Structural elucidation of Leuprolide and its analogues in solution: insight into their bioactive conformation

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• 作者：Despina K. Laimou ; Maria Katsara ; Minos-Timotheos I. Matsoukas ; Vasso Apostolopoulos ; Anastassios N. Troganis and Theodore V. Tselios
• 关键词：Gonadotropin ; releasing hormone (GnRH) ; Leuprolide ; Nuclear magnetic resonance ; Bioactive conformation ; Molecular dynamics
• 刊名：Amino Acids
• 出版年：2010
• 出版时间：November 2010
• 年：2010
• 卷：39
• 期：5
• 页码：1147-1160
• 全文大小：760.3 KB

文摘

Leuprolide [dLeu6, NHEt10]GnRH, a potent gonadotropin-releasing hormone (GnRH) agonist, is used in a wide variety of hormone-related diseases like cancer and endometriosis. In this report, the conformational behaviour of Leuprolide and its linear synthetic analogues, namely [Tyr5(OMe), dLeu6, Aze9, NHEt10]GnRH (1) and [Tyr5(OMe), dLeu6, NHEt10]GnRH (2) have been studied in DMSO and H₂O solutions by means of 2D nuclear magnetic resonance (NMR) experiments and detailed molecular dynamics (MD) simulations. The aim was to identify the conformational requirements of GnRH analogues for agonistic activity. This approach is of value as no crystallographic data are available for the GnRH receptor (G protein-coupled receptor, GPCR). The NOE data indicate the existence of a β-turn type I in the 2–5 segments of Leuprolide and its linear analogues in the case of using DMSO-d₆ as solvent, whereas a β-turn type II in the 3–6 segments is indicated using D₂O as solvent. The final structures fulfil the conformational requirements that are known, in the literature, to play a significant role in receptor recognition and activation. Finally, the linear analogues (1) and (2) are biologically active when tested against the human breast cancer cell line, MCF-7.