C]Gly[ 15 N]AlaGlyAla-OPac and Boc-[1- 13 C]Gly[ 15 N]ValGlyAla-OPac, where Boc is t-butoxycarbonyl, OMe is methyl ester, OPac is phenacyl ester, Ala is alanine, Gly is glycine and Val is valine. From the comparisons of the 15 N chemical shift tensors and the orientations of the principal axis system relative to the molecular symmetry axes among three compounds having [1- 13 C]Ala[ 15 N]Gly units, it
摘要 确定了家蚕丝的 13 C 15 N 双标记模型肽的 15 N 和 13 C 羰基碳位点的 15 N 和 13 C
化学位移张量,以及主轴系统相对于分子对称轴的取向。丝心蛋白,即 Boc-[1- 13 C]Ala[ 15 N]Gly-OMe、Boc-[1- 13 C]Ala[ 15 N]GlyAlaGly-OPac、Boc-AlaGly[1- 13 C]Ala[ 15 N]GlyAlaGly-OPac、Boc-[1- 13 C]Gly[ 15 N]AlaGlyAla-OPac、Boc-GlyAla[1- 13 C]Gly[ 15 N]AlaGlyAla-OPac 和 Boc-[1- 13 C] Gly[ 15 N]ValGlyAla-OPac,其中 Boc 是叔丁氧基羰基,OMe 是甲酯,OPac 是苯甲酰酯,Ala 是丙
氨酸,Gly 是甘
氨酸,Val 是缬
氨酸。从具有 [1- 13