A continuum model of docking of synaptic vesicle to plasma membrane.
نویسندگان
چکیده
Neurotransmitter release from neuronal terminals is governed by synaptic vesicle fusion. Vesicles filled with transmitters are docked at the neuronal membrane by means of the SNARE machinery. After a series of events leading up to the fusion pore formation, neurotransmitters are released into the synaptic cleft. In this paper, we study the mechanics of the docking process. A continuum model is used to determine the deformation of a spherical vesicle and a plasma membrane, under the influence of SNARE-machinery forces and electrostatic repulsion. Our analysis provides information on the variation of in-plane stress in the membranes, which is known to affect fusion. Also, a simple model is proposed to study hemifusion.
منابع مشابه
Syntaxin 1 is expressed in the trout saccular hair cells: RT-PCR and immunocytochemical observations
Syntaxin is one of several proteins that may be involved in the docking of synaptic vesicles, synaptic vesicle recycling, and non-synaptic membrane trafficking. Presence of syntaxin has been reported in rat auditory and vestibular end organs. In the current study, we have examined the expression of message for syntaxin 1 in hair cells of the sacculus of the rainbow trout, Oncorhynchus mykiss, w...
متن کاملSyntaxin 1 is expressed in the trout saccular hair cells: RT-PCR and immunocytochemical observations
Syntaxin is one of several proteins that may be involved in the docking of synaptic vesicles, synaptic vesicle recycling, and non-synaptic membrane trafficking. Presence of syntaxin has been reported in rat auditory and vestibular end organs. In the current study, we have examined the expression of message for syntaxin 1 in hair cells of the sacculus of the rainbow trout, Oncorhynchus mykiss, w...
متن کاملCAPS and syntaxin dock dense core vesicles to the plasma membrane in neurons
Docking to the plasma membrane prepares vesicles for rapid release. Here, we describe a mechanism for dense core vesicle docking in neurons. In Caenorhabditis elegans motor neurons, dense core vesicles dock at the plasma membrane but are excluded from active zones at synapses. We have found that the calcium-activated protein for secretion (CAPS) protein is required for dense core vesicle dockin...
متن کاملSynaptic vesicle docking: a putative role for the Munc18/Sec1 protein family.
At presynaptic nerve terminals, neurotransmitter is stored in small membranebound organelles, termed ‘‘synaptic vesicles.’’ In order to release their contents into the synaptic cleft via membrane fusion, synaptic vesicles must first associate, or ‘‘dock,’’ with the plasma membrane. Recent data suggest that the cytoplasmic protein UNC-18 (a.k.a. nSec1/Munc18-1/rbsec-1 or Rop) promotes synaptic v...
متن کاملOpen Syntaxin Docks Synaptic Vesicles
Synaptic vesicles dock to the plasma membrane at synapses to facilitate rapid exocytosis. Docking was originally proposed to require the soluble N-ethylmaleimide-sensitive fusion attachment protein receptor (SNARE) proteins; however, perturbation studies suggested that docking was independent of the SNARE proteins. We now find that the SNARE protein syntaxin is required for docking of all vesic...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Journal of the Royal Society, Interface
دوره 12 102 شماره
صفحات -
تاریخ انتشار 2015