作者:Ken’ichi Igano、Yuriko Minotani、Nobuo Yoshida、Masao Kono、Ken Inouye
DOI:10.1246/bcsj.54.3088
日期:1981.10
A peptide corresponding to the thirty-one amino acid sequence of human proinsulin C-peptide (positions 33–63 of proinsulin) was synthesized by the solid-phase method. The product was purified consecutively by gel filtration, DEAE-cellulose chromatography, and high-performance liquid chromatography (HPLC). The purified material behaved as a single component in reversed-phase HPLC, gave correct amino acid ratios, and was not distinguished from natural human C-peptide in terms of immunoreactivity and chromatographic behaviors. The α→β transpeptidation at the Asp-Leu sequence, possible to occur associated with the HF cleavage, was studied using model peptides to demonstrate that the formation of β-peptide was 3–4% regardless of whether the β-carboxylic acid is free or protected as a benzyl ester.
一段对应于人类前胰岛素C肽(前胰岛素分子中的第33至63位氨基酸序列)的三十一个氨基酸序列的多肽通过固相法被合成。产物依次通过凝胶过滤、DEAE-纤维素色谱法和高性能液相色谱法(HPLC)进行纯化。纯化后的物质在反相HPLC中表现为单一组分,呈现出正确的氨基酸比例,并且在免疫反应性和色谱行为上与天然人C肽无法区分。关于与HF切割相关可能发生的Asp-Leu序列上的α→β转肽反应,通过模型肽的研究表明,无论β-羧酸是自由状态还是被保护为苄酯状态,β-肽的形成率都为3-4%。