以谷氨酸棒杆菌关键酶乙酰羟酸合酶调节亚基IlvN的相互作用蛋白研究为切入点,筛选出与其存在相互作用的蛋白。针对实验室选育的1株缬氨酸高产菌株Corynebacterium glutamicum XV,利用his-pull down技术捕获与乙酰羟酸合酶存在相互作用的蛋白质,通过液质联用的方法对差异蛋白进行鉴定,经蛋白电泳和液质分析后,鉴定得到45种蛋白,其中,大部分蛋白为参与翻译过程的核糖体蛋白,此外,还包括参与能量产生与转换、氨基酸转运与代谢、碳水化合物转运与代谢、脂转运与代谢、信号传导等过程的蛋白质。乙酰羟酸合酶是支链氨基酸合成过程中的一个重要关键酶,与其存在相互作用的蛋白涉及代谢过程中的多个方面,这些相互作用的蛋白对于支链氨基酸的合成代谢可能产生影响,所得蛋白相互作用结果对进一步指导协调代谢工程改造具有重要的意义。
Proteins that interacted with the regulatory subunit of acetohydroxy acid synthase (IlvN) in Corynebacterium glutamicum were studied by his-pull down technique and liquid chromatography-mass spectrometry. Totally, 45 proteins were identified and most of them were ribosomal proteins involved in translation. The proteins involved in energy production and conversion, signal transduction , as well as transport and metabolism of amino acids, carbohydrates and lipids were also included. As acetohydroxy acid synthase is a key enzyme in branched-chain amino acid synthesis, the identification of its interacting proteins has great significance for further coordinate metabolic engineering.
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