POD1-SUN-CRT3 chaperone complex guards the ER sorting of LRR receptor kinases in Arabidopsis.

POD1-SUN-CRT3 chaperone complex guards the ER sorting of LRR receptor kinases in Arabidopsis.
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POD1-SUN-CRT3 伴侣复合物保护拟南芥中 LRR 受体激酶的 ER 分选

DOI:
10.1038/s41467-022-30179-w
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发表时间:
2022-05-16
影响因子:
16.6
通讯作者:
Yang WC
Yang WC
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Xue Y;Meng JG;Jia PF;Zhang ZR;Li HJ;Yang WC

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分泌途径中的蛋白质分选对于真核细胞中的细胞区室化和稳态是必不可少的。内质网(ER)是分泌性货物蛋白的生物合成和折叠工厂。从ER到高尔基体的货物运输是高度选择性的,但分选特异性的分子机制尚不清楚。在这里,我们报告了三个ER膜定位蛋白,SUN 3,SUN 4和SUN 5,调节ER分选富含亮氨酸的重复受体激酶(LRR-RKs)的质膜。三重突变体sun 3/4/5显示这些货物蛋白的错误分选到酸性隔室,因此损害花粉管和整个植物的生长。此外,LRR-RKs的胞外LRR结构域负责正确分选。总之,这项研究报告了一种对细胞表面受体分选很重要的机制。从ER到高尔基体的货物运输是高度选择性的。在这里,作者确定了三个分泌途径定位的蛋白质,调节ER分选的受体激酶在拟南芥和所需的支持花粉管生长。
Protein sorting in the secretory pathway is essential for cellular compartmentalization and homeostasis in eukaryotic cells. The endoplasmic reticulum (ER) is the biosynthetic and folding factory of secretory cargo proteins. The cargo transport from the ER to the Golgi is highly selective, but the molecular mechanism for the sorting specificity is unclear. Here, we report that three ER membrane localized proteins, SUN3, SUN4 and SUN5, regulate ER sorting of leucine-rich repeat receptor kinases (LRR-RKs) to the plasma membrane. The triple mutant sun3/4/5 displays mis-sorting of these cargo proteins to acidic compartments and therefore impairs the growth of pollen tubes and the whole plant. Furthermore, the extracellular LRR domain of LRR-RKs is responsible for the correct sorting. Together, this study reports a mechanism that is important for the sorting of cell surface receptors. Cargo transport from the ER to the Golgi is highly selective. Here the authors identify three secretory pathway localized proteins that regulate ER sorting of receptor kinases in Arabidopsis and are required to support pollen tube growth.
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