Synthesis and Circular Dichroism Spectra of Sperm Whale Myoglobin-(57-96)-Tetracontapeptide.
作者:Chikao Hashimoto、Ichiro Muramatsu
DOI:10.1246/bcsj.66.181
日期:——
A protected sperm whale myoglobin-(57—96)-tetracontapeptide (29) was synthesized by successive condensations of three fragments, Boc–(70 —76)–OH, Boc–(62—69)–OH, and Boc–(57— 61)–OH, to a partially protected eicosapeptide ester, H–(77—96)– OBzl. After removal of the protecting groups of 29, the crude product was purified with reversed-phase high-performance liquid chromatography to yield sperm whale myoglobin-(57—96)-tetracontapeptide (30). The circular dichroism spectra showed that this peptide was in a random conformation in 0.10 M phosphate buffer (pH 6.50) and in a 69% α-helix conformation in 60% 2,2,2-trifluoroethanol–0.10 M phosphate buffer (pH 6.50).
通过连续缩合三个片段 Boc–(70 —76)–OH、Boc–(62–69)–OH 和 Boc–(57) 合成了受保护的抹香鲸肌红蛋白-(57—96)-十碳肽 (29) — 61)–OH,部分保护的二十肽酯,H–(77–96)– OBzl。去除29的保护基后,用反相高效液相色谱纯化粗产物,得到抹香鲸肌红蛋白-(57—96)-四十二肽(30)。圆二色光谱显示该肽在 0.10 M 磷酸盐缓冲液 (pH 6.50) 中呈随机构象,在 60% 2,2,2-三氟乙醇–0.10 M 磷酸盐缓冲液 (pH 6.50) 中呈 69% α-螺旋构象。