Synthesis of canine motilin, a gastric motor activity-stimulating polypeptide, and its N1-substituted analogs.
作者:KOUKI KITAGAWA、KUNIO YONETO、SHINYA KIYAMA、KENSHI ANDO、TATSUHIKO KAWAMOTO、TADASHI AKITA、ATSUKO INOUE、TOMIO SEGAWA
DOI:10.1248/cpb.33.3307
日期:——
The docosapeptide corresponding to the entire amino acid sequence of canine motilin, a newly characterized gastric motor activity-stimulating polypeptide, was synthesized by the conventional solution method. All protecting groups employed were removed by 1 M trifluoromethanesulfonic acid-thioanisole-trifluoroacetic acid and the deprotected peptide was purified by gel-filtration on Sephadex G-25, followed by partition chromatography and reverse phase high performance liquid chromatography. When contractile activity on rabbit duodenal muscle was examined, synthetic canine motilin was as active as synthetic porcine motilin. The relative potencies of Lys1 and Ser1 derivatives prepared in the same manner as canine motilin were ca. 1/1000 and 1/250, respectively.
合成了与犬动脉肽(犬motilin)完整氨基酸序列对应的多肽,这是一种新特征的刺激胃肠运动活性的多肽,使用传统的溶液法合成。所有使用的保护基团均通过1 M三氟甲烷磺酸-硫醚-三氟乙酸去除,去保护的多肽通过Sephadex G-25的凝胶过滤进行纯化,随后进行分配色谱和反相高效液相色谱。在对兔十二指肠肌肉的收缩活性进行检验时,合成的犬动脉肽活性与合成的猪动脉肽相当。以与犬动脉肽相同的方法制备的赖氨酸1和丝氨酸1衍生物的相对效能分别约为1/1000和1/250。