Differential requirements for the Eps15 homology domain proteins EHD4 and EHD2 in the regulation of mammalian ciliogenesis.

Differential requirements for the Eps15 homology domain proteins EHD4 and EHD2 in the regulation of mammalian ciliogenesis.
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哺乳动物纤毛发生调节中对Eps 15同源结构域蛋白EHD 4和EHD 2的不同需求。

DOI:
10.1111/tra.12845
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发表时间:
2022-07
期刊:
影响因子:
4.5
通讯作者:
Caplan, Steve
Caplan, Steve
中科院分区:
生物学2区
文献类型:
--
作者:
Jones, Tyler;Naslavsky, Naava;Caplan, Steve

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内吞蛋白EHD1通过促进纤毛小泡的融合和将CP110从母中心粒上移除来控制原发纤毛的发生。EHD3是最接近的EHD1同源基因,具有类似的调节作用,但初步证据表明,另外两个更远端的同源基因EHD2和EHD4对于纤毛的发生可能是必不可少的。在这里,我们定义了EHD4,而不是EHD2,在调节原发纤毛发生中的新角色。为了更好地了解EHD蛋白在纤毛发生中的机制和差异功能,我们首先证明了EHD1ATP结合促进纤毛发生的必要性。然后,我们鉴定了两个序列基序,它们在EHD1、EHD3和EHD4的EH结构域之间完全保守,但在EHD2的EH结构域中显示了关键的氨基酸差异。用EHD2中对齐的S451或W475残基替换EHD1中的P446或E470,足以防止在重新引入EHD1时挽救EHD1耗竭的细胞中的纤毛生成。总体而言,我们的数据加强了目前对EHD类似物在纤毛发生中的理解,证明了ATP结合的必要性,并在EHD1、EHD3和EHD4的EH结构域中发现了调节EHD1与蛋白质结合的保守序列,以及它拯救EHD1缺失细胞纤毛发生的能力。在这里,我们定义了EHD4而不是EHD2在调节原发纤毛发生中的新角色,并证明了EHD1ATP结合促进纤毛发生所必需的。总体而言,我们的数据加强了目前对EHD类似物在纤毛发生中的理解,证明了ATP结合的必要性,并在EHD1、EHD3和EHD4(但不是EHD2)的EH结构域中发现了调节EH结构域与蛋白质结合的保守序列,并赋予EHD1拯救EHD1缺失细胞中纤毛发生的能力。
The endocytic protein EHD1 controls primary ciliogenesis by facilitating fusion of the ciliary vesicle and by removal of CP110 from the mother centriole. EHD3, the closest EHD1 paralog, has a similar regulatory role, but initial evidence suggested that the other two more distal paralogs, EHD2 and EHD4 may be dispensable for ciliogenesis. Herein, we define a novel role for EHD4, but not EHD2, in regulating primary ciliogenesis. To better understand the mechanisms and differential functions of the EHD proteins in ciliogenesis, we first demonstrated a requirement for EHD1 ATP‐binding to promote ciliogenesis. We then identified two sequence motifs that are entirely conserved between EH domains of EHD1, EHD3 and EHD4, but display key amino acid differences within the EHD2 EH domain. Substitution of either P446 or E470 in EHD1 with the aligning S451 or W475 residues from EHD2 was sufficient to prevent rescue of ciliogenesis in EHD1‐depleted cells upon reintroduction of EHD1. Overall, our data enhance the current understanding of the EHD paralogs in ciliogenesis, demonstrate a need for ATP‐binding and identify conserved sequences in the EH domains of EHD1, EHD3 and EHD4 that regulate EHD1 binding to proteins and its ability to rescue ciliogenesis in EHD1‐depleted cells. Herein, we define a novel role for EHD4, but not EHD2, in regulating primary ciliogenesis, and demonstrate a requirement for EHD1 ATP‐binding to promote ciliogenesis. Overall, our data enhance the current understanding of the EHD paralogs in ciliogenesis, demonstrate a need for ATP‐binding, and identify conserved sequences in the EH domains of EHD1, EHD3 and EHD4 (but not EHD2) that regulate EH‐domain binding to proteins and bestow upon EHD1 the ability to rescue ciliogenesis in EHD1‐depleted cells.
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