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Videos de Conceptos Relacionados

SNAREs and Membrane Fusion01:43

SNAREs and Membrane Fusion

Once a transport vesicle has recognized its target organelle, the vesicular membrane needs to fuse with the target membrane to unload the cargo. Transmembrane proteins called SNAREs present on organelle membranes and their vesicles, mediate vesicle fusion.
SNAREs exist in pairs that symmetrically interact and catalyze the fusion of the lipid bilayers in vesicle and target organelle. v-SNARE in the vesicle membrane are single polypeptide chains that bind to a complementary t-SNARE, composed of 2...
Fusion of Secretory Vesicles with the Plasma Membrane01:26

Fusion of Secretory Vesicles with the Plasma Membrane

Proteins and neurotransmitters in secretory vesicles can be released from a cell upon vesicle docking, priming, and fusion with the plasma membrane. Vesicles are docked and primed in preparation for the quick exocytosis of their contents in response to a stimulus. The fusion process is mainly carried out by a SNAP Receptor or SNARE complex, consisting of synaptobrevin, syntaxin-1, and SNAP-25.
In 1993, Jim Rothman proposed that the antiparallel pairing of vesicular and transmembrane SNAREs, or...
ATP Synthase: Structure01:18

ATP Synthase: Structure

ATP synthase or ATPase is among the most conserved proteins found in bacteria, mammals, and plants. This enzyme can catalyze a forward reaction in response to the electrochemical gradient, producing ATP from ADP and inorganic phosphate. ATP synthase can also work in a reverse direction by hydrolyzing ATP and generating an electrochemical gradient. Different forms of ATP synthases have evolved special features to meet the specific demands of the cell. Based on their specific feature, ATP...
Tagging and Fusion Proteins01:24

Tagging and Fusion Proteins

Proteins are involved in several cellular processes and biochemical reactions. Analyzing a specific protein of interest requires it to be isolated from the other proteins in the cell. This is achieved by overexpressing the specific gene in a suitable host to produce large quantities of the target protein. A tag or label is recombined with the gene to produce a fusion protein containing the target protein and the tag. The tags on these fusion proteins can then be used for easy detection and...
Mechanism of Filopodia Formation01:39

Mechanism of Filopodia Formation

Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
Rab Cascades01:25

Rab Cascades

Rab GTPases act in a regulated cascade during membrane fusion, helping the lipid bilayers mix. The Rab family of proteins are active when bound to GTP, and inactive when bound to GDP. Hence, they act as guanine nucleotide-dependent molecular switches. Rab-GTP recognizes and binds to long or short-range tethering proteins to capture the target vesicle. These tethers coordinate with SNAREs on the vesicle and the target membrane to assemble the trans SNARE complex that locks the mixing bilayers.

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Video Experimental Relacionado

Updated: Jul 15, 2026

SNARE-mediated Fusion of Single Proteoliposomes with Tethered Supported Bilayers in a Microfluidic Flow Cell Monitored by Polarized TIRF Microscopy
10:58

SNARE-mediated Fusion of Single Proteoliposomes with Tethered Supported Bilayers in a Microfluidic Flow Cell Monitored by Polarized TIRF Microscopy

Published on: August 24, 2016

Cómo la sinaptotagmina promueve la fusión de membranas.

Sascha Martens1, Michael M Kozlov, Harvey T McMahon

  • 1Medical Research Council-Laboratory of Molecular Biology, Hills Road, CB2 0QH Cambridge, UK.

Science (New York, N.Y.)
|May 5, 2007
PubMed
Resumen

La sinaptotagmina-1, un sensor de calcio, reduce la barrera energética para la fusión de la membrana. Promueve la exocitosis vesicular mediada por SNARE al inducir la curvatura de la membrana sobre la unión del calcio.

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Analysis of SNARE-mediated Membrane Fusion Using an Enzymatic Cell Fusion Assay
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Videos de Experimentos Relacionados

Last Updated: Jul 15, 2026

SNARE-mediated Fusion of Single Proteoliposomes with Tethered Supported Bilayers in a Microfluidic Flow Cell Monitored by Polarized TIRF Microscopy
10:58

SNARE-mediated Fusion of Single Proteoliposomes with Tethered Supported Bilayers in a Microfluidic Flow Cell Monitored by Polarized TIRF Microscopy

Published on: August 24, 2016

Analysis of SNARE-mediated Membrane Fusion Using an Enzymatic Cell Fusion Assay
09:19

Analysis of SNARE-mediated Membrane Fusion Using an Enzymatic Cell Fusion Assay

Published on: October 19, 2012

Visualizing Intracellular SNARE Trafficking by Fluorescence Lifetime Imaging Microscopy
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Área de la Ciencia:

  • Biología Molecular Biología Molecular
  • La neurociencia es la neurociencia.
  • La biofísica es la biofísica.

Sus antecedentes:

  • La liberación de neurotransmisores se basa en la exocitosis de las vesículas sinápticas, un proceso regulado por las proteínas solubles del receptor de la proteína de unión del factor sensible a la N-etilmaleimida (SNARE).
  • El influjo rápido de iones de calcio (Ca2+) desencadena la exocitosis, con la sinaptotagmina-1 identificada como el sensor crítico de Ca2+ para la fusión rápida de las vesículas.
  • La fusión por membrana, particularmente la fusión entre dos capas, se enfrenta a una barrera sustancial de energía de activación (aprox. 40 k{\displaystyle 40k{\mathrm {B} ^{\mathrm {B} ^{\mathrm {B} ^{\mathrm {B} ^{\mathrm {B} ^{\mathrm {B} ^{\mathrm {B} ^{\mathrm {B} ^{\mathrm {B} ^{\mathrm {B} ^{\mathrm {B} ^{\mathrm {B} ^{\mathrm {B} ^{\mathrm {B} ^{\mathrm {B} ^{\mathrm {B} ^{\mathrm {B} ^{\mathrm {B} ^{\mathrm {B} ^{\mathrm {B} ^{\mathrm {B} ^{\mathrm {B} ^{\mathrm {B} ^{\mathrm {B} ^{\mathrm }

Objetivo del estudio:

  • Para dilucidar el mecanismo por el cual la sinaptotagmina-1 facilita la fusión de membranas mediada por SNARE.
  • Investigar cómo la sinaptotagmina-1 supera la barrera de alta energía de activación para la fusión vesicular.

Principales métodos:

  • Investigó el papel del dominio C2 de la sinaptotagmina-1 en la interacción y fusión de la membrana.
  • Se analizaron los efectos biofísicos de la unión de Ca2+ a la sinaptotagmina-1 en la curvatura de la membrana y la función del complejo SNARE.

Principales resultados:

  • La unión de Ca2+ a la sinaptotagmina-1 induce una alta curvatura positiva en las membranas objetivo a través de la inserción en el dominio C2.
  • Esta curvatura inducida de la membrana reduce significativamente la energía de activación para la fusión entre dos capas.
  • La sinaptotagmina-1 desencadena la fusión de las vesículas acopladas a través de la curvatura de la membrana plasmática dependiente de Ca2+ y la cremallera del complejo SNARE.

Conclusiones:

  • La sinaptotagmina-1 actúa como un regulador crucial de la fusión de la membrana al reducir activamente el panorama energético.
  • El mecanismo implica la deformación de la membrana desencadenada por Ca2+, lo que facilita la fusión impulsada por SNARE.
  • Este mecanismo de curvatura de membrana y cierre cerrado de SNARE dependiente de Ca2+ puede representar una vía conservada para eventos de fusión de membrana.