对aPKC-Par6及其多位极性基质Lgl的捕获,相互抑制和释放机制
Christopher P Earl1, Mathias Cobbaut2,3, André Barros-Carvalho4,5
1Signalling and Structural Biology Laboratory, Francis Crick Institute, London, UK.
一个新的结构揭示了非典型的蛋白激酶C (aPKC) 和分区缺陷蛋白6 (Par6) 如何与致命的 (2) 巨型幼虫 (Lgl) 蛋白相互作用. 这种相互作用通过形成抑制酸化的稳定复合体来调节细胞极性.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 结构生物学是结构生物学.
背景情况:
- 非典型的蛋白激酶C (aPKC) 分割缺陷蛋白6 (Par6) 复合体对抗致命的 (2) 巨 (Lgl) 蛋白质.
- 这种相互作用对于在各种细胞类型中保持细胞极性至关重要.
- 该条例的确切机制,特别是Par6的作用,仍然不清楚.
研究的目的:
- 阐明aPKC-Par6-Lgl相互作用的结构基础.
- 了解这些蛋白质的相互调节和空间控制机制.
- 为了研究Par6在酶基质复合体中的作用.
主要方法:
- 通过X射线晶体学,确定人体aPKCι-Par6α与全长Lllgl1.gl1结合的结构.
- 位点定向的突变发生,以破坏特定的相互作用位点.
- 生物化学测试以评估酸化和复合稳定性.
主要成果:
- 该结构显示了一个稳定的复合体,由aPKCι对接点和Par6PDZ接触介导.
- 一种-S663 Llgl1中间体桥接aPKC和Par6,抑制进一步的酸化并形成基质捕获的中间体.
- 破坏Lgl-aPKC相互作用会损害复杂组合,而破坏Lgl-Par6PDZ相互作用会促进解离和酸化.
结论:
- 一个Par6PDZ调节的基质捕获释放模型解释了aPKC-Par6和Lgl.的相互调节.
- 复杂的拆解需要Cdc42结合和尖端蛋白质Crumbs.
- 这种机制提供了对细胞极性信号的空间控制.
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