Journal
ELIFE
Volume 7, Issue -, Pages -Publisher
ELIFE SCIENCES PUBLICATIONS LTD
DOI: 10.7554/eLife.30457
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Funding
- National Natural Science Foundation of China [31430035, 31171041, 31401107]
- National Basic Research Program [2012CB517903]
- China Postdoctoral Science Foundation [2015T80476, 2014M560369]
- Canadian Institutes of Health Research [CCI117959]
- NSFC-CIHR [81161120543]
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Neuroligins are postsynaptic adhesion molecules that are essential for postsynaptic specialization and synaptic function. But the underlying molecular mechanisms of neuroligin functions remain unclear. We found that Drosophila Neuroligin 1 (DNIg1) regulates synaptic structure and function through WAVE regulatory complex (WRC)-mediated postsynaptic actin reorganization. The disruption of DNIg1, DNIg2, or their presynaptic partner neurexin (DNrx) led to a dramatic decrease in the amount of F-actin. Further study showed that DNIg1, but not DNIg2 or DNIg3, directly interacts with the WRC via its C-terminal interacting receptor sequence. That interaction is required to recruit WRC to the postsynaptic membrane to promote F-actin assembly. Furthermore, the interaction between DNIg1 and the WRC is essential for DNIg1 to rescue the morphological and electrophysiological defects in dnlgl mutants. Our results reveal a novel mechanism by which the DNrx-DNIg1 trans-synaptic interaction coordinates structural and functional properties at the neuromuscular junction.
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