Video Experimental Relacionado
Updated: Jun 24, 2026
10:17
A Mass Spectrometry-Based Approach to Identify Phosphoprotein Phosphatases and their Interactors
Published on: April 29, 2022
Cómo las proteínacinasas activadas por mitógenos reconocen y fosforilan sus dianas: un estudio QM/MM
Adrian Gustavo Turjanski1, Gerhard Hummer, J Silvio Gutkind
1Oral and Pharyngeal Cancer Branch, National Institute of Dental and Craniofacial Research, and Laboratory of Chemical Physics, National Institutes of Health, Bethesda, Maryland 20892-0520, USA.
Journal of the American Chemical Society
|April 14, 2009
Resumen
Las proteínacinasas activadas por mitógenos (MAPK) como ERK regulan los procesos celulares y son objetivos del cáncer. Este estudio modela el ERKK.
Área de la Ciencia:
- Bioquímica y biología molecular.
- La señalización celular de las células.
- Investigación de la investigación del cáncer.
Sus antecedentes:
- Las vías de la proteína quinasa activada por mitógeno (MAPK) regulan las funciones celulares cruciales.
- La señalización aberrante de MAPK, particularmente ERK, está implicada en varios tipos de cáncer.
- Comprender las interacciones MAPK-sustrato es vital para el desarrollo de terapias contra el cáncer.
Objetivo del estudio:
- Para modelar la interacción entre ERK y un péptido objetivo.
- Para dilucidar el mecanismo de fosforilación por ERK.
- Para analizar la especificidad de ERK hacia los motivos Ser/Thr-Pro.
Principales métodos:
- Modelado de la mecánica cuántica y la mecánica molecular (QM/MM).
- Análisis de la interacción y especificidad del péptido ERK.
- Simulación computacional de la transferencia de fosforilo.
Principales resultados:
- El residuo de prolina mejora tanto la especificidad como la eficiencia de fosforilación.
- ERK2 Asp(147) actúa como la base catalítica en una reacción de un solo paso.
- Un residuo de Lys conservado estabiliza el estado de transición.
- La presencia de iones Mg ((2+) afecta mínimamente el mecanismo de reacción.
Conclusiones:
- Se aclara el mecanismo molecular detallado de la fosforilación catalizada por ERK.
- Se identificó el papel crítico de la prolina en la especificidad de las ERK y la catálisis.
- Conocimientos sobre la actividad de la quinasa y el potencial para terapias dirigidas contra el cáncer.
Videos de Conceptos Relacionados
01:07MAPK Signaling Cascades
Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
02:54Protein Kinases and Phosphatases
Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven.
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
01:22PI3K/mTOR/AKT Signaling Pathway
The mammalian target of rapamycin (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1 (mTORC1) and mTOR complex 2 (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast, mTORC2 consists of a rapamycin-insensitive companion...
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,...
02:38Mitogens and the Cell Cycle
Mitogens and their receptors play a crucial role in controlling the progression of the cell cycle. However, the loss of mitogenic control over cell division leads to tumor formation. Therefore, mitogens and mitogen receptors play an important role in cancer research. For instance, the epidermal growth factor (EGF) - a type of mitogen and its transmembrane receptor (EGFR), decides the fate of the cell's proliferation. When EGF binds to EGFR, a member of the ErbB family of tyrosine kinase...
02:15M-Cdk Drives Transition Into Mitosis
Checkpoints throughout the cell cycle serve as safeguards and gatekeepers, allowing the cell cycle to progress in favorable conditions and slow or halt it in problematic ones. This regulation is known as the cell cycle control system.
Cyclin-dependent kinases, or Cdks, work in concert with cyclins to control cell cycle transitions. M-Cdk, a complex of Cdk1 bound to M cyclin, is a well-known example of this coordinated control that drives the transition from the G2 to the M phase.
M cyclin...
Cyclin-dependent kinases, or Cdks, work in concert with cyclins to control cell cycle transitions. M-Cdk, a complex of Cdk1 bound to M cyclin, is a well-known example of this coordinated control that drives the transition from the G2 to the M phase.
M cyclin...