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amrG1基因在谷氨酸棒杆菌乙酸活化中的作用 被引量:1

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摘要 谷氨酸棒杆菌Corynebacteriumglutamicum可以利用乙酸为碳源和能源进行生长.乙酸代谢中涉及乙酸活化的两个酶为磷酸转乙酰酶PTA和乙酸激酶AK,它们是由pta-ack操纵子经诱导表达产生的.采用转座子挽救法,我们从调控突变株C.glutamicumG25中获得了amrG1和amrG2两个目标基因.经分析鉴定,amrG1基因(NCBIGenBank接受号为AF532964)可能参与乙酸代谢调控,编码作用于pta-ack操纵子的一个调控因子.该调控因子基因序列全长732bp,开放阅读框含有243个氨基酸,分子量约为27kD.通过基因定点缺失和过量表达技术,在谷氨酸棒杆菌野生型菌株中分别构建了amrG1基因缺失菌株和表达菌株,并研究了它们在含有葡萄糖和/或乙酸不同碳源的基本培养基上生长时产生的PTA和AK酶活性特征.酶活性测定结果发现其中的amrG1基因缺失菌株和表达菌株存在着与野生型菌株不同的一系列酶学特征,分析显示:以野生型菌株为对照,amrG1基因缺失菌株在含有葡萄糖碳源的培养基上生长时表现出较高的PTA和AK酶活性,并且在葡萄糖和乙酸两种碳源上生长时表现出与乙酸碳源上生长时几乎同样的PTA和AK酶活性;amrG1基因过量表达对葡萄糖碳源上生长产生的PTA和AK酶活性有一定程度的抑制,即表现出与基因缺失情况相反的调控效应.根据以上结果分析。
出处 《中国科学(C辑)》 CSCD 北大核心 2004年第3期223-231,共9页 Science in China(Series C)
基金 德国政府DAAD奖学金 国家留学回国人员启动基金(批准号: 108201-G50229)
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