Video Experimental Relacionado
Updated: May 5, 2026
10:12
Measuring Spatial and Temporal Ca2+ Signals in Arabidopsis Plants
Published on: September 2, 2014
11.4K
Las vías de transducción de señales fitocrómicas dependientes y independientes del calcio/calmodulina
1Laboratory of Plant Molecular Biology, Rockefeller University, New York, New York 10021-6399.
Cell
|June 4, 1993
Resumen
La señalización del fitocromo en las plantas involucra proteínas G que activan vías distintas. Una vía requiere calcio para la expresión génica y la fotosíntesis, mientras que otra controla la síntesis de antocianinas sin calcio, lo que indica una señalización celular autónoma.
Área de la Ciencia:
- Biología vegetal Biología vegetal
- La señalización molecular.
- La fotorrecepción es la fotorrecepción.
Sus antecedentes:
- El fitocromo regula numerosas respuestas de las plantas a través de mecanismos desconocidos.
- Comprender la transducción de señales del fitocromo es crucial para la ciencia de las plantas.
Objetivo del estudio:
- Para dilucidar los pasos iniciales de la transducción de señales fitocromáticas.
- Para identificar los principales intermediarios de señalización involucrados en las respuestas fitocrómicas.
Principales métodos:
- Desarrollo de ensayos de una sola célula para visualizar respuestas fitocrómicas.
- Microinyección de supuestos intermediarios de señalización en células de tomate con deficiencia de fitocromo.
Principales resultados:
- La fototransducción del fitocromo se inicia con la activación de la proteína G.
- Se identificaron dos vías aguas abajo distintas: una dependiente de calcio/calmodulina, la otra independiente.
- La vía dependiente del calcio influye en el ensamblaje del complejo fotosintético y la expresión génica.
- La vía independiente del calcio regula la biosíntesis de la antocianina.
- La señalización del fitocromo es autónoma de la célula y no requiere pasos activados por la luz después de la activación de la proteína G.
Conclusiones:
- La señalización del fitocromo implica la activación mediada por la proteína G de al menos dos vías separadas.
- El calcio y la calmodulina juegan un papel en respuestas específicas mediadas por fitocromo.
- La señalización es autónoma de la célula, con eventos clave que ocurren aguas abajo de la proteína G sin más activación de luz.
Más Videos Relacionados
Videos de Conceptos Relacionados
02:00Photoreceptors and Plant Responses to Light
22.5K
Light plays a significant role in regulating the growth and development of plants. In addition to providing energy for photosynthesis, light provides other important cues to regulate a range of developmental and physiological responses in plants.
22.5K
02:45Biological Clocks and Seasonal Responses
36.0K
The circadian—or biological—clock is an intrinsic, timekeeping, molecular mechanism that allows plants to coordinate physiological activities over 24-hour cycles called circadian rhythms. Photoperiodism is a collective term for the biological responses of plants to variations in the relative lengths of dark and light periods. The period of light-exposure is called the photoperiod.
36.0K
01:19Interactions Between Signaling Pathways
4.7K
Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
4.7K
01:15Amplifying Signals via Second Messengers
6.1K
Many receptor binding ligands are hydrophilic; they do not cross the cell membrane but bind to cell-surface receptors. Thus, their message must be relayed by second messengers present in the cell cytoplasm. There are several second messenger pathways, each with its own way of relaying information. For example, the G protein-coupled receptors can activate both phosphoinositol and cyclic AMP (cAMP) second messenger pathways. The phosphoinositol pathway is active when the receptor induces...
6.1K
01:25Cell Signaling in Plants
4.5K
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...
4.5K
01:16Calmodulin-dependent Signaling
5.0K
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,...
5.0K