by a D-Lys residue in Boc[Nle28,31]CCK27-33, a derivative as active as CCK8. The linear peptide Boc-Asp-Tyr(SO3H)-Nle-D-Lys-Trp-Nle-Asp-Phe-NH2 was cyclized through amide bond formation between the side chains of Asp26 and D-Lys29 to give the peptide Boc-Asp-Tyr(SO3H)-Nle-D-Lys-Trp-Nle-Asp-Phe-NH2. Analogues 1 and 2 were shown to stimulate secretion of amylase from rat pancreas with a potency that
通过替换柔性Gly29残基,研究了CCK26-33 [Asp-Tyr(SO3H)-Met-Gly-Trp-Met-Asp-Phe-NH2](CCK8)周围受体的可能异质性在CCK8折叠中,通过Boc [Nle28,31] CCK27-33中的D-Lys残基,具有与CCK8同样活性的衍
生物。线性肽Boc-Asp-Tyr(SO3H)-Nle-D-Lys-Trp-Nle-Asp-Phe-NH2通过Asp26和D-Lys29侧链之间的酰胺键形成环化,得到肽Boc-Asp -Tyr(SO3H)-Nle-D-Lys-Trp-Nle-Asp-Phe-NH2。已显示类似物1和2刺激大鼠胰腺
淀粉酶的分泌,其效力分别比CCK8低40和80倍。相反,两种肽均作为CCK8诱导的豚鼠回肠收缩的弱拮抗剂(
EC50约为10(-5)M)。尽管它们的C末端Asp32残基发生酰胺化,但从1和2中除去苯丙
氨酸获得的肽3和4在所