Stereochemistry and mechanism of the conversion of 5-aminolaevulinic acid into porphobilinogen catalysed by porphobilinogen synthaseElectronic supplementary information (ESI) available: purification and assay protocols and plots of enzymic activity vs. substrate concentration. See http://www.rsc.org/suppdata/ob/b3/b302509h/
作者:Catherine E. Goodwin、Finian J. Leeper
DOI:10.1039/b302509h
日期:2003.4.23
(3R)- and (3S)-Deuteriated forms of 5-aminolaevulinic acid have been synthesised and the (3R)-form shows a significantly larger isotope effect when incubated with porphobilinogen synthase from bovine liver and from Bacillus subtilis; based on this and on available crystal structures, a modified mechanism for the enzymic reaction is proposed.
合成了(3R)-和(3S)-脱胎形式的 5-aminolaevulinic acid,(3R)-形式的 5-aminolaevulinic acid 在与牛肝脏和枯草芽孢杆菌中的门冬氨酸合成酶孵育时显示出明显更大的同位素效应;基于这一点和现有的晶体结构,提出了酶促反应的改进机制。