Synaptobrevin-2 C-Terminal Flexible Region Regulates the Discharge of Catecholamine Molecules
The discharge of neurotransmitters from vesicles is a regulated process. Synaptobrevin-2, a snap receptor (SNARE) protein, participates in this process by interacting with other SNARE and associated proteins. Synaptobrevin-2 transmembrane domain is embedded into the vesicle lipid bilayer except for...
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| Published in | Biophysical journal Vol. 116; no. 5; pp. 921 - 929 |
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| Main Author | |
| Format | Journal Article |
| Language | English |
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United States
Elsevier Inc
05.03.2019
The Biophysical Society |
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| Abstract | The discharge of neurotransmitters from vesicles is a regulated process. Synaptobrevin-2, a snap receptor (SNARE) protein, participates in this process by interacting with other SNARE and associated proteins. Synaptobrevin-2 transmembrane domain is embedded into the vesicle lipid bilayer except for its last three residues. These residues are hydrophilic and constitute synaptobrevin-2 C-terminal flexible region. The residue Y113 of synaptobrevin-2 flexible region was mutated to lysine and glutamate. The effects of these mutations on the exocytotic process in chromaffin cells were assessed using capacitance measurements combined with amperometry and stimulation by flash photolysis of caged Ca2+. Both Y113E and Y113K mutations reduced the number of fusion-competent vesicles and reduced the rates of release of catecholamine molecules in quanta release events. These results exclude any direct interaction of this domain with the catecholamine molecules that are escaping through the fusion pore but favor its interaction with the vesicle membrane as a mean of regulating exocytosis. |
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| AbstractList | The discharge of neurotransmitters from vesicles is a regulated process. Synaptobrevin-2, a snap receptor (SNARE) protein, participates in this process by interacting with other SNARE and associated proteins. Synaptobrevin-2 transmembrane domain is embedded into the vesicle lipid bilayer except for its last three residues. These residues are hydrophilic and constitute synaptobrevin-2 C-terminal flexible region. The residue Y113 of synaptobrevin-2 flexible region was mutated to lysine and glutamate. The effects of these mutations on the exocytotic process in chromaffin cells were assessed using capacitance measurements combined with amperometry and stimulation by flash photolysis of caged Ca2+. Both Y113E and Y113K mutations reduced the number of fusion-competent vesicles and reduced the rates of release of catecholamine molecules in quanta release events. These results exclude any direct interaction of this domain with the catecholamine molecules that are escaping through the fusion pore but favor its interaction with the vesicle membrane as a mean of regulating exocytosis. The discharge of neurotransmitters from vesicles is a regulated process. Synaptobrevin-2, a snap receptor (SNARE) protein, participates in this process by interacting with other SNARE and associated proteins. Synaptobrevin-2 transmembrane domain is embedded into the vesicle lipid bilayer except for its last three residues. These residues are hydrophilic and constitute synaptobrevin-2 C-terminal flexible region. The residue Y113 of synaptobrevin-2 flexible region was mutated to lysine and glutamate. The effects of these mutations on the exocytotic process in chromaffin cells were assessed using capacitance measurements combined with amperometry and stimulation by flash photolysis of caged Ca . Both Y113E and Y113K mutations reduced the number of fusion-competent vesicles and reduced the rates of release of catecholamine molecules in quanta release events. These results exclude any direct interaction of this domain with the catecholamine molecules that are escaping through the fusion pore but favor its interaction with the vesicle membrane as a mean of regulating exocytosis. The discharge of neurotransmitters from vesicles is a regulated process. Synaptobrevin-2, a snap receptor (SNARE) protein, participates in this process by interacting with other SNARE and associated proteins. Synaptobrevin-2 transmembrane domain is embedded into the vesicle lipid bilayer except for its last three residues. These residues are hydrophilic and constitute synaptobrevin-2 C-terminal flexible region. The residue Y113 of synaptobrevin-2 flexible region was mutated to lysine and glutamate. The effects of these mutations on the exocytotic process in chromaffin cells were assessed using capacitance measurements combined with amperometry and stimulation by flash photolysis of caged Ca 2+ . Both Y113E and Y113K mutations reduced the number of fusion-competent vesicles and reduced the rates of release of catecholamine molecules in quanta release events. These results exclude any direct interaction of this domain with the catecholamine molecules that are escaping through the fusion pore but favor its interaction with the vesicle membrane as a mean of regulating exocytosis. |
| Author | Weiss, Annita N. |
| AuthorAffiliation | 1 Laboratory for Nanoscale Cell Biology, Max-Planck-Institute for Biophysical Chemistry, Göttingen, Germany |
| AuthorAffiliation_xml | – name: 1 Laboratory for Nanoscale Cell Biology, Max-Planck-Institute for Biophysical Chemistry, Göttingen, Germany |
| Author_xml | – sequence: 1 givenname: Annita N. surname: Weiss fullname: Weiss, Annita N. email: angatch@gwdg.de organization: Laboratory for Nanoscale Cell Biology, Max-Planck-Institute for Biophysical Chemistry, Göttingen, Germany |
| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/30795871$$D View this record in MEDLINE/PubMed |
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| CitedBy_id | crossref_primary_10_3389_fcell_2020_609708 crossref_primary_10_1016_j_coelec_2021_100751 crossref_primary_10_1016_j_bpj_2022_09_029 crossref_primary_10_3389_fnmol_2022_948160 |
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