Evaluation of lactam-bridged neurotensin analogues adjusting psi(Pro(10)) close to the experimentally derived bioactive conformation of NT(8-13)

摘要

The neurotensin C-terminal hexapeptide, NT(8-13), which has been found to adopt a beta-strand-like conformation while bound to the NT1 receptor, was modified by the introduction of conformational constraints. Synthesis of the four stereoisomeric 4.4-spirolactams 1-4 and subsequent NT1 receptor binding studies showed that the restriction of Psi(Pro(10)) to approximately 130degrees leads to a more than 1000-fold increase of binding affinity for 1 (K-i = 12 nM) when compared to the more flexible analogue [NMeTyr(11)]NT(8-13).