A new porcine gastrointestinal 29-residue peptide, galanin, was synthesized in a satisfactory yield by assembling seven peptide fragments followed by deprotection with 1 M trifluoromethane-sulfonic acid-thioanisole in trifluoroacetic acid. Nin-Mesitylenesulfonyltryptophan was employed to suppress indole alkylation during Na-deprotection. β-Cycloheptylaspartate was employed to suppress base-catalyzed succinimide formation. The synthetic peptide exhibited a powerful contractile activity on rat ileum, but not on guinea pig ileum and caused sustained hyperglycemia in dogs.
一种新的猪胃肠道29残基肽——加拉宁,通过组合七个肽片段合成,并在三
氟醋酸中使用1 M三
氟甲烷磺酸-
硫代苯醚进行去保护,获得了令人满意的产率。在
钠去保护过程中,采用了九
甲苯磺酰色
氨酸以抑制
吲哚烷基化。使用β-环庚基
天冬氨酸来抑制碱催化的琥珀
酰亚胺形成。合成的肽在大鼠回肠上表现出强有力的收缩活性,但在豚鼠回肠上没有影响,并且在狗身上引起持续性高血糖。