Activity-dependent facilitation of Synaptojanin and synaptic vesicle recycling by the Minibrain kinase

Chun-Kan Chen, Catherine Bregere, Jeremy Paluch, Jason F. Lu, Dion K. Dickman and Karen T. Chang ()
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Chun-Kan Chen: Zilkha Neurogenetic Institute, Keck School of Medicine, University of Southern California
Catherine Bregere: Zilkha Neurogenetic Institute, Keck School of Medicine, University of Southern California
Jeremy Paluch: University of Southern California
Jason F. Lu: Zilkha Neurogenetic Institute, Keck School of Medicine, University of Southern California
Dion K. Dickman: University of Southern California
Karen T. Chang: Zilkha Neurogenetic Institute, Keck School of Medicine, University of Southern California

Nature Communications, 2014, vol. 5, issue 1, 1-14

Abstract: Abstract Phosphorylation has emerged as a crucial regulatory mechanism in the nervous system to integrate the dynamic signalling required for proper synaptic development, function and plasticity, particularly during changes in neuronal activity. Here we present evidence that Minibrain (Mnb; also known as Dyrk1A), a serine/threonine kinase implicated in autism spectrum disorder and Down syndrome, is required presynaptically for normal synaptic growth and rapid synaptic vesicle endocytosis at the Drosophila neuromuscular junction (NMJ). We find that Mnb-dependent phosphorylation of Synaptojanin (Synj) is required, in vivo, for complex endocytic protein interactions and to enhance Synj activity. Neuronal stimulation drives Mnb mobilization to endocytic zones and triggers Mnb-dependent phosphorylation of Synj. Our data identify Mnb as a synaptic kinase that promotes efficient synaptic vesicle recycling by dynamically calibrating Synj function at the Drosophila NMJ, and in turn endocytic capacity, to adapt to conditions of high synaptic activity.

Date: 2014
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DOI: 10.1038/ncomms5246

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