Studies on peptides. CXII. Alternative synthesis of heptacosapeptide, a new gastrointestinal polypeptide.
作者:NOBUTAKA FUJII、WI LEE、HARUAKI YAJIMA、MOTOYUKI MORIGA、KAZUHIKO MIZUTA
DOI:10.1248/cpb.31.3503
日期:——
A recently found gastrointestinal hormone, PHI (heptacosapeptide), was synthesized in a different manner from that of Moroder et al. [Z. Naturforsch., 37b, 772 (1982) ]. Our synthesis was carried out by successive azide condensation of six peptide fragments (23-27, 19-22, 15-18, 11-14, 7-10, and 1-6), followed by deprotection with 1 M trifluoromethanesulfonic acid-thioanisole in trifluoroacetic acid. The deprotected peptide was purified by gel-filtration on Sephadex G-25, followed by ion-exchange chromatography on CM-Biogel A and reverse phase high-performance liquid chromatography on μBondapak C18. The homogeneous product thus obtained produced a remarkable decrease in systemic blood pressure in anesthetized rats. In addition, Nα-biotinyl-PHI was synthesized for histochemical receptor-binding studies.
最近发现的一种胃肠激素PHI(七十七肽)与Moroder等人合成的方式不同[Z. Naturforsch., 37b, 772 (1982)]。我们的合成是通过六个肽片段(23-27、19-22、15-18、11-14、7-10和1-6)的连续叠加聚合反应进行的,随后用1 M三氟甲烷磺酸-硫醚在三氟乙酸中去保护。去保护的肽通过Sephadex G-25进行凝胶过滤纯化,随后进行CM-Biogel A上的离子交换色谱以及μBondapak C18上的反相高效液相色谱。由此获得的均匀产品在麻醉大鼠中显著降低了全身血压。此外,合成了Nα-生物素化-PHI用于组织化学受体结合研究。