The heptatriacontapeptide amide corresponding to the entire amino acid sequence of α-form of rat calcitonin gene-related peptide (α-rCGRP) was synthesized by the conventional solution method. All protecting groups employed were removed by treatment with 1 M trifluoromethanesulfonic acid-thioanisole-trifluoroacetic acid, and the deprotected peptide was subjected to airoxidation to form the intramolecular disulfide bond. After purification by gel-filtration on Sephadex G-50, followed by reversed-phase high performance liquid chromatography, a highly purified sample of synthetic α-rCGRP was obtained. In terms of suppression of bone 45Ca-release stimulated by synthetic human parathyroid hormone (1-34), synthetic α-rCGRP was as active as synthetic human CGRP.
采用传统的溶液法合成了与大鼠
降钙素基因相关肽(α-rCGRP)的整个
氨基酸序列相对应的七胜肽酰胺。用 1 M
三氟甲磺酸-
硫代
苯甲醚-
三氟乙酸去除所有保护基团,然后对去保护基团的肽进行氧化反应以形成分子内二
硫键。经 Sephadex G-50 凝胶过滤纯化后,再经反相高效
液相色谱纯化,就得到了高度纯化的合成 α-rCGRP 样品。在抑制合成人
甲状旁腺激素(1-34)刺激的骨 45Ca 释放方面,合成 α-rCGRP 与合成人 CGRP 具有同样的活性。