Serine Hydroxymethyl Transferase fromStreptococcus thermophilus andL-Threonine Aldolase fromEscherichia coli as Stereocomplementary Biocatalysts for the Synthesis of β-Hydroxy-α,ω-diamino Acid Derivatives
作者:Mariana L. Gutierrez、Xavier Garrabou、Eleonora Agosta、Stefano Servi、Teodor Parella、Jesús Joglar、Pere Clapés
DOI:10.1002/chem.200800031
日期:2008.5.19
stereoselective, and in turn, gave excellent conversion. It was also found that treatment of the prepared N-Cbz-gamma-amino-beta-hydroxy-alpha-amino acid derivatives with potassium hydroxide (1 m) resulted in the spontaneous formation of 2-oxazolidinone derivatives of the beta-hydroxyl and gamma-amino groups in quantitative yield. This reaction might be useful for further chemical manipulations of the products
来自嗜热链球菌(SHMT)的新型丝氨酸羟甲基转移酶和来自大肠杆菌(LTA)的L-苏氨酸醛缩酶被用作立体互补生物催化剂,用于将甘氨酸醛糖醛醇加成到N-Cbz氨基醛和苄氧基乙醛(Cbz =苄氧基羰基)上。两种苏氨酸醛缩酶均归类为低特异性L-苏氨酸醛缩酶,通过控制反应参数(例如温度,甘氨酸浓度和反应介质),SHMT仅以34-60%的转化率生成L-赤型非对映异构体,而LTA生成L-苏式非对映异构体,其非对映异构体比例为30:70至16:84,产品转化率为40-68%。SHMT是描述的最具立体选择性的L-苏氨酸醛缩酶。除其他因素外,这归因于其对活动温度的依赖性:在4摄氏度时,SHMT具有较高的合成活性,但对L-苏氨酸的逆醛醇活性可忽略不计。因此,动力学L-赤型异构体受到极大的欢迎,并且反应实际上是不可逆的,高度立体选择性的,并因此产生了优异的转化率。还发现用氢氧化钾(1m)处理制得的N-Cbz-γ-