【摘要】 将从黑曲霉菌株Aspergillusniger 96 3克隆并经改造后的植酸酶基因在昆虫 -杆状病毒表达系统中表达 ,SDS PAGE电泳检测蚕体和蛹的表达量分别达到 1.4 3g L血淋巴液和 1.90g L血淋巴液。酶活性测定结果表明 ,在蚕体和蛹的表达活性分别为 4 .6 7× 10 8u L血淋巴液和 5 .99× 10 8u L血淋巴液。该酶活性的最适温度范围为 5 0～6 0℃ ,最适pH值为 5 .5～ 5 .0和 2 .5。研究表明杆状病毒系统表达的植酸酶具有耐酸性和抗高温的特性 ,可以用于生产饲用植酸酶。更多还原

【Abstract】 Phytase gene of Aspergillus niger 963 was cloned into baculovirus transfer vector. DNA of the recombinant vector was co transfected with Bm BacPAK6 DNA into Bm N cells, and recombinant virus was selected by plaque assays. The recombinant virus was identified by Dot blot and Southern blot with the specific probe for phytase gene. Phytase gene was expressed in silkworm larvae and pupae. The expression product was 1.43 g/L haemolymph for silkworm larvae and 1.90 g/L haemolymph for pupae, respectively. The enzymic characteristicses of phytase expressed in baculovirus expression system were studied in this paper.更多还原