Angiotensin-Converting Enzyme (ACE) Inhibitory Activity and Mechanism Analysis of <i>N</i>-(1-<scp>D</scp>eoxy-<scp>d</scp>-fructos-1-yl)-histidine (Fru-His), a Food-Derived Amadori Compound
was a competitive inhibitor according to the enzyme inhibition kinetic analysis. The interaction between ACE and Fru-His occurred spontaneously mainly through hydrogen bonding, and the process was accompanied by fluorescence quenching and the alteration of the secondary structure of ACE. The molecular docking data supported the above results. Fru-His was attached to ACE’s S1 active pocket through hydrogen
Abstract High-resolution, 1 H- (360 and 400 MHz) and 13 C-n.m.r. (90.52 and 100.57 MHz) spectra of the mutarotated N -(1-deoxy- d -fructos-1-yl)- l -amino acids (“fructose-aminoacids”) 1–14 in D 2 O are reported. The 1 H spectra allow unambiguous assignment of the signals of the major constituents (β-pyranose forms). Signals of the other forms are not well resolved and therefore not interpreted. The
N.M.R. untersuchungen und analytik von N-(1-desoxy-d-fructos-1-YL)-N-nitroso-l-aminosäuren (“N-nitroso0fructoseaminosäuren”)
作者:Harald Röper
DOI:10.1016/0008-6215(87)80131-3
日期:1987.7
Abstract Thirteen N -(1-deoxy- d -fructos-1-yl)- N -nitroso- l -amino acids were prepared, in 83–95% yield, by nitrosation of the corresponding “fructose-amino acids” with sodium nitrite in water-hydrochloric acid, at pH 3. The 1 H-n.m.r. spectra were complicated by the presence of different sugar-ring forms (α,β-furanoses and-pyranoses). In addition, signal doubling for all proton resonances were