Role of the synaptobrevin C terminus in fusion pore formation
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Role of the synaptobrevin C terminus in fusion pore formation. / Ngatchou, Annita N; Kisler, Kassandra; Fang, Qinghua; Walter, Alexander M; Zhao, Ying; Bruns, Dieter; Sørensen, Jakob B; Lindau, Manfred.
In: Proceedings of the National Academy of Science of the United States of America, 2010.Research output: Contribution to journal › Journal article › Research › peer-review
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T1 - Role of the synaptobrevin C terminus in fusion pore formation
AU - Ngatchou, Annita N
AU - Kisler, Kassandra
AU - Fang, Qinghua
AU - Walter, Alexander M
AU - Zhao, Ying
AU - Bruns, Dieter
AU - Sørensen, Jakob B
AU - Lindau, Manfred
PY - 2010
Y1 - 2010
N2 - Neurotransmitter release is mediated by the SNARE proteins synaptobrevin II (sybII, also known as VAMP2), syntaxin, and SNAP-25, generating a force transfer to the membranes and inducing fusion pore formation. However, the molecular mechanism by which this force leads to opening of a fusion pore remains elusive. Here we show that the ability of sybII to support exocytosis is inhibited by addition of one or two residues to the sybII C terminus depending on their energy of transfer from water to the membrane interface, following a Boltzmann distribution. These results suggest that following stimulation, the SNARE complex pulls the C terminus of sybII deeper into the vesicle membrane. We propose that this movement disrupts the vesicular membrane continuity leading to fusion pore formation. In contrast to current models, the experiments suggest that fusion pore formation begins with molecular rearrangements at the intravesicular membrane leaflet and not between the apposed cytoplasmic leaflets.
AB - Neurotransmitter release is mediated by the SNARE proteins synaptobrevin II (sybII, also known as VAMP2), syntaxin, and SNAP-25, generating a force transfer to the membranes and inducing fusion pore formation. However, the molecular mechanism by which this force leads to opening of a fusion pore remains elusive. Here we show that the ability of sybII to support exocytosis is inhibited by addition of one or two residues to the sybII C terminus depending on their energy of transfer from water to the membrane interface, following a Boltzmann distribution. These results suggest that following stimulation, the SNARE complex pulls the C terminus of sybII deeper into the vesicle membrane. We propose that this movement disrupts the vesicular membrane continuity leading to fusion pore formation. In contrast to current models, the experiments suggest that fusion pore formation begins with molecular rearrangements at the intravesicular membrane leaflet and not between the apposed cytoplasmic leaflets.
U2 - 10.1073/pnas.1006727107
DO - 10.1073/pnas.1006727107
M3 - Journal article
C2 - 20937897
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
ER -
ID: 22502289