Video Experimental Relacionado
Updated: May 8, 2026

09:58
RhoC GTPase Activation Assay
Published on: August 23, 2010
La dinamina de la GTPasa se une y es activada por un subconjunto de dominios SH3
Cell
|October 8, 1993
Resumen
Los dominios de homología 3 (SH3) de Src se unen a la dinamina de la GTPasa a través de motivos ricos en prolina. Esta interacción no solo facilita la unión proteína-proteína, sino que también regula la dinamina.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- La señalización celular de las células.
- Interacciones de las proteínas.
Sus antecedentes:
- Los dominios de homología 3 (SH3) de Src son cruciales para las interacciones proteína-proteína en las vías de señalización celular.
- La función exacta de los dominios SH3, particularmente en relación con las proteínas de unión a GTP, requiere una mayor aclaración.
Objetivo del estudio:
- Para identificar las proteínas que interactúan con los dominios SH3.
- Investigar las consecuencias funcionales de la unión del dominio SH3 a la actividad de la GTPasa.
Principales métodos:
- Se emplearon técnicas de purificación de afinidad para aislar las proteínas que se unen al dominio SH3.
- Los dominios SH3 recombinantes se utilizaron para estudiar las interacciones de unión selectiva.
- Se realizaron ensayos de actividad de la GTPasa para evaluar la regulación funcional.
Principales resultados:
- La dinamina de la GTPasa fue identificada como una nueva proteína de unión al dominio SH3.
- La unión se produjo a través de motivos de secuencia ricos en prolina, análogos a las interacciones conocidas de SH3.
- Se descubrió que varios dominios SH3 estimulan la actividad de la GTPasa de la dinamina.
Conclusiones:
- Los dominios SH3 median las interacciones específicas proteína-proteína con la dinamina.
- La función de los dominios SH3 se extiende más allá de la simple unión para incluir la regulación de la actividad de la proteína de unión al GTP.
- Estos hallazgos ofrecen nuevos conocimientos sobre el papel de los dominios SH3 en la señalización de los receptores y la regulación de la GTPasa.
Videos de Conceptos Relacionados
GTPases and their Regulation
Guanine nucleotide-binding proteins (G-proteins), also known as GTPases, are a superfamily of proteins that regulate many cellular processes, such as cell signaling, vesicular transport, and the regulation of cell shape and motility. Mutation or dysfunction of these proteins can lead to disease. There are around 40,000 known G-proteins that can broadly be classified into two groups ‒ small G-proteins consisting of a single domain and large multi-domain G-proteins.
Large G-proteins, also known...
Large G-proteins, also known...
Coat Assembly and GTPases
Vesicles incorporate different coat protein subunits in different cell locations, which changes the properties of the coat, such as the shape and geometry of the transport vesicles. Thus, vesicle coat proteins also play a significant role in cargo selection.
Coat assembly depends on the local availability of phosphatidylinositol phosphates or PIPs and GTP-binding proteins. Adaptor proteins, which link the coat proteins to the membrane, bind to these PIPs and play a crucial role in controlling...
Coat assembly depends on the local availability of phosphatidylinositol phosphates or PIPs and GTP-binding proteins. Adaptor proteins, which link the coat proteins to the membrane, bind to these PIPs and play a crucial role in controlling...
GTPases and their Regulation
Guanine nucleotide-binding proteins (G-proteins), also known as GTPases, are a superfamily of proteins that regulate many cellular processes, such as cell signaling, vesicular transport, and the regulation of cell shape and motility. Mutation or dysfunction of these proteins can lead to disease. There are around 40,000 known G-proteins that can broadly be classified into two groups ‒ small G-proteins consisting of a single domain and large multi-domain G-proteins.
Large G-proteins, also known...
Large G-proteins, also known...
Assembly of Signaling Complexes
Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
Small GTPases - Ras and Rho
Ras and Rho are small monomeric GTPases that act downstream of receptor tyrosine kinase (RTK) and regulate various cellular processes. These GTPases switch between active and inactive states by binding to guanine nucleotides.
Three regulatory proteins control their activity:
Three regulatory proteins control their activity:
Activation and Inactivation of G Proteins
Heterotrimeric G proteins are guanine nucleotide-binding proteins. As the name suggests, heterotrimeric G proteins are composed of three subunits: alpha, beta, and gamma. They remain GDP-bound or GTP-bound inside the cells and switch between inactive/active states. The Gα subunit possesses the nucleotide-binding pocket that binds guanine nucleotides and switches between GDP or GTP-bound states. In contrast, the Gꞵ and Gγ subunits are always bound together with high affinity and are together...

