Phosphorylation-dependent ubiquitination of paraxial protocadherin (PAPC) controls gastrulation cell movements.

Phosphorylation-dependent ubiquitination of paraxial protocadherin (PAPC) controls gastrulation cell movements.
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DOI:
10.1371/journal.pone.0115111
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发表时间:
2015
期刊:
影响因子:
3.7
通讯作者:
Kinoshita N
Kinoshita N
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Kai M;Ueno N;Kinoshita N

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旁轴原钙粘蛋白(Paraxial protocadherin, PAPC)在胚胎发生早期参与原肠形成细胞的运动。它首先在原肠胚早期的背缘区表达,随后局限于爪蟾和斑马鱼的近轴中胚层。利用爪蟾胚胎,我们发现PAPC也在蛋白水平上受到调控,并在原胚后期被降解并从轴向中胚层的质膜中排除。调控PAPC需要依赖于磷酸化的多泛素化。在进化上保守的细胞质区域,PAPC被GKS3磷酸化,这反过来是E3泛素连接酶β-TrCP的多泛素化所必需的。我们还表明,通过磷酸化/泛素化精确控制PAPC对爪蟾原肠胚细胞的正常运动至关重要。综上所述,我们的发现揭示了一种新的细胞粘附蛋白调控机制,并表明该系统在脊椎动物胚胎发生中起着至关重要的作用。
Paraxial protocadherin (PAPC) has been shown to be involved in gastrulation cell movements during early embryogenesis. It is first expressed in the dorsal marginal zone at the early gastrula stage and subsequently restricted to the paraxial mesoderm in Xenopus and zebrafish. Using Xenopus embryos, we found that PAPC is also regulated at the protein level and is degraded and excluded from the plasma membrane in the axial mesoderm by the late gastrula stage. Regulation of PAPC requires poly-ubiquitination that is dependent on phosphorylation. PAPC is phosphorylated by GKS3 in the evolutionarily conserved cytoplasmic domain, and this in turn is necessary for poly-ubiquitination by an E3 ubiquitin ligase β-TrCP. We also show that precise control of PAPC by phosphorylation/ubiquitination is essential for normal Xenopus gastrulation cell movements. Taken together, our findings unveil a novel mechanism of regulation of a cell adhesion protein and show that this system plays a crucial role in vertebrate embryogenesis.
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