Video Experimental Relacionado
Updated: Jun 22, 2026

10:51
Visualization of Endosome Dynamics in Living Nerve Terminals with Four-dimensional Fluorescence Imaging
Published on: April 16, 2014
Estructura tridimensional de un dominio N-terminal evolucionariamente conservado de la sintaxina 1A
I Fernandez1, J Ubach, I Dulubova
1Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas 75235, USA.
Cell
|September 30, 1998
Resumen
La sintaxina 1A es una de ellas.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- Biología Molecular Biología Molecular
- Biología Estructural Biología estructural.
Sus antecedentes:
- La sintaxina 1A es crucial para la liberación de neurotransmisores.
- Participa en numerosas interacciones proteína-proteína.
- Comprender su estructura es clave para entender la exocitosis.
Objetivo del estudio:
- Para identificar y determinar la estructura 3D del dominio N-terminal de la sintaxina 1A.
- Para investigar la base estructural para el papel de la sintaxina 1A en la liberación de neurotransmisores.
Principales métodos:
- Se empleó la espectroscopia de resonancia magnética nuclear (RMN).
- Se analizó el dominio N-terminal autónomamente plegado de la sintaxina 1A.
Principales resultados:
- Se identificó un dominio N-terminal autónomamente plegado de la sintaxina 1A.
- Su estructura tridimensional, compuesta por tres hélices alfa, fue aclarada.
- Un surco conservado sugiere una superficie de interacción proteína-proteína específica.
- Se observó una interacción dependiente de Ca2+ con el dominio C2A de la sinaptotagmina I.
Conclusiones:
- El dominio N-terminal de la sintaxina 1A tiene una estructura específica y características conservadas.
- Este dominio probablemente media las interacciones específicas de proteínas esenciales para la exocitosis.
- Una interacción dependiente de Ca2+ con la sinaptotagmina I puede actuar como un interruptor electrostático en la liberación de neurotransmisores.
Videos de Conceptos Relacionados
Conservation of Protein Domains Over Different Proteins
Protein domains are small structurally independent units that are part of a single amino acid chain. Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to form...
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to form...
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...
In 1993, Jim Rothman proposed that the antiparallel pairing of vesicular and transmembrane SNAREs, or...
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...
Pinching-off of Coated Vesicles
Vesicle budding is orchestrated by distinct cytosolic proteins such as adaptor proteins, coat proteins, and GTPases. To initiate vesicle budding, membrane-bending proteins containing crescent-shaped BAR domains bind to the lipid heads in the bilayer and distort the membrane to form a protein-coated vesicle bud. Adaptors proteins such as AP2 for clathrin-coated vesicles can nucleate on the deformed membrane. Finally, coat proteins such as clathrin or COPI and COPII assemble into a coat forming...
Tail-anchoring of Proteins in the ER Membrane
Tail-anchored, or TA, proteins are estimated to make up to 3-5% of membrane proteins found in the eukaryotic cell. Such proteins have a single transmembrane domain located approximately 30 amino acid residues upstream from the C-terminal end. As a result, the signal recognition particle (SRP) cannot guide a TA protein to the ER membrane for cotranslational insertion. Hence, they are integrated into the ER membrane post-translationally using their C-terminal end as the anchor. TA proteins...
Structure of Cadherins
The cadherins were one of the first cell adhesion molecules discovered; the term “cadherins” is based on their calcium-dependent adhering properties. The first cadherins discovered on the epithelial, neuronal, and placental cells were named E-cadherin, P-cadherin, and N-cadherin, respectively. These classical cadherins share sequence and structural similarities. Other cadherins, including those involved in cell signaling, are grouped into non-classical cadherins. This diversity of cadherins...

