Video Experimental Relacionado
Updated: Jul 2, 2026
11:32
Measuring Plasma Membrane Protein Endocytic Rates by Reversible Biotinylation
Published on: December 24, 2009
El aumento inducido por el éster de beta-forbol y el diacilglicerol de la liberación del transmisor está mediado por
Jeong Seop Rhee1, Andrea Betz, Sonja Pyott
1Abteilung Membranbiophysik, Max-Planck-Institut für Biophysikalische Chemie, Am Fassberg 11, D-37077 Göttingen, Bundesrepublik Deutschland.
Cell
|January 17, 2002
Resumen
La proteína Munc13-1 es crucial para la liberación de neurotransmisores, actuando como el receptor primario del diacilglicerol (DAG) en el cerebro. Su unión al dominio C1 es esencial para la plasticidad sináptica y la supervivencia de las neuronas.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- Biología Molecular Biología Molecular
- La plasticidad sináptica.
Sus antecedentes:
- Munc13-1 es una proteína presináptica vital para el primado de las vesículas sinápticas.
- Posee un dominio de diacilglicerol (DAG) / beta-forbol que se une con el éster C.
- Munc13-1 es un objetivo potencial de la vía de segundo mensajero de DAG, posiblemente actuando en paralelo a la proteína quinasa Cs (PKC).
Objetivo del estudio:
- Para investigar el papel del dominio C ((1) de Munc13-1 en la liberación de neurotransmisores dependientes del éster de DAG/beta-forbol.
- Determinar las contribuciones relativas de las PKC y Munc13-1 en la regulación de la liberación de neurotransmisores.
- Para dilucidar la función de Munc13-1 como un receptor del éster presináptico de DAG/beta-forbol.
Principales métodos:
- Se utilizaron ratones genéticamente modificados que expresaban una variante DAG/beta de Munc13-1 ((H567K) con deficiencia de unión al éster de forbol.
- Comparación de la liberación de neurotransmisores en ratones con el tipo salvaje Munc13-1 versus la variante mutante.
- Se analizó la eficacia sináptica y la supervivencia neuronal en diferentes condiciones.
Principales resultados:
- Los Munc13 fueron identificados como los principales receptores presinápticos del éster DAG/beta forbol en las neuronas del hipocampo.
- La modulación de la actividad de Munc13-1 a través de su dominio C(1) es crítica para la función sináptica.
- La interacción del dominio C1 con los ésteres de DAG/beta-forbol es esencial para los cambios de eficacia sináptica dependientes del uso y la supervivencia neuronal.
Conclusiones:
- Munc13-1 es el receptor presináptico primario para los ésteres de DAG/beta-forbol en el hipocampo.
- El dominio DAG/beta phorbol ester que se une a C(1) de Munc13-1 es indispensable para regular la liberación de neurotransmisores y la plasticidad sináptica.
- La modulación de la actividad de Munc13-1 es clave para la función sináptica adaptativa y la resiliencia neuronal.
Videos de Conceptos Relacionados
01:12What are Second Messengers?
Because many receptor binding ligands are hydrophilic, they do not cross the cell membrane and thus their message must be relayed to a second messenger on the inside. There are several second messenger pathways, each with their own way of relaying information. G-protein coupled receptors can activate both phosphoinositol and cyclic AMP (cAMP) second messenger pathways. The phosphoinositol path is active when the receptor induces phospholipase C to hydrolyze the phospholipid,...
01:15Amplifying Signals via Second Messengers
Many receptor binding ligands are hydrophilic; they do not cross the cell membrane but bind to cell-surface receptors. Thus, their message must be relayed by second messengers present in the cell cytoplasm. There are several second messenger pathways, each with its own way of relaying information. For example, the G protein-coupled receptors can activate both phosphoinositol and cyclic AMP (cAMP) second messenger pathways. The phosphoinositol pathway is active when the receptor induces...
01:09GPCRs Regulate Adenylyl Cylase Activity
Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of cells.
Two...
Two...
01:25cAMP-dependent Protein Kinase Pathways
Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
01:11IP3/DAG Signaling Pathway
Membrane lipids such as phosphatidylinositol (PI) are precursors for several membrane-bound and soluble second messengers. Specific kinases phosphorylate PI and produce phosphorylated inositol phospholipids. One such inositol phospholipids are the phosphatidylinositol-4,5 bisphosphate [PI(4,5)P2], present in the inner half of the lipid bilayer. Upon ligand binding, GPCR stimulates Gq proteins to turn on phospholipase Cꞵ. Activated phospholipase Cꞵ cleaves PI(4,5)P2 and produces two-second...
01:16Calmodulin-dependent Signaling
Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...