Research output: Contribution to journal › Article › peer-review
Intersectin associates with synapsin and regulates its nanoscale localization and function. / Gerth, Fabian; Jäpel, Maria; Pechstein, Arndt; Kochlamazashvili, Gaga; Lehmann, Martin; Puchkov, Dmytro; Onofri, Franco; Benfenati, Fabio; Nikonenko, Alexander G.; Fredrich, Kristin; Shupliakov, Oleg; Maritzen, Tanja; Freund, Christian; Haucke, Volker.
In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 114, No. 45, 07.11.2017, p. 12057-12062.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Intersectin associates with synapsin and regulates its nanoscale localization and function
AU - Gerth, Fabian
AU - Jäpel, Maria
AU - Pechstein, Arndt
AU - Kochlamazashvili, Gaga
AU - Lehmann, Martin
AU - Puchkov, Dmytro
AU - Onofri, Franco
AU - Benfenati, Fabio
AU - Nikonenko, Alexander G.
AU - Fredrich, Kristin
AU - Shupliakov, Oleg
AU - Maritzen, Tanja
AU - Freund, Christian
AU - Haucke, Volker
PY - 2017/11/7
Y1 - 2017/11/7
N2 - Neurotransmission is mediated by the exocytic release of neurotransmitters 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.
AB - Neurotransmission is mediated by the exocytic release of neurotransmitters 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.
KW - Intramolecular regulation
KW - Multidomain scaffold
KW - Neurotransmission
KW - NMR spectroscopy
KW - Synaptic vesicles
UR - http://www.scopus.com/inward/record.url?scp=85033469426&partnerID=8YFLogxK
U2 - 10.1073/pnas.1715341114
DO - 10.1073/pnas.1715341114
M3 - Article
C2 - 29078407
AN - SCOPUS:85033469426
VL - 114
SP - 12057
EP - 12062
JO - Proceedings of the National Academy of Sciences of the United States of America
JF - Proceedings of the National Academy of Sciences of the United States of America
SN - 0027-8424
IS - 45
ER -
ID: 16798214