Identification of CSPα clients reveals a role in dynamin 1 regulation.
Identification of CSPα clients reveals a role in dynamin 1 regulation.
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DOI:
10.1016/j.neuron.2012.01.029
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发表时间:
2012-04-12
期刊:
影响因子:
16.2
通讯作者:
Chandra SS
中科院分区:
文献类型:
--
作者:
Zhang YQ;Henderson MX;Colangelo CM;Ginsberg SD;Bruce C;Wu T;Chandra SS
Cysteine string protein α (CSPα), a presynaptic co-chaperone for Hsc70, is required for synapse maintenance. Deletion of CSPα leads to neuronal dysfunction, synapse loss, and neurodegeneration. We utilized unbiased, systematic proteomics to identify putative CSPα protein clients. We found 22 such proteins whose levels are selectively decreased in CSPα knockout synapses. Of these putative CSPα protein clients, two directly bind to the CSPα chaperone complex and are bona fide clients. They are the t-SNARE SNAP-25 and the GTPase dynamin 1, which are necessary for synaptic vesicle fusion and fission, respectively. Using hippocampal cultures, we show CSPα regulates the stability of client proteins and synaptic vesicle number. Our analysis of CSPα-dynamin 1 interactions reveals unexpectedly that CSPα regulates the polymerization of dynamin 1. CSPα therefore participates in synaptic vesicle endocytosis and may facilitate exo- and endocytic coupling. These findings advance the understanding of how synapses are functionally and structurally maintained.
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