塑蛋白乙转移酶GNAT1与GNAT2形成复合体,但它们的相互作用对于状态转换是不可或缺的
Annika Brünje1, Magdalena Füßl1, Jürgen Eirich1
1Plant Physiology, Institute of Plant Biology and Biotechnology (IBBP), University of Münster, Münster, Germany.
植物叶绿体酶GNAT1进行N端乙化,并与GNAT2和GNAT3相互作用. 复杂的形成微调了乙化活动,揭示了塑代谢的新调节.
科学领域:
- 植物分子生物学 植物分子生物学
- 叶绿体生物学 叶绿体生物学
- 后翻译修改后的修改.
背景情况:
- 蛋白质N-乙化是真核生物中的一个关键的协同和后翻译性修饰,在植物叶绿体中发现.
- 最近在Arabidopsis中发现了一种新型的八种具有双重活性的塑乙转移酶家族.
- 包括GNAT1,GNAT2和GNAT3在内的NAA90子组是基因学上相关的乙转移酶.
研究的目的:
- 为了描述GNAT1的功能,一种与GNAT2密切相关的质细胞乙转移酶.
- 研究GNAT1.1的体内和体外N端乙化活性.
- 探索质体内GNAT1,GNAT2和GNAT3之间的相互作用.
主要方法:
- 遗传学分析以确定NAA90亚组.
- 在高光条件下对gnat1和gnat2突变体的表型分析.
- 在实验室中使用重组GNAT1.1进行乙化试验.
- 在gnat1淘汰赛线的体内N终端乙组概况.
- 同免疫沉与质谱相结合,以确定蛋白质相互作用.
主要成果:
- GNAT1对状态过渡不至关重要,但影响gnat1突变体中的甲状腺膜包装.
- 在体外和体内,GNAT1表现出强大的N端乙化活性,向塑蛋白.
- GNAT1的基质频谱是GNAT2的子集.
- GNAT1与GNAT2相互作用,GNAT2与GNAT3相互作用,表明复杂的形成.
- 在质体中发现了两种不同的乙转移酶复合体.
结论:
- GNAT1在质细胞乙化中发挥作用,与GNAT2在状态过渡中的作用不同.
- 复杂的NAA90乙转移酶 (GNAT1,GNAT2,GNAT3) 的形成对于调节乙化活动至关重要.
- 这些发现揭示了塑代谢中乙化依赖调整的新型调节机制.
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