-Lys(hArg)-Dab-Dhp-Arg-OH sequence analogues, modified with Cys-Asp or Cys at N-terminal amino acids (Lys, hArg), in VEGF-A165/Neuropilin-1 complex inhibition is presented. The addition of Cys residue led to a 100-fold decrease in the IC50 value, compared to the parent peptide. The change occurred regardless of coupling Cys to the free N-terminal amino group present in the
Variation of the intercalating proline in artificial peptides mimicking the DNA binding and bending IHF protein
作者:S. Scholz、E. K. Liebler、B. Eickmann、H.-J. Fritz、U. Diederichsen
DOI:10.1007/s00726-011-1073-1
日期:2012.7
4-tetrahydroisoquinoline-3-carboxylic acid), aromaticity (phenylalanine), conformation of the five-membered ring [(4R)-fluoroproline, (4S)-fluoroproline, 3,4-dehydroproline], and the peptide backbone conformation (α-methylproline) on binding dsDNA and bending the double strand. Binding and bending studies were carried out by fluorescence resonance energy transfer experiments and gel electrophoresis using
整合宿主因子 (IHF) 是一种蛋白质,其序列特异性诱导双链 DNA 弯曲超过 160°。基于 IHF 作为先导结构,引入了一种肽模拟物,类似于通过赖氨酸树枝状聚合物带正电的蛋白质体和由环肽构成的小沟识别环。位于识别环尖端附近的脯氨酸插入碱基对平面之间。为了评估侧链残基对大小(1,2,3,4-四氢异喹啉-3-羧酸)、芳香性(苯丙氨酸)、五元环构象 [(4R )-氟脯氨酸、(4S)-氟脯氨酸、3,4-脱氢脯氨酸],以及结合 dsDNA 和弯曲双链的肽主链构象(α-甲基脯氨酸)。结合和弯曲研究通过荧光共振能量转移实验和凝胶电泳使用通过 PCR 制备的 DNA 序列进行,IHF 结合位点位于中心或末端位置。虽然芳香族残基和 α-甲基脯氨酸不能作为脯氨酸替代品,但 (4S)-氟脯氨酸和 3,4-脱氢脯氨酸的结合提供了增强的结合。