Design and Synthesis of Motilin Antagonists Derived from the [1−4] Fragment of Porcine Motilin
摘要:
A series of cyclic peptides having the general structure H-Phe-c[-N-epsilon-Lys-X-NH-(CH2)(n)-CO-] were designed on the basis of structure-activity relationship studies of motilin. All were motilin antagonists. The cyclic peptides, in which X is a 3-tert-butyl-substituted tyrosine residue (H-Phe-c[-N-epsilon-Lys-Tyr(3-tBu)-betaAla-] (3), H-Phe-c[-N-epsilon-Lys-Tyr(3-tBu)-Gly-] (6), H-Phe-c[-N-epsilon-Lys-Tyr(3-tBu)-Abu-] (7), and H-Phe-c[-N-epsilon-Lys-Tyr(3-tBu)-Ahx-] (8)) showed potent motilin receptor antagonistic activity in the rabbit smooth muscle (pA(2) > 7). The 3-tert-butyl Tyr was found to be the moiety responsible for enhanced binding to the motilin receptor, while the size of the ring had little importance.
Design and Synthesis of Motilin Antagonists Derived from the [1−4] Fragment of Porcine Motilin
摘要:
A series of cyclic peptides having the general structure H-Phe-c[-N-epsilon-Lys-X-NH-(CH2)(n)-CO-] were designed on the basis of structure-activity relationship studies of motilin. All were motilin antagonists. The cyclic peptides, in which X is a 3-tert-butyl-substituted tyrosine residue (H-Phe-c[-N-epsilon-Lys-Tyr(3-tBu)-betaAla-] (3), H-Phe-c[-N-epsilon-Lys-Tyr(3-tBu)-Gly-] (6), H-Phe-c[-N-epsilon-Lys-Tyr(3-tBu)-Abu-] (7), and H-Phe-c[-N-epsilon-Lys-Tyr(3-tBu)-Ahx-] (8)) showed potent motilin receptor antagonistic activity in the rabbit smooth muscle (pA(2) > 7). The 3-tert-butyl Tyr was found to be the moiety responsible for enhanced binding to the motilin receptor, while the size of the ring had little importance.
A series of cyclic peptides having the general structure H-Phe-c[-N-epsilon-Lys-X-NH-(CH2)(n)-CO-] were designed on the basis of structure-activity relationship studies of motilin. All were motilin antagonists. The cyclic peptides, in which X is a 3-tert-butyl-substituted tyrosine residue (H-Phe-c[-N-epsilon-Lys-Tyr(3-tBu)-betaAla-] (3), H-Phe-c[-N-epsilon-Lys-Tyr(3-tBu)-Gly-] (6), H-Phe-c[-N-epsilon-Lys-Tyr(3-tBu)-Abu-] (7), and H-Phe-c[-N-epsilon-Lys-Tyr(3-tBu)-Ahx-] (8)) showed potent motilin receptor antagonistic activity in the rabbit smooth muscle (pA(2) > 7). The 3-tert-butyl Tyr was found to be the moiety responsible for enhanced binding to the motilin receptor, while the size of the ring had little importance.