Catalytic and structural insights into a stereospecific and thermostable Class II aldolase HpaI from Acinetobacter baumannii
作者:Pratchaya Watthaisong、Asweena Binlaeh、Aritsara Jaruwat、Narin Lawan、Jirawat Tantipisit、Juthamas Jaroensuk、Litavadee Chuaboon、Jittima Phonbuppha、Ruchanok Tinikul、Pimchai Chaiyen、Penchit Chitnumsub、Somchart Maenpuen
DOI:10.1016/j.jbc.2021.101280
日期:2021.11
Aldolases catalyze the reversible reactions of aldol condensation and cleavage and have strong potential for the synthesis of chiral compounds, widely used in pharmaceuticals. Here, we investigated a new Class II metal aldolase from the p-hydroxyphenylacetate degradation pathway in Acinetobacter baumannii, 4-hydroxy-2-keto-heptane-1,7-dioate aldolase (AbHpaI), which has various properties suitable
醛缩酶催化醛醇缩合和裂解的可逆反应,具有很强的合成手性化合物的潜力,广泛用于药物。在这里,我们研究了鲍曼不动杆菌对羟基苯乙酸酯降解途径中的一种新的 II 类金属醛缩酶,即 4-羟基-2-酮-庚烷-1,7-二酸醛缩酶 (AbHpaI),它具有适合生物催化的各种特性,包括立体选择性/立体特异性、广泛的醛利用、热稳定性和溶剂耐受性。值得注意的是,AbHpaI 使用 Zn2+ 作为天然辅因子与此类中的其他酶不同。AbHpaI 还可以使用除 Ca2+ 之外的其他金属离子 (M2+) 辅助因子进行催化。我们发现 Zn2+ 产生最高的酶复合物热稳定性(Tm 为 87 °C)和溶剂耐受性。所有 AbHpaI•M2+ 复合物均表现出对 (4R)-2-keto-3-deoxy-D-galactonate ((4R)-KDGal) 的优先裂解超过 (4S)-2-keto-3-deoxy-D-gluconate ((4S)