Mechanism of the enzymic elimination of ammonia from 3-substituted aspartic acids by 3-methylaspartase
作者:Nigel P. Botting、Mahmoud Akhtar、Mark A. Cohen、David Gani
DOI:10.1039/c39870001371
日期:——
Kinetic experiments with 3-methylaspartase, using aspartic, 3-methylaspartic, and 3-ethylaspartic acid and the appropriate C-3 deuteriated isotopomers as substrates, reveal that C(3)–H bond cleavage is partially rate-limiting for 3-methylaspartic acid, much less rate-limiting for 3-ethylaspartic acid, and not rate-limiting at all for aspartic acid.
用3-甲基天冬氨酸,天冬氨酸,3-甲基天冬氨酸和3-乙基天冬氨酸以及适当的C-3氘代异位异构体作为底物的动力学实验表明,C(3)–H键裂解部分限制了3-甲基天冬氨酸的速率,对3-乙基天冬氨酸的限速作用要小得多,而对天冬氨酸根本没有限速作用。