Abstract:
:Assembly and maturation of synapses at the Drosophila neuromuscular junction (NMJ) depend on trans-synaptic neurexin/neuroligin signalling, which is promoted by the scaffolding protein Syd-1 binding to neurexin. Here we report that the scaffold protein spinophilin binds to the C-terminal portion of neurexin and is needed to limit neurexin/neuroligin signalling by acting antagonistic to Syd-1. Loss of presynaptic spinophilin results in the formation of excess, but atypically small active zones. Neuroligin-1/neurexin-1/Syd-1 levels are increased at spinophilin mutant NMJs, and removal of single copies of the neurexin-1, Syd-1 or neuroligin-1 genes suppresses the spinophilin-active zone phenotype. Evoked transmission is strongly reduced at spinophilin terminals, owing to a severely reduced release probability at individual active zones. We conclude that presynaptic spinophilin fine-tunes neurexin/neuroligin signalling to control active zone number and functionality, thereby optimizing them for action potential-induced exocytosis.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Muhammad K,Reddy-Alla S,Driller JH,Schreiner D,Rey U,Böhme MA,Hollmann C,Ramesh N,Depner H,Lützkendorf J,Matkovic T,Götz T,Bergeron DD,Schmoranzer J,Goettfert F,Holt M,Wahl MC,Hell SW,Scheiffele P,Walter AM,Loll Bdoi
10.1038/ncomms9362subject
Has Abstractpub_date
2015-10-16 00:00:00pages
8362issn
2041-1723pii
ncomms9362journal_volume
6pub_type
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