Phosphorylation-dependent recognition of diverse protein targets by the cryptic GK domain of MAGI MAGUKs.

Phosphorylation-dependent recognition of diverse protein targets by the cryptic GK domain of MAGI MAGUKs.
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DOI:
10.1126/sciadv.adf3295
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发表时间:
2023-05-10
期刊:
影响因子:
13.6
通讯作者:
Zhu, Jinwei
Zhu, Jinwei
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Zhang, Meng;Cao, Aili;Lin, Lin;Chen, Ying;Shang, Yuan;Wang, Chao;Zhang, Mingjie;Zhu, Jinwei

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动态信号转导需要信号复合物的快速组装和拆卸,通常由磷蛋白结合模块介导。膜相关鸟苷酸激酶(MAGUKs)的鸟苷酸激酶样(GK)结构域是在细胞连接处协调信号传导的模块。MAGUKs的MAGI亚家族包含结构和功能未知的截短GK结构域,尽管它们参与多种生理和病理过程。在这里,我们证明了MAGI 2的截短GK结构域与其相邻的PDZ 0结构域相互作用,形成一个能够识别磷蛋白的结构超模块。一个保守的磷酸化依赖性结合基序PDZ 0-GK划定,这导致一组以前未知的结合伙伴的识别。我们探索的结构和功能的MAGI 2的目标复合物与抑制肽来自共识基序。我们的工作揭示了一个神秘的MAGI GK的作用机制,并扩大了我们的理解磷蛋白结合模块的目标识别规则。MAGI MAGUKs的隐蔽GK结构域的磷酸化依赖性靶识别模式的结构和功能分析。
Dynamic signal transduction requires the rapid assembly and disassembly of signaling complexes, often mediated by phosphoprotein binding modules. The guanylate kinase-like (GK) domain of the membrane-associated guanylate kinases (MAGUKs) is such a module orchestrating signaling at cellular junctions. The MAGI subfamily of MAGUKs contains a truncated GK domain with unknown structure and function, although they participate in diverse physiological and pathological processes. Here, we demonstrate that the truncated GK domain of MAGI2 interacts with its adjacent PDZ0 domain to form a structural supramodule capable of recognizing phosphoproteins. A conserved phosphorylation-dependent binding motif for PDZ0-GK is delineated, which leads to identification of a set of previously unknown binding partners. We explore the structure and function of the MAGI2-target complex with an inhibitory peptide derived from the consensus motif. Our work reveals an action mechanism of the cryptic MAGI GKs and broadens our understanding of the target recognition rules of phosphoprotein binding modules. Structural and functional analyses of phosphorylation-dependent target recognition mode of the cryptic GK domain of MAGI MAGUKs.
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