Novel phospho-switch function of delta-catenin in dendrite development.

Novel phospho-switch function of delta-catenin in dendrite development.
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DOI:
10.1083/jcb.201909166
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发表时间:
2020-11-02
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
McCrea PD
McCrea PD
中科院分区:
其他
文献类型:
--
作者:
Baumert R;Ji H;Paulucci-Holthauzen A;Wolfe A;Sagum C;Hodgson L;Arikkath J;Chen X;Bedford MT;Waxham MN;McCrea PD

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Baumert et al. identify a novel “phospho-switch” within the neuronal protein delta-catenin. This phospho-switch, located at delta-catenin’s C-terminus, is sensitive to upstream glutamate signaling and instructs dendrites to branch versus extend during development by determining delta-catenin’s neuronal binding partners and subsequent modulation of actin-associated proteins. In neurons, dendrites form the major sites of information receipt and integration. It is thus vital that, during development, the dendritic arbor is adequately formed to enable proper neural circuit formation and function. While several known processes shape the arbor, little is known of those that govern dendrite branching versus extension. Here, we report a new mechanism instructing dendrites to branch versus extend. In it, glutamate signaling activates mGluR5 receptors to promote Ckd5-mediated phosphorylation of the C-terminal PDZ-binding motif of delta-catenin. The phosphorylation state of this motif determines delta-catenin’s ability to bind either Pdlim5 or Magi1. Whereas the delta:Pdlim5 complex enhances dendrite branching at the expense of elongation, the delta:Magi1 complex instead promotes lengthening. Our data suggest that these complexes affect dendrite development by differentially regulating the small-GTPase RhoA and actin-associated protein Cortactin. We thus reveal a “phospho-switch” within delta-catenin, subject to a glutamate-mediated signaling pathway, that assists in balancing the branching versus extension of dendrites during neural development.
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