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Synaptic vesicle proteins under conditions of rest and activation: Analysis by 2‐D difference gel electrophoresis
Author(s) -
Burré Jacqueline,
Beckhaus Tobias,
Corvey Carsten,
Karas Michael,
Zimmermann Herbert,
Volknandt Walter
Publication year - 2006
Publication title -
electrophoresis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.666
H-Index - 158
eISSN - 1522-2683
pISSN - 0173-0835
DOI - 10.1002/elps.200500864
Subject(s) - synaptic vesicle , exocytosis , vesicle fusion , depolarization , vesicle , kiss and run fusion , snap25 , chemistry , synaptotagmin 1 , microbiology and biotechnology , rab , western blot , biology , biochemistry , secretion , biophysics , membrane , gtpase , gene
Synaptic vesicles are organelles of the nerve terminal that secrete neurotransmitters by fusion with the presynaptic plasma membrane. Vesicle fusion is tightly controlled by depolarization of the plasma membrane and a set of proteins that may undergo post‐translational modifications such as phosphorylation. In order to identify proteins that undergo modifications as a result of synaptic activation, we induced massive exocytosis and analysed the synaptic vesicle compartment by benzyldimethyl‐ n ‐hexadecylammonium chloride (BAC)/SDS‐PAGE and difference gel electrophoresis (DIGE) followed by MALDI‐TOF‐MS. We identified eight proteins that revealed significant changes in abundance following nerve terminal depolarization. Of these, six were increased and two were decreased in abundance. Three of these proteins were phosphorylated as detected by Western blot analysis. In addition, we identified an unknown synaptic vesicle protein whose abundance increased on synaptic activation. Our results demonstrate that depolarization of the presynaptic compartment induces changes in the abundance of synaptic vesicle proteins and post‐translational protein modification.