Video Experimental Relacionado
Updated: Jul 13, 2026
07:51
Pull-down of Calmodulin-binding Proteins
Published on: January 23, 2012
La desregulación de una cinasa dependiente de Ca2+/calmodulina conduce al desarrollo espontáneo de nódulos
Nature
|July 1, 2006
Resumen
La formación espontánea de nódulos en las legumbres puede desencadenarse sin la presencia de bacterias mediante la alteración genética de una proteína quinasa clave. Este descubrimiento revela una nueva vía reguladora para el desarrollo de órganos vegetales, independiente de las señales simbióticas típicas.
Área de la Ciencia:
- Biología Vegetal Biología Vegetal Biología Vegetal
- Genética molecular La genética molecular.
- Investigación de la simbiosis en la investigación de la simbiosis
Sus antecedentes:
- La simbiosis raíz-nódulo de leguminosas involucra bacterias fijadoras de nitrógeno y el desarrollo de órganos especializados de la raíz.
- Esta simbiosis es típicamente iniciada por señales rizobiales e involucra complejos programas celulares.
- Comprender la regulación genética de la formación de nódulos es crucial para las aplicaciones agrícolas.
Objetivo del estudio:
- Para investigar la desregulación genética de la organogénesis de nódulos de raíz en las legumbres.
- Identificar actores moleculares clave que controlan la formación espontánea de nódulos en ausencia de rizobia.
- Aclarar el papel regulador de la proteína quinasa dependiente de Ca2+/calmodulina (CCaMK) en el desarrollo de nódulos.
Principales métodos:
- La mutagenesis del sulfonato de etilmetano (EMS) en Lotus japonicus para identificar mutantes en la formación espontánea de nódulos (snf1).
- Análisis genético de un mutante snf1, incluida la secuenciación para identificar mutaciones en CCaMK.
- Caracterización fenotípica de nódulos espontáneos y análisis en antecedentes genéticos con deficiencia de receptores.
Principales resultados:
- Una sola sustitución de aminoácidos en CCaMK desregula la organogénesis de los nódulos de raíz, causando la formación espontánea de nódulos.
- Estos nódulos espontáneos exhiben una ontogenia genuina similar a los nódulos inducidos por rizobia.
- El proceso es independiente de la percepción de lipoquitina-oligosacárido (LCO) y las oscilaciones de Ca2+, lo que pone de relieve la función reguladora aguas arriba de CCaMK.
Conclusiones:
- CCaMK es un regulador central de la organogénesis de los nódulos, controlando la activación del ciclo celular independientemente de las señales simbióticas.
- La manipulación genética de CCaMK puede evitar la necesidad de rizobios para iniciar el desarrollo de nódulos.
- Los alelos mutantes de CCaMK demuestran funciones reguladoras tanto positivas como negativas en este proceso de desarrollo.
Más Videos Relacionados
09:32Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development
Published on: June 15, 2017
09:07Fluorescent Calcium Imaging and Subsequent In Situ Hybridization for Neuronal Precursor Characterization in Xenopus laevis
Published on: February 18, 2020
Videos de Conceptos Relacionados
01:41Non-Canonical Wnt Signaling Pathways
Wnt is a zygotic effect gene that is expressed during very early embryonic development. It regulates various processes in animals starting from early development through the adult stage, such as organogenesis in the embryo and maintenance of neuronal and blood stem cells. Wnt proteins can induce a wide variety of intracellular pathways depending upon the specific abilities of different Wnt ligands to form a complex with shared and cognate receptors in the presence of different co-receptors. The...
01:25Cell Signaling in Plants
Plant cells communicate to coordinate their cycle of growth, flowering and fruiting, and activities in roots, shoots, and leaves in response to the changing environmental conditions. Plant signaling is distinct from animal signaling. Plants primarily utilize enzyme-linked receptors, whereas the largest class of cell-surface receptors in animals are G-protein coupled receptors (GPCRs). Unlike animals, receptor tyrosine kinases are rare in plants. Instead, plants have a diverse class of...
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...
01:25cAMP-dependent Protein Kinase Pathways
Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
01:27Feedback Regulation of Calcium Concentration
Calcium is an essential signaling molecule required for various cellular functions. Calcium pumps and ion channels on cell and organellar membranes, such as those on the endoplasmic reticulum (ER), regulate calcium concentrations inside the cell. They remain closed, keeping the cytosolic calcium levels low at a resting state.
Various transmembrane receptors, such as G protein-coupled receptors (GPCRs), elicit a response to extracellular signals by increasing cytosolic calcium. Activated GPCRs...
Various transmembrane receptors, such as G protein-coupled receptors (GPCRs), elicit a response to extracellular signals by increasing cytosolic calcium. Activated GPCRs...
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,...