Video Experimental Relacionado
Updated: May 5, 2026
10:30
A High-throughput-compatible FRET-based Platform for Identification and Characterization of Botulinum Neurotoxin Light Chain Modulators
Published on: December 27, 2013
5.0K
Bases estructurales para el reconocimiento de la proteína 2C de las vesículas sinápticas por la neurotoxina
Roger M Benoit1, Daniel Frey2, Manuel Hilbert2
1Laboratory of Biomolecular Research, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland.
Nature
|November 19, 2013
Resumen
La neurotoxina botulínica A (BoNT/A) se une a SV2C a través de su dominio de unión al receptor. Esta visión estructural de la interacción BoNT/A-SV2C ayuda en el desarrollo de nuevas antitoxinas y variantes de toxinas terapéuticas.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Biología Estructural Biología Estructural
- La neurociencia es la neurociencia.
Sus antecedentes:
- La neurotoxina botulínica A (BoNT/A) es una potente neurotoxina utilizada terapéuticamente para afecciones como las migrañas y aplicaciones cosméticas.
- BoNT / A funciona mediante la escisión de SNAP-25, inhibiendo la liberación de acetilcolina y causando parálisis muscular.
- Los receptores conocidos para BoNT/A incluyen gangliosidos, proteínas SV2 y potencialmente FGFR3.3.
Objetivo del estudio:
- Determinar la estructura cristalina de alta resolución del dominio de unión al receptor BoNT/A (BoNT/A-RBD) en complejo con el dominio luminal SV2C (SV2C-LD).
- Para dilucidar los detalles moleculares de la interacción entre BoNT/A y su receptor SV2C.
- Proporcionar una base estructural para el desarrollo de nuevos agentes antitoxínicos y terapias BoNT/A mejoradas.
Principales métodos:
- Determinación de la estructura cristalina de alta resolución del complejo BoNT/A-RBD/SV2C-LD.
- Análisis de las interacciones proteína-proteína utilizando métodos estructurales y bioquímicos.
- Experimentos de competencia para identificar péptidos inhibidores.
Principales resultados:
- La estructura cristalina reveló que SV2C-LD forma una hélice β cuadrilateral derecha.
- BoNT/A-RBD se asocia con SV2C-LD principalmente a través de interacciones espina dorsal a espina dorsal en los bordes abiertos de la hebra β.
- Se identificó un inhibidor peptídico de la formación del complejo BoNT/A-SV2C.
Conclusiones:
- El estudio proporciona los primeros conocimientos estructurales de alta resolución sobre la interacción del receptor BoNT/A-SV2C.
- Estos hallazgos ofrecen una base para el diseño de nuevas antitoxinas contra BoNT/A.
- Los datos estructurales pueden guiar el desarrollo de variantes de BoNT/A con aplicaciones terapéuticas mejoradas.
Videos de Conceptos Relacionados
01:33Overview of Secretory Vesicles
8.9K
Secretory vesicles, also known as dense core vesicles (DCVs), are membrane-bound vesicles that transport secretory proteins, such as hormones or neurotransmitters. Regulated secretory vesicles transport proteins from the trans-Golgi network to the exterior of the cell. Proteins present in regulated secretory vesicles are required to be rapidly exocytosed in large amounts upon a specific stimulus.
Various proteins regulate the aggregation of molecules inside the secretory vesicles. Chromogranins...
Various proteins regulate the aggregation of molecules inside the secretory vesicles. Chromogranins...
8.9K
01:26Fusion of Secretory Vesicles with the Plasma Membrane
16.0K
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...
In 1993, Jim Rothman proposed that the antiparallel pairing of vesicular and transmembrane SNAREs, or...
16.0K
01:26Chemical Synapses
9.5K
Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
9.5K
01:29Neuromuscular Junction And Blockade
5.9K
The site of chemical communication between a motor neuron and a muscle fiber is called the neuromuscular junction (NMJ). The end of the motor neuron at the NMJ divides into a cluster of synaptic end bulbs. The cytoplasm of these bulbs consists of synaptic vesicles enclosing acetylcholine molecules, the principal neurotransmitter released at the NMJ. The region opposite the synaptic bulb that ends in the muscle fiber is called the motor end plate, which has acetylcholine receptors. Within the...
5.9K
01:26Directly Acting Muscle Relaxants: Dantrolene and Botulinum Toxin
2.2K
Directly acting muscle relaxants like dantrolene and botulinum toxin (BoNT) have distinct mechanisms and applications. Dantrolene, a hydantoin derivative, acts on the ryanodine receptor (RYR1) in skeletal muscle cells. RYR1 are calcium channels present at the sarcoplasmic reticulum membrane. In response to excitation, they release calcium ions from the sarcoplasmic reticulum to the cytosol. Calcium promotes actin-myosin-mediated contraction of muscles.
The binding of dantrolene to the RYR1...
The binding of dantrolene to the RYR1...
2.2K
01:26Chemical Synapses
10.9K
Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
10.9K