Studies of Bitter Peptides from Casein Hydrolyzate. VII. Bitterness of the retro-BPIa (Val–Ile–Phe–Pro–Pro–Gly–Arg) and Its Fragments
作者:Toshiaki Shigenaga、Ken Otagiri、Hidenori Kanehisa、Hideo Okai
DOI:10.1246/bcsj.57.103
日期:1984.1
To explain the bitter taste exhibited by BPIa (Arg–Gly–Pro–Pro–Phe–Ile–Val) which was isolated from casein hydrolyzate, we have proposed the following requirement: its characteristic spatial structure: the basic moiety in the N-terminal and the hydrophobic moiety in the C-terminal were affected to each other by prolylprolyl residue, is necessary for the bitterness to be exhibited. As for BPIc (Val–Tyr–Pro–Phe–Pro–Pro–Gly–Ile–Asn-His), which is the other fraction, although it exhibited as strong and bitter a taste as BPIa, the basic moiety of BPIc is located in the C-terminal and its hydrophobic moiety is located in the N-terminal. The authors synthesized retro-BPIa with the reverse peptide sequence and its fragments. The retro-BPIa exhibited as strong and bitter a taste as BPIa. However, the bitterness of the fragments of retro-BPIa was far weaker than that of retro-BPIa.
为了说明从酪蛋白水解物中分离出的BPIa(Arg–Gly–Pro–Pro–Phe–Ile–Val)所表现出的苦味,我们提出了以下要求:其特征空间结构,即N末端的基本部分与C末端的疏水部分通过脯氨酸残基相互影响,是表现苦味所必需的。至于另一种成分BPIc(Val–Tyr–Pro–Phe–Pro–Pro–Gly–Ile–Asn-His),虽然它表现出的味道与BPIa一样强烈而苦涩,但BPIc的基本部分位于C末端,疏水部分位于N末端。作者合成了逆BPIa,其肽序列相反及其片段。逆BPIa表现出的苦味同样强烈,但逆BPIa片段的苦味远弱于逆BPIa。