Design, Synthesis, and Modeling of Novel Cyclic Thrombin Receptor-Derived Peptide Analogues of the Ser<sup>42</sup>-Phe-Leu-Leu-Arg<sup>46</sup> Motif Sequence with Fixed Conformations of Pharmacophoric Groups: Importance of a Phe/Arg/NH<sub>2</sub> Cluster for Receptor Activation and Implications in the Design of Nonpeptide Thrombin Receptor Mimetics
作者:Kostas Alexopoulos、Dimitris Panagiotopoulos、Thomas Mavromoustakos、Panagiotis Fatseas、Maria Christina Paredes-Carbajal、Dieter Mascher、Stefan Mihailescu、John Matsoukas
DOI:10.1021/jm0001525
日期:2001.2.1
The novel cyclic analogues cyclo(Phe-Leu-Leu-Arg-epsilonLys-Dap) (1) and cyclo(D-Phe-Leu-Leu-Arg-epsilonLys-Dap) (2), which differ only in the absolute conformation of Phe, have been designed and synthesized based upon the minimal peptide sequence Phe-Leu-Leu-Arg which has been found to exhibit biological activity for the thrombin receptor. Compound 1, in which all amino acids have the L-configuration
新颖的环状类似物环(Phe-Leu-Leu-Arg-epsilonLys-Dap)(1)和环(D-Phe-Leu-Leu-Arg-epsilonLys-Dap)(2),仅在根据最小的肽序列Phe-Leu-Leu-Arg设计和合成了Phe,该序列已发现对凝血酶受体具有生物活性。与其中Phe残基为D-构型的化合物2相比,其中所有氨基酸均具有L-构型的化合物1在大鼠主动脉松弛和大鼠纵向肌肉生物测定中表现出更高的活性。这归因于化合物1中Phe和Arg的空间接近性,而这在其非对映体化合物2中不存在,如NMR研究和计算分析的结合所描绘的。结构活性研究(SAR)表明,Phe和Arg侧链与伯氨基一起形成了一个主动识别基序,环状肽中存在另一个伯氨基会增强该识别基序。我们建议可比的环状构象可能是线性TRAP与凝血酶受体相互作用的原因。通过合成四种活性非肽凝血酶受体模拟物测试了该命题的有效性。发现了(S)-N-