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D6PK等离子膜极性需要重复的CXX(X) P动机和PDK1-依赖酸化

Alina Graf¹, Alkistis Eleftheria Lanassa Bassukas¹, Yao Xiao^1,2

¹Plant Systems Biology, School of Life Sciences, Technical University of Munich, Freising, Germany.

|January 26, 2024

概括

新的研究揭示了D6蛋白激酶 (D6PK) 在血上是如何调节的. 酸化对膜结合至关重要,而酸化则控制其运输和定位,影响植物生长.

科学领域:

植物生物学植物生物学
分子细胞生物学分子细胞生物学
生物化学生物化学

背景情况:

D6蛋白酶 (D6PK) 是阿拉比多西斯莉亚的一种血膜相关酶.
D6PK调节了PIN-FORMED辅酶运输体,影响了极性辅酶运输,这对植物发育至关重要.
建立和维持D6PK等离子膜极性的机制以前是未知的.

研究的目的:

阐明调节D6PK等离子体膜关联和极性的分子机制.
确定S-化和酸化在D6PK局部化和功能中的作用.

主要方法:

研究了通过S-化在D6PK中间域中氨酸残留的作用.
研究了酸化对邻近的血清残留物的影响,包括对3-PHOSPHOINOSITIDE-DEPENDENT PROTEIN KINASE的依赖.
评估了D6PK膜协会,运输,停留时间和横向扩散.

主要成果:

在D6PK中位域中重复的CXX(X) P图案是S-化,这对于膜协会至关重要.
D6PK的S-化是构成性的,在细胞内运输过程中不受调节.
血清残留的酸化受3 - 氨基酸依赖蛋白激酶的影响,促进D6PK的运输,调节其在血内停留时间,并限制横向扩散.

结论:

D6PK的S-化是其与血膜稳定的关联的一个关键决定因素.
酸化起到调节开关的作用,控制D6PK与等离子体膜的动态相互作用及其极地定位.
这些发现揭示了控制酶介导辅酶运输和植物发育的新型调节途径.

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