Control of synaptic vesicle release probability via VAMP4 targeting to endolysosomes.
Control of synaptic vesicle release probability via VAMP4 targeting to endolysosomes.
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DOI:
10.1126/sciadv.abf3873
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发表时间:
2021-04
期刊:
影响因子:
13.6
通讯作者:
Cousin MA
中科院分区:
文献类型:
--
作者:
Ivanova D;Dobson KL;Gajbhiye A;Davenport EC;Hacker D;Ultanir SK;Trost M;Cousin MA
VAMP4 is a molecular rheostat that adjusts neurotransmitter release to both the activity and degradative status of neurons. Synaptic vesicle (SV) release probability (Pr), determines the steady state and plastic control of neurotransmitter release. However, how diversity in SV composition arises and regulates the Pr of individual SVs is not understood. We found that modulation of the copy number of the noncanonical vesicular SNARE (soluble N-ethylmaleimide–sensitive factor attachment protein receptor), vesicle-associated membrane protein 4 (VAMP4), on SVs is key for regulating Pr. Mechanistically, this is underpinned by its reduced ability to form an efficient SNARE complex with canonical plasma membrane SNAREs. VAMP4 has unusually high synaptic turnover and is selectively sorted to endolysosomes during activity-dependent bulk endocytosis. Disruption of endolysosomal trafficking and function markedly increased the abundance of VAMP4 in the SV pool and inhibited SV fusion. Together, our results unravel a new mechanism for generating SV heterogeneity and control of Pr through coupling of SV recycling to a major clearing system that regulates protein homeostasis.
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