高海军,杨一飞,孟青

• 1:北京理工大学生命学院

摘要(Abstract)：

L-蛋氨酸(methionine)是一种具有重要生理学功能及应用价值的含硫氨基酸。为了提高蛋氨酸的生物合成,通过敲除蛋氨酸合成的阻遏蛋白基因metJ及苏氨酸合成途径中编码高丝氨酸激酶基因thrB,部分解除了蛋氨酸合成的反馈阻遏,使蛋氨酸积累达到了0.18 g×L~(-1)。根据已知的与蛋氨酸积累有关的功能基因,采用敲除及过表达的技术,从蛋氨酸代谢网络及转运等角度综合优化了蛋氨酸的合成代谢,考察了蛋氨酸合成关键反应、蛋氨酸转运,以及与蛋氨酸合成途径密切相关的苏氨酸合成途径、蛋氨酸循环途径等不同因素对蛋氨酸合成的影响。优化了大肠杆菌蛋氨酸代谢网络途径,强化蛋氨酸向胞外的转运,蛋氨酸产量达到了0.40 g×L~(-1),为进一步提高蛋氨酸合成效率奠定了基础。

关键词(KeyWords)： 蛋氨酸;途径优化;代谢;蛋氨酸转运

Abstract:

Keywords:

基金项目(Foundation): 重大科学仪器设备开发专项(2012YQ0401400802)

作者(Author): 高海军,杨一飞,孟青

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