Synthesis of Two Possible Disulfide Bonds Containing Peptide Fragments (Cys<sup>6</sup>–Cys<sup>47</sup>, Cys<sup>48</sup>–Cys<sup>52</sup>(Type I), and Cys<sup>6</sup>–Cys<sup>48</sup>, Cys<sup>47</sup>–Cys<sup>52</sup>(Type II) of h-IGF-I) for the Identification of Disulfide Bond Linkage in Recombinantly Produced h-IGF-I
作者:Michio Iwai、Hisashi Yamada、Yoshinori Ishii、Kouichi Tamura、Mineo Niwa、Masakazu Kobayashi
DOI:10.1246/bcsj.72.1827
日期:1999.8
The primary structure of human IGF-I, except for the disulfide bond system, has been reported by Rinderknecht and Humbel. IGF-I afforded the corresponding characteristic peptide fragments on V8 protease digestion, which contained Cys6, Cys47, Cys48, and Cys52. Two possible fragments, Type I with Cys6–Cys47 and Cys48–Cys52 and Type II with Cys6–Cys48 and Cys47–Cys52 of h-IGF-I(4-9,47-53), were chemically synthesized. The disulfide bond system of IGF-I was unequivocally determined to be the Type-II form along with Cys18–Cys61. Interestingly, the Type-I system was included in the disulfide bond isomer produced as the main by-product in the refolding step on IGF-I synthesis by the recombinant DNA method.
除了二硫键系统外,人类IGF-I的主要结构已由Rinderknecht和Humbel报道。在V8蛋白酶消化过程中,IGF-I提供了相应的特征性肽片段,这些片段含有Cys6、Cys47、Cys48和Cys52。两种可能的片段,类型I含有Cys6–Cys47和Cys48–Cys52,类型II含有Cys6–Cys48和Cys47–Cys52的h-IGF-I(4-9,47-53),被化学合成。IGF-I的二硫键系统被明确确定为类型II形式,并伴随Cys18–Cys61。有趣的是,类型I系统包含在通过重组DNA方法合成IGF-I的复性步骤中产生的主要副产品——二硫键异构体中。