Video Experimental Relacionado

Updated: May 18, 2026

Applying an Inducible Expression System to Study Interference of Bacterial Virulence Factors with Intracellular Signaling

Applying an Inducible Expression System to Study Interference of Bacterial Virulence Factors with Intracellular Signaling

Published on: June 25, 2015

La mistranslación de las proteínas de la membrana y la activación del sistema de dos componentes desencadenan la

Michael A Kohanski¹, Daniel J Dwyer, Jamey Wierzbowski

¹Department of Biomedical Engineering, Center for BioDynamics, and Center for Advanced Biotechnology, Boston University, Boston, MA 02215, USA.

|November 18, 2008

Resumen

Los antibióticos aminoglucósidos causan la muerte celular bacteriana a través del estrés oxidativo, vinculado a las proteínas de la membrana mal plegadas. Los sistemas de envolvente y de respuesta redox son clave para este mecanismo bactericida.

Área de la Ciencia:

Microbiología Microbiología.
Biología Molecular Biología Molecular
La bioquímica es la bioquímica.

Sus antecedentes:

Los antibióticos aminoglucósidos (por ejemplo, gentamicina, kanamicina) se dirigen a los ribosomas bacterianos.
Los mecanismos precisos de la muerte celular bacteriana inducida por aminoglucósidos, en particular los efectos bactericidas, siguen siendo incompletamente comprendidos.
El estrés oxidativo es cada vez más reconocido como un contribuyente a la acción bactericida de los antibióticos.

Objetivo del estudio:

Para dilucidar la vía por la cual los aminoglucósidos inducen el estrés oxidativo y la muerte celular.
Identificar los actores moleculares clave y las vías de señalización involucradas en la matanza mediada por aminoglucósidos.
Para determinar si estas vías son comunes a otros antibióticos bactericidas.

Principales métodos:

Se emplearon enfoques a nivel de sistemas.
Se realizaron análisis fenotípicos.
Se utilizaron manipulaciones genéticas dirigidas a los sistemas de tráfico de proteínas de membrana.

Principales resultados:

El estrés oxidativo inducido por los aminoglucósidos y la muerte celular son críticamente dependientes de la mala traducción y el mal plegamiento de las proteínas de la membrana.
La señalización a través del sistema de dos componentes de respuesta al estrés de la envolvente es esencial para este proceso.
Un sistema de dos componentes con respuesta redox también juega un papel importante.
Estos sistemas de dos componentes están ampliamente involucrados en el estrés oxidativo y la muerte celular inducida por varios antibióticos bactericidas.

Conclusiones:

Las proteínas de membrana mal plegadas y el posterior estrés oxidativo son fundamentales para la acción bactericida de los aminoglucósidos.
La envolvente y los sistemas de dos componentes con respuesta redox son mediadores clave de la muerte celular inducida por aminoglucósidos.
Estos hallazgos revelan un mecanismo común de muerte empleado por los antibióticos bactericidas, mejorando nuestra comprensión de la acción de los antibióticos.

Más Videos Relacionados

Characterization of MLKL-mediated Plasma Membrane Rupture in Necroptosis

Characterization of MLKL-mediated Plasma Membrane Rupture in Necroptosis

Published on: August 7, 2018

Measurement of Specific Mycobacterial Mistranslation Rates with Gain-of-function Reporter Systems

Measurement of Specific Mycobacterial Mistranslation Rates with Gain-of-function Reporter Systems

Published on: April 26, 2019

Videos de Conceptos Relacionados

Coordination of Gene Expression Processes in Bacteria

Coordination of Gene Expression Processes in Bacteria

The DNA replication, transcription, and translation processes are intricately coupled in bacteria, allowing efficient gene expression and rapid protein synthesis. While this physical and functional coordination is advantageous, it introduces challenges that bacteria overcome through specific regulatory mechanisms.Coupling of Replication, Transcription, and TranslationThe coupling of replication, transcription, and translation is a hallmark of bacterial gene expression. As the replisome unwinds...

Bacterial Translocation and Protein Secretion

Bacterial Translocation and Protein Secretion

Bacterial protein secretion involves translocation systems to ensure proteins reach their designated locations, including the plasma membrane, periplasm, outer membrane, or the external environment. These translocation systems are vital for bacterial physiology, supporting processes like membrane assembly, enzymatic activity in the periplasm, and interactions with the external environment. The division of labor between Sec and Tat pathways ensures efficiency in handling proteins with diverse...

Gram-negative Bacterial Protein Secretion Systems

Gram-negative Bacterial Protein Secretion Systems

Gram-negative bacteria utilize sophisticated protein secretion systems to transport proteins across their double-membrane envelope into the extracellular environment or host cells. Based on their mechanism of action, these systems are classified into one-step and two-step pathways.One-Step Secretion Systems (Types I, III, IV, and VI)One-step secretion systems bypass the periplasm entirely, forming a continuous channel that spans both the inner and outer membranes:Type I Secretion System (T1SS):...

Regulation of Bacterial Virulence

Regulation of Bacterial Virulence

Pathogenic bacteria employ a range of regulatory mechanisms to modulate the expression of virulence genes in response to environmental and host-derived signals. These mechanisms ensure that virulence factors are expressed only under favorable conditions, thereby optimizing infection and survival strategies.Mechanisms of Virulence RegulationKey regulatory strategies include:Two-Component Systems: These consist of a membrane-bound sensor kinase and a cytoplasmic response regulator. Environmental...

Inhibitors of Gram-positive Cell Wall Synthesis

Inhibitors of Gram-positive Cell Wall Synthesis

Bacterial cell walls are typically rigid structures composed mainly of peptidoglycan, a mesh-like polymer that provides mechanical strength and maintains cell shape. The synthesis of peptidoglycan is a crucial process in bacterial growth and serves as a primary target for many antibiotics.Mechanism of Action of Beta-Lactam AntibioticsBeta-lactam antibiotics, such as penicillin, inhibit peptidoglycan synthesis in actively growing cells. These antibiotics share a characteristic four-membered...

Inhibitors of Bacterial Protein Synthesis

Inhibitors of Bacterial Protein Synthesis

Aminoglycosides constitute a highly potent class of bactericidal antibiotics that exert their antimicrobial effects by targeting the bacterial ribosome, specifically disrupting protein synthesis. These polycationic molecules consist of amino-modified sugars linked via glycosidic bonds to an aminocyclitol core such as 2-deoxystreptamine or streptamine. Their strong positive charges facilitate tight binding to the negatively charged phosphate backbone of ribosomal RNA (rRNA), primarily at the 16S...