期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 114, 期 45, 页码 12057-12062出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1715341114
关键词
neurotransmission; synaptic vesicles; multidomain scaffold; intramolecular regulation; NMR spectroscopy
资金
- German Research Foundation [SFB958/A07, SFB958/Z03, SFB958/A01]
- NeuroCure Cluster of Excellence [Exc-257]
- Telethon-Italy Grant [GGP13033]
- CARIPLO [2013-0879]
- Italian Ministry of Health [RF 2013]
- Russian Science Foundation [16-15-10273] Funding Source: Russian Science Foundation
Neurotransmission is mediated by the exocytic release of neuro-transmitters from readily releasable synaptic vesicles (SVs) at the active zone. To sustain neurotransmission during periods of elevated activity, release-ready vesicles need to be replenished from the reserve pool of SVs. The SV-associated synapsins are crucial for maintaining this reserve pool and regulate the mobilization of reserve pool SVs. How replenishment of release-ready SVs from the reserve pool is regulated and which other factors cooperate with synapsins in this process is unknown. Here we identify the endocytic multidomain scaffold protein intersectin as an important regulator of SV replenishment at hippocampal synapses. We found that intersectin directly associates with synapsin I through its Src-homology 3 A domain, and this association is regulated by an intramolecular switch within intersectin 1. Deletion of intersectin 1/2 in mice alters the presynaptic nanoscale distribution of synapsin I and causes defects in sustained neurotransmission due to defective SV replenishment. These phenotypes were rescued by wild-type intersectin 1 but not by a locked mutant of intersectin 1. Our data reveal intersectin as an autoinhibited scaffold that serves as a molecular linker between the synapsin-dependent reserve pool and the presynaptic endocytosis machinery.
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