Video Experimental Relacionado
Updated: Sep 9, 2025

03:29
Author Spotlight: Advancing Therapeutics to Treat Vibriosis in Humans and Aquatic Organisms
Published on: May 31, 2024
590
Estudios de estructura y función del reconocimiento de señales CqsR del receptor de quórum de Vibrio cholerae
Andrew M Guarnaccia1, Anjali D Steenhaut2, Sandra D Olenic2
1Department of Microbiology, Biochemistry, and Molecular Genetics, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey, United States of America.
PLoS pathogens
|September 4, 2025
Resumen
Este estudio revela la estructura del Vibrio cholerae
Área de la Ciencia:
- Microbiología y Biología Estructural
- Detección de quórum bacteriano
- Relaciones entre la estructura y la función de las proteínas
Sus antecedentes:
- El receptor transmembrana CqsR en Vibrio cholerae media la señalización de la etanolamina, lo que tiene un impacto en la colonización bacteriana.
- Comprender la estructura de CqsR es crucial para descifrar los mecanismos de detección de quórum.
- Los dominios de caché son módulos sensoriales procariotas extendidos con datos estructurales limitados.
Objetivo del estudio:
- Realizar un análisis integral de la estructura y la función del receptor CqsR.
- Para aclarar la base molecular de la especificidad del ligando de CqsR.
- Proporcionar información estructural sobre la función del receptor del dominio de caché.
Principales métodos:
- Se utilizó la cristalografía de rayos X para determinar las estructuras de CqsR en estados ligandos y apo.
- Los ensayos de unión termodinámica cuantificaron las interacciones del ligando.
- Se utilizaron análisis genéticos para evaluar la función de la CqsR.
Principales resultados:
- Se determinaron las estructuras cristalinas del dominio Cache periplásmico CqsR unido a la etanolamina, el serinol y el L-alaninol.
- La forma apo de CqsR también se caracterizó estructuralmente, lo que permite la comparación.
- Se identificaron cambios conformacionales inducidos por ligandos en la CqsR, lo que explica la especificidad.
Conclusiones:
- El estudio proporciona una comparación estructural rara de los dominios de caché ligandos y no ligados.
- Los hallazgos iluminan los mecanismos moleculares del reconocimiento del ligando CqsR.
- Este trabajo ayuda a identificar ligandos para receptores huérfanos y diseñar nuevos moduladores.
Videos de Conceptos Relacionados
Bacterial Signaling
34.0K
Bacterial signaling can occur within bacteria (intracellular) or between bacteria (intercellular). At times, a group of bacteria behaves like a community. To achieve this, they engage in quorum sensing, the perception of higher cell density that causes changes in gene expression. Quorum sensing involves both extracellular and intracellular signaling. The signaling cascade starts with a molecule called an autoinducer (AI). Individual bacteria produce AIs that move out of the bacterial cell...
34.0K
Gene Regulation in Microbial Communities: Quorum Sensing
92
Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...
92
Chemotaxis in E. coli
94
Chemotaxis in Escherichia coli is a sensory-driven motility mechanism that enables bacteria to navigate chemical gradients, moving toward beneficial environments while avoiding harmful conditions. This process relies on a signal transduction system integrating external chemical cues with flagellar motor control.Chemoreceptors and Signal DetectionE. coli detects chemical gradients through methyl-accepting chemotaxis proteins (MCPs), which are membrane-bound chemoreceptors that sense attractants...
94
Global Regulatory Systems
71
Global regulatory systems in bacteria enable rapid and coordinated responses to environmental changes by integrating sensory inputs with gene expression, ensuring efficient adaptation to fluctuating conditions. Key global regulatory mechanisms include regulons, two-component systems, sigma factors, and secondary messengers.Regulons and Global RegulatorsA regulon is a collection of genes and operons controlled by a common global regulator. These regulators enable bacteria to prioritize resource...
71
G Protein-coupled Receptors
13.2K
G Protein-Coupled Receptors or GPCRs are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to sensory stimuli such as light, odors, hormones, cytokines, or neurotransmitters.
GPCRs are also called heptahelical, 7TM, or serpentine receptors, and consist of seven (H1-H7) transmembrane alpha-helices that span the bilayer to form a cylindrical core. The transmembrane helices are connected by three extracellular loops and three...
GPCRs are also called heptahelical, 7TM, or serpentine receptors, and consist of seven (H1-H7) transmembrane alpha-helices that span the bilayer to form a cylindrical core. The transmembrane helices are connected by three extracellular loops and three...
13.2K
Cell Signaling in Plants
5.7K
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...
5.7K

