Intramolecular Ligation of Carbonyl Oxygen to Central Zinc in Synthetic Oligopeptide-Linked Zinc-Porphyrins
作者:Hitoshi Tamiaki、Ayumu Kiyomori、Kazuhiro Maruyama
DOI:10.1246/bcsj.67.2478
日期:1994.9
Oligopeptide-linked zinc-porphyrins were prepared (oligopeptide = –Phem–Alan–OMe and porphyrin = 5,15-diaryl-2,3,7,8,12,13,17,18-octaethylporphyrin). 1H NMR, IR, visible, and CD spectra of the synthetic molecule in a chlorinated methane (CDCl3 or CH2Cl2) showed that the carbonyl oxygen of the N-terminal amino acid of the linked peptide should ligate the central zinc metal in the molecule as the axial ligand to form a pentacoordinated zinc-porphyrin. The coordination of the zinc with the peptide framework changed the optical and electrical properties, indicating that such ligation might control the reactivity in biological metallotetrapyrrole–protein systems as well as the coordination to the peptide residue.
通过寡肽连接的锌卟啉被制备出来(寡肽=–Phem–Alan–OMe,卟啉=5,15-二芳基-2,3,7,8,12,13,17,18-八乙基卟啉)。合成分子在氯化甲烷(CDCl3或CH2Cl2)中的1H NMR、IR、可见光和CD光谱显示,连接肽的N-末端氨基酸的羰基氧应该作为轴向配体配位到分子中的中心锌金属,形成五配位的锌卟啉。锌与肽骨架的配位改变了光学和电学性质,表明这种配位可能在生物金属四吡咯蛋白系统以及肽残基的配位中控制反应性。