Video Experimental Relacionado

Updated: Sep 10, 2025

Comparing the Affinity of GTPase-binding Proteins using Competition Assays

Comparing the Affinity of GTPase-binding Proteins using Competition Assays

Published on: October 8, 2015

Reensamblaje de GTPase dividido-pequeño como un método para controlar la señalización celular con entradas definidas

Yuchen He¹, Benjamin M Faulkner¹, Rachel S Weatherford¹

¹Department of Chemistry, University of Virginia, Charlottesville, Virginia 22904, United States.

ACS chemical biology

|August 26, 2025

Resumen

Los investigadores desarrollaron un método plug-and-play para controlar la actividad de la pequeña guanina trifosfato (GTP) utilizando inductores químicos de la dimerización (CID). Este sistema permite un control temporal preciso sobre las vías de señalización celular.

Área de la Ciencia:

Biología molecular
Señalización celular
La bioquímica

Sus antecedentes:

Las pequeñas GTPasas son enzimas de señalización cruciales que regulan las funciones celulares como la migración y la proliferación.
Los métodos actuales carecen de control temporal directo sobre la pequeña actividad de la GTPasa, lo que dificulta la investigación.
Comprender las pequeñas funciones de la GTPasa requiere herramientas precisas para manipular su señalización.

Objetivo del estudio:

Desarrollar una metodología plug-and-play para el control directo y temporal de la pequeña actividad de la GTPasa.
Para permitir entradas definidas por el usuario para la regulación precisa de las vías de señalización celular.
Para crear una plataforma personalizable para el estudio de pequeñas funciones de GTPasa.

Principales métodos:

Emparejamiento de pequeñas GTPasas con inductores químicos de los sistemas de dimerización (CID).
Utilizando la modularidad de los pequeños sistemas de GTPasa para la selección de CID.
Implementar el sistema en células vivas para controlar vías de señalización específicas.

Principales resultados:

Demostró un método plug-and-play para el control temporal directo de la señalización de pequeñas GTPasas.
Demostró la activación consistente de la vía utilizando varios sistemas CID.
Se ha controlado con éxito la señalización MAPK, la formación de filopodios y la retracción celular.

Conclusiones:

Los sistemas de GTPasa divididos en pequeños ofrecen una plataforma personalizable para el control temporal de la señalización celular.
Este método permite una manipulación precisa de la pequeña actividad de la GTPasa con entradas definidas por el usuario.
Proporciona una herramienta valiosa para diseccionar las funciones de las pequeñas GTPasas en diversos procesos celulares.

Más Videos Relacionados

Spatio-Temporal Manipulation of Small GTPase Activity at Subcellular Level and on Timescale of Seconds in Living Cells

Spatio-Temporal Manipulation of Small GTPase Activity at Subcellular Level and on Timescale of Seconds in Living Cells

Published on: March 9, 2012

Detection of Small GTPase Prenylation and GTP Binding Using Membrane Fractionation and GTPase-linked Immunosorbent Assay

Detection of Small GTPase Prenylation and GTP Binding Using Membrane Fractionation and GTPase-linked Immunosorbent Assay

Published on: November 11, 2018

Videos de Conceptos Relacionados

GTPases and their Regulation

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,...

Small GTPases - Ras and Rho

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:

Activation and Inactivation of G Proteins

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...

Amplifying Signals via Enzymatic Cascade

Amplifying Signals via Enzymatic Cascade

When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze...

Assembly of Signaling Complexes

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,...

Rab Cascades

Rab Cascades

Rab GTPases act in a regulated cascade during membrane fusion, helping the lipid bilayers mix. The Rab family of proteins are active when bound to GTP, and inactive when bound to GDP. Hence, they act as guanine nucleotide-dependent molecular switches. Rab-GTP recognizes and binds to long or short-range tethering proteins to capture the target vesicle. These tethers coordinate with SNAREs on the vesicle and the target membrane to assemble the trans SNARE complex that locks the mixing bilayers.