Analogs of 1-phosphonooxy-2,2-dihydroxy-3-oxo-5-(methylthio)pentane, an acyclic intermediate in the methionine salvage pathway: a new preparation and characterization of activity with E1 enolase/phosphatase from Klebsiella oxytoca
作者:Yalin Zhang、Melissa H Heinsen、Milka Kostic、Gina M Pagani、Thomas V Riera、Iva Perovic、Lizbeth Hedstrom、Barry B Snider、Thomas C Pochapsky
DOI:10.1016/j.bmc.2004.05.002
日期:2004.7
action of another enzyme, E1 enolase/phosphatase, on precursor 1-phosphonooxy-2,2-dihydroxy-3-oxo-5-methylthiopentane (1). Simple syntheses of several analogs of 1 are described, and their activity as substrates for E1 enolase/phosphatase characterized. A new bacterial overexpression system and purification procedure for E1, a member of the haloacid dehalogenase (HAD) superfamily, is described, and
甲硫氨酸抢救途径允许在从S-腺苷甲硫氨酸(SAM)形成甲硫基腺苷(MTA)时体内恢复甲硫氨酸的甲硫基部分。含铁(II)的阿昔洛酮双加氧酶(ARD)催化催产克雷伯菌中的倒数第二步,即阿昔洛酮1,2-二羟基-3-氧代-5-(甲硫基)戊-1-的氧化裂解。通过双氧烯(2)得到甲酸酯和2-氧代-4-(甲硫基)丁酸酯(3)。与Ni(II)结合的形式(Ni-ARD)催化一个偏向旁路,形成3-(甲硫基)丙酸酯(4),一氧化碳和甲酸酯。在另一种酶E1烯醇化酶/磷酸酶的作用下,对前体1-膦酰氧-2,2-二羟基-3-氧代-5-甲基硫戊烷(1)的作用形成了乙炔基酮2。描述了1的多个类似物的简单合成,及其作为E1烯醇酶/磷酸酶底物的活性进行了表征。描述了一种新的细菌过表达系统和E1(卤代酸脱卤酶(HAD)超家族的成员)的纯化程序,并对酶进行了进一步表征。