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Purification and Characterization of the Dehalogenases from Marine Bacterium Pseudomonas sp.DEH138A Isolated from Marine Sponge Hymeniacidon perlevis
Author(s): ZHANG Jin-you, WANG Ya-yue, CAO Xu-peng, XUE Song, ZHANG Wei, YANG Yan-kun
Pages: 137-
142
Year: 2013
Issue:
2
Journal: Guangxi Sciences
Keyword: 脱卤酶; 假单胞菌; 分离纯化; 性质表征;
Abstract: 用硫酸铵沉淀,Q-SepharoseHP离子交换层析,Superdex 200凝胶过滤层析和Mono-Q离子交换层析方法,对从大连潮间带繁茂膜海绵中分离得到的1株假单胞菌DEH138A(Pseudomonas sp.DEH138A)中的脱卤酶进行分离纯化和酶学性质表征.结果显示,假单胞菌菌株DEH138A中含有一种能降解L-2-氯丙酸的L-2-卤代酸脱卤酶(L-DEX).经纯化后,L-DEX亚基分子量为27.8 kDa,全酶分子量为42.5 kDa,推测其为一个二聚体蛋白.L-DEX最适pH值及最适反应温度分别为10.0和30℃,Km值为0.63 mmol/L.L-DEX能够作用于多种2-卤代酸,而且对单溴乙酸的脱卤效果最好.DTT和EDTA对L-DEX无抑制作用,Cu2+和Co2+对L-DEX有明显的抑制作用.L-DEX具有立体选择性等独特的酶学特性,在环境修复、精细化工等领域具有潜在的应用价值.
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