The dotetracontapeptide corresponding to the revised amino acid sequence of porcine GIP (glucose-dependent insulinotropic polypeptide; originally named gastric inhibitory polypeptide) was synthesized by assembling eight peptide fragments of established purity, followed by thioanisole-mediated deprotection with trifluoromethanesulfonic acid in trifluoroacetic acid. The cycloheptyl esters of aspartic acid and glutamic acid were employed to suppress base-catalyzed side reactions. When tested in dogs, the synthetic peptide produced a significant increase of immunoreactive insulin in blood under background infusion of glucose.
与猪GIP(
葡萄糖依赖性
胰岛素促效肽;最初名为胃抑制肽)的修订
氨基酸序列相对应的二十四肽,是通过组合八个纯度已知的肽片段合成的,然后用
三氟乙酸中的
三氟甲磺酸和
硫代
苯甲醚进行脱保护。
天冬氨酸和谷
氨酸的环庚酯被用来抑制碱催化副反应。当在狗身上进行测试时,在背景
葡萄糖输注下,合成肽可显著增加血液中的免疫反应性
胰岛素。