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恶臭假单胞菌ND6菌株中与萘降解相关的新型水杨醛脱氢酶NahV

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摘要 在大肠杆菌中表达了Pseudomonas putida ND6菌株中与萘降解有关的水杨醛脱氢酶同工酶NahV,并对其酶学性质进行了研究.结果表明,NahV与ND6菌株中经典的水杨醛脱氢酶NahF的氨基酸序列同源性较低,是一种新的水杨醛脱氢酶.对NahV和NahF的酶动力学研究结果表明,NahF具有更高的催化效率,而NahV对水杨醛和NAD+的亲和力更强.ND6菌株的NahV和NahF都有较宽的底物范围,可以催化水杨醛、5-氯水杨醛、甲醛、间硝基苯甲醛、邻硝基苯甲醛、邻甲氧基苯甲醛、戊二醛、辛醛和乙二醛的脱氢反应,但对不同底物的催化效率不同.Fe2+,Cu2+和Zn2+对NahV有激活作用,而NahF只能被Fe2+激活.NahF具有更好的热稳定性,在50℃保温30min仍有72.8%的酶活力,而NahV则丧失了88.8%的酶活力.DNA斑点杂交结果表明,类nahF基因在本研究检测的两种来源的萘降解细菌中都存在,而类nahV基因只存在于一种来源的萘降解细菌中.
出处 《科学通报》 EI CAS CSCD 北大核心 2007年第11期1257-1262,共6页 Chinese Science Bulletin
基金 国家自然科学基金(批准号:30270274) 中国博士后科学基金(批准号:2005038461)资助项目
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