Alternative synthesis of porcine secretin and apparent autolysis of the product.
作者:SHINYA KIYAMA、KOUKI KITAGAWA、TADASHI AKITA、WILLIAM Y. CHEY、AVIDIN AYALP、AKIKO OTSUKI、SUSUMU FUNAKOSHI、NOBUTAKA FUJII、HARUAKI YAJIMA
DOI:10.1248/cpb.33.3205
日期:——
Porcine secretin was synthesized by the trifluoromethanesulfonic acid deprotecting procedure. Release of the biologically important His1-residue from synthetic secretin was noted when the secretin was incubated in an aqueous solution at 37°C under nearly neutral conditions. Apparent autolysis of the N-terminal tetrapeptide, His-Ser-Asp-Gly, was examined by using 5 peptide analogs, and the participation of the β-carboxyl group of Asp and the basic amino acid, His, in this unusual phenomenon was deduced. Hydrolysis of the peptide bonds between Asp-Ser (15-16) and Asp-Gly (3-4) was also noted when the above incubated solution was examined by high performance liquid chromatography.
猪胰泌素是通过三氟甲磺酸脱保护程序合成的。在近乎中性的条件下,将合成的泌乳素置于 37°C 的水溶液中培养,可以发现泌乳素中具有重要生物学意义的 His1 残基被释放出来。使用 5 种肽类似物对 N 端四肽 His-Ser-Asp-Gly 的明显自溶进行了研究,并推断出 Asp 的 β 羧基和碱性氨基酸 His 参与了这一不寻常现象。用高效液相色谱法检测上述培养液时,还发现 Asp-Ser(15-16)和 Asp-Gly(3-4)之间的肽键发生了水解。