Mindbomb 1, an E3 ubiquitin ligase, forms a complex with RYK to activate Wnt/β-catenin signaling.

Mindbomb 1, an E3 ubiquitin ligase, forms a complex with RYK to activate Wnt/β-catenin signaling.
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DOI:
10.1083/jcb.201107021
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发表时间:
2011-09-05
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Moon RT
Moon RT
中科院分区:
其他
文献类型:
--
作者:
Berndt JD;Aoyagi A;Yang P;Anastas JN;Tang L;Moon RT

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MIB 1泛素连接酶介导的Wnt受体RYK内化调节是细胞培养物中对Wnt 3a配体的应答所必需的,而C.优雅的受体样酪氨酸激酶(RYK)作为分泌蛋白配体的Wnt家族的跨膜受体起作用。虽然RYK经历内吞反应Wnt,调节其内在化和伴随的Wnt信号转导激活的机制是未知的。我们发现RYK在物理和功能上都与E3泛素连接酶Mindbomb 1(MIB 1)相互作用。MIB 1的过表达促进RYK的泛素化,并降低其在质膜上的稳态水平。此外,我们发现MIB 1足以激活Wnt/β-catenin(CTNNB 1)信号传导,并且这种活性依赖于内源性RYK。相反,在功能丧失研究中,RYK和MIB 1都是Wnt-3A介导的CTNNB 1激活所必需的。最后,我们确定了秀丽隐杆线虫直系同源物的MIB 1,并证明了遗传之间的相互作用ceMIB和lin-18/RYK外阴发育。这些发现提供了对Wnt/RYK信号传导机制的深入了解,并指出了Wnt信号传导调节的新靶点。
MIB1 ubiquitin ligase–mediated regulation of internalization of the Wnt receptor RYK is necessary for response to Wnt3a ligand in cell culture and C. elegans. Receptor-like tyrosine kinase (RYK) functions as a transmembrane receptor for the Wnt family of secreted protein ligands. Although RYK undergoes endocytosis in response to Wnt, the mechanisms that regulate its internalization and concomitant activation of Wnt signaling are unknown. We discovered that RYK both physically and functionally interacts with the E3 ubiquitin ligase Mindbomb 1 (MIB1). Overexpression of MIB1 promotes the ubiquitination of RYK and reduces its steady-state levels at the plasma membrane. Moreover, we show that MIB1 is sufficient to activate Wnt/β-catenin (CTNNB1) signaling and that this activity depends on endogenous RYK. Conversely, in loss-of-function studies, both RYK and MIB1 are required for Wnt-3A–mediated activation of CTNNB1. Finally, we identify the Caenorhabditis elegans orthologue of MIB1 and demonstrate a genetic interaction between ceMIB and lin-18/RYK in vulva development. These findings provide insights into the mechanisms of Wnt/RYK signaling and point to novel targets for the modulation of Wnt signaling.
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