Video Experimental Relacionado
Updated: Aug 8, 2026
09:16
Oligopeptide Competition Assay for Phosphorylation Site Determination
Published on: May 18, 2017
La fosforilación directa de IkappaB por IKKalpha e IKKbeta: discriminación entre el sustrato libre y el
1Laboratory of Gene Regulation and Signal Transduction, Department of Pharmacology, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA.
Science (New York, N.Y.)
|August 28, 1998
Resumen
El inhibidor de la alfa-cinasa kappaB (IKKalpha) y el complejo IKKbeta directamente fosforila el inhibidor de la kappaB (IkappaB), regulando la activación del factor nuclear kappaB (NF-kappaB). Esta fosforilación influye en la terminación de la señalización de NF-kappaB.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- La señalización celular de las células.
- Bioquímica de las proteínas Bioquímica de las proteínas
Sus antecedentes:
- La activación del factor nuclear kappaB (NF-kappaB) está regulada por la fosforilación de su inhibidor, IkappaB.
- El complejo de la kinasa IkappaB (IKK), que comprende IKKalpha e IKKbeta, es crucial para este evento de fosforilación.
Objetivo del estudio:
- Investigar la actividad de fosforilación directa de IKKalpha e IKKbeta en IkappaB. para el estudio de la actividad de fosforilación directa de IKKalpha y IKKbeta en IkappaB. para el estudio de la actividad de fosforilación directa de IKKalpha y IKKbeta en IkappaB. para el estudio de la actividad de fosforilación directa de IKKalpha y IKKbeta en IkappaB. para el estudio de la actividad de fosforilación directa de IKKalpha y IKKbeta en IkappaB.
- Para aclarar el papel de la dimerización de IKKalpha e IKKbeta en la regulación de la NF-kappaB.
- Comprender el mecanismo por el cual la fosforilación de IkappaB influye en la terminación de la señalización de NF-kappaB.
Principales métodos:
- Expresión y purificación de IKKalpha e IKKbeta recombinantes en células de insectos.
- Ensayos de fosforilación in vitro utilizando subunidades purificadas de IKK y proteínas de IkappaB.
- Análisis de la formación de homodímeros y heterodímeros de IKKalpha e IKKbeta.
Principales resultados:
- Tanto el IKKalpha como el IKKbeta fosforilan directamente las proteínas IkappaB.
- El IKKalpha y el IKKbeta forman homodímeros y heterodímeros.
- La fosforilación de IkappaB unido a NF-kappaB es más eficiente que la de IkappaB libre.
Conclusiones:
- IKKalpha e IKKbeta median directamente la fosforilación de IkappaB, un paso clave en la activación de la NF-kappaB.
- La eficiencia de fosforilación diferencial de IkappaB ligado versus libre por las subunidades IKK proporciona un mecanismo para la terminación de la señalización NF-kappaB.
Videos de Conceptos Relacionados
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...
01:42Phosphoinositides and PIPs
Phosphoinositides are a group of phospholipids containing a glycerol backbone with two fatty acid chains and a phosphate attached to a myoinositol sugar ring. The inositol head group extends into the cytoplasm, where it is modified by adding phosphate groups to form phosphatidylinositol phosphates or PIPs.
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...
02:26NF-κB-dependent Signaling Pathway
The transcription factor NF-κB was discovered in 1986 in the lab of Nobel laureate Professor David Baltimore, for its interaction with the immunoglobulin light chain enhancer in B-cells. After more than three decades of study, it is now evident that NF-κB regulates the expression of over 100 genes. Most of these genes play an essential role in the innate and adaptive immune responses as well as the inflammatory responses of animals.
NF-κB-dependent Signaling Mechanism
The heterodimer of NF-κB...
NF-κB-dependent Signaling Mechanism
The heterodimer of NF-κB...
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...
01:20The JAK-STAT Signaling Pathway
Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as SH2...
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...