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.
Use of NN′-isopropylidene dipeptides in peptide synthesis
作者:Paul M. Hardy、David J. Samworth
DOI:10.1039/p19770001954
日期:——
The direct condensation of dipeptides with acetone has been found generally useful for the preparation of 2-(2,2,4-trialkyl-5-oxoimidazolidin-1-yl)alkanoic acids. Peptidesynthesisusing these NN′-isopropylidenedipeptides may be conveniently carried out with dicyclohexylcarbodi-imide; such couplings are racemisation-free even in the absence of additives. Subsequent deprotection may be effected by
Blood based biomarkers for diagnosing atherosclerotic coronary artery disease
申请人:Global Genomics Group, LLC
公开号:US10254272B2
公开(公告)日:2019-04-09
The invention, in some aspects, relates to methods for evaluating a human subject for having atherosclerotic coronary artery disease (ASCAD) or as having a coronary atherosclerotic plaque. In some aspects, the invention relates to methods and kits useful for diagnosing, classifying, profiling and treating atherosclerotic CAD and or a coronary atherosclerotic plaque.
Chemical isotope labeling-assisted liquid chromatography-mass spectrometry enables sensitive and accurate determination of dipeptides and tripeptides in complex biological samples
作者:Feng-Qing Huang、Yu Wang、Ji-Wen Wang、Dai Yang、Shi-Lei Wang、Yuan-Ming Fan、Raphael N. Alolga、Lian-Wen Qi
DOI:10.1016/j.cclet.2024.109670
日期:2024.11
their unique features and diverse biological functions. Achieving rapid separation and accurate quantification, however, remains a challenge because of their low abundance and the co-existence of numerous structural isomers. In this study, we developed a novel approach using isotopechemical labeling for ultrasensitive determination of di/tripeptides in biologicalsamples. We successfully synthesized a