Video Experimental Relacionado
Updated: Aug 10, 2026
09:19
Analysis of SNARE-mediated Membrane Fusion Using an Enzymatic Cell Fusion Assay
Published on: October 19, 2012
Un potencial péptido de fusión y un dominio de ligando de integrina en una proteína activa en la fusión
C P Blobel1, T G Wolfsberg, C W Turck
1Department of Pharmacology, University of California San Francisco.
Nature
|March 19, 1992
Resumen
La fusión espermatozoide-óvulo involucra proteínas similares a las proteínas de fusión viral. El complejo proteico PH-30, crucial para la fertilización, comparte similitudes estructurales y funcionales con la maquinaria de fusión viral.
Área de la Ciencia:
- Biología de la reproducción Biología reproductiva.
- Biología molecular La biología molecular.
- La fusión de la membrana celular celular es la fusión de la membrana celular.
Sus antecedentes:
- La fusión espermatozoide-óvulo es un evento crítico de fusión de membrana que inicia el desarrollo embrionario.
- Los mecanismos de fusión célula-célula a menudo se conservan en todos los sistemas biológicos, incluida la entrada viral.
- La proteína de la superficie del esperma PH-30 está implicada en la mediación de la fusión espermatozoide-óvulo.
Objetivo del estudio:
- Para dilucidar las características moleculares del complejo proteico PH-30.
- Investigar las similitudes estructurales y funcionales entre PH-30 y las proteínas de fusión viral.
Principales métodos:
- Secuenciación del ADN complementario (ADNc) de las subunidades PH-30.
- Deducción de secuencias de aminoácidos para las subunidades alfa y beta maduras.
- Análisis de los dominios de proteínas y topología de la membrana.
Principales resultados:
- Se determinaron las secuencias complementarias de ADN y aminoácidos para las subunidades alfa y beta maduras de PH-30.
- Ambas subunidades se identifican como glicoproteínas de membrana integral de tipo I.
- La subunidad alfa posee un péptido de fusión, característico de las proteínas de fusión viral, y la subunidad beta contiene un dominio homólogo a los ligandos de integrina del veneno de serpiente.
Conclusiones:
- El complejo PH-30 alfa/beta exhibe una semejanza significativa con las proteínas de fusión viral en términos de topología de la membrana.
- Las funciones previstas de unión y fusión de PH-30 apoyan aún más su analogía con la maquinaria de fusión viral.
- Estos hallazgos proporcionan información molecular sobre los mecanismos conservados de la fusión de la membrana en la fertilización y la entrada viral.
Más Videos Relacionados
10:58SNARE-mediated Fusion of Single Proteoliposomes with Tethered Supported Bilayers in a Microfluidic Flow Cell Monitored by Polarized TIRF Microscopy
Published on: August 24, 2016
11:10Detergent-free Ultrafast Reconstitution of Membrane Proteins into Lipid Bilayers Using Fusogenic Complementary-charged Proteoliposomes.
Published on: April 5, 2018
Videos de Conceptos Relacionados
01:38Fertilization
During fertilization, an egg and sperm cell fuse to create a new diploid structure. In humans, the process occurs once the egg has been released from the ovary, and travels into the fallopian tubes. The process requires several key steps: 1) sperm present in the genital tract must locate the egg; 2) once there, sperm need to release enzymes to help them burrow through the protective zona pellucida of the egg; and 3) the membranes of a single sperm cell and egg must fuse, with the sperm...
01:26Fusion 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...
01:43SNAREs 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...
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...
01:10Integrins
Animal and protozoan cells do not have cell walls to help maintain shape and provide structural stability. Instead, these eukaryotic cells secrete a sticky mass of carbohydrates and proteins into the spaces between adjacent cells. This network of proteins and molecules is called an extracellular matrix or ECM.
Some ECM proteins assemble into a basement membrane to which the remaining components adhere. Proteoglycans typically form the bulk of the ECM while fibrous proteins, like collagen,...
Some ECM proteins assemble into a basement membrane to which the remaining components adhere. Proteoglycans typically form the bulk of the ECM while fibrous proteins, like collagen,...
01:15Activation of Integrins
Integrins bind ligands and transmit information from outside the cell to inside or vice-versa through an "outside-in signaling" or "inside-out signaling."
In "outside-in signaling," external factors in the extracellular space bind to exposed ligand binding sites on integrins. This causes the inactive protein to undergo a conformational change to become active. Integrins are often clustered on the cell membrane. Repetitive and regularly spaced ligand binding events provide an effective stimulus.
In "outside-in signaling," external factors in the extracellular space bind to exposed ligand binding sites on integrins. This causes the inactive protein to undergo a conformational change to become active. Integrins are often clustered on the cell membrane. Repetitive and regularly spaced ligand binding events provide an effective stimulus.
01:24Tagging 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...