Video Experimental Relacionado

Updated: Apr 15, 2026

Isolation of Translating Ribosomes Containing Peptidyl-tRNAs for Functional and Structural Analyses

Isolation of Translating Ribosomes Containing Peptidyl-tRNAs for Functional and Structural Analyses

Published on: February 26, 2011

Regulación de la fosforilación ribosómica y sensibilidad a los antibióticos en Tetrahymena thermophila: una

R L Hallberg, P G Wilson, C Sutton

|October 1, 1981

Resumen

Las células de Tetrahymena thermophila se adaptan al estrés de las drogas al alterar la fosforilación del ribosoma. Esta adaptación cambia la forma en que los ribosomas interactúan con los antibióticos y aumenta su estabilidad térmica, lo que afecta la resistencia a los medicamentos.

Área de la Ciencia:

Biología celular Biología celular.
Biología Molecular Biología Molecular
La bioquímica es la bioquímica.

Sus antecedentes:

Tetrahymena thermophila exhibe cambios en la sensibilidad a los antibióticos cuando se pasa de los medios de crecimiento a los medios de inanición.
Los ribosomas son maquinaria celular clave afectada por estos cambios ambientales.

Objetivo del estudio:

Para investigar los mecanismos moleculares detrás de la adaptación a los fármacos de la Tetrahymena thermophila.
Para identificar cambios en la estructura y función de los ribosomas durante la inanición.

Principales métodos:

Comparando los ribosomas de las células Tetrahymena thermophila en crecimiento y las hambrientas.
Evaluación de las interacciones fármaco-ribosoma y la desnaturalización térmica del ribosoma.
Analizar los patrones de fosforilación de las proteínas ribosómicas.

Principales resultados:

El hambre induce resistencia a la cicloheximida, la tetraciclina y la emetina, pero la sensibilidad a la paromomicina y la anisomicina.
Se observaron diferencias en las interacciones fármaco-ribosoma y una mayor estabilidad térmica de los ribosomas de las células hambrientas.
El nivel de fosforilación de una sola pequeña subunidad de proteína ribosómica se correlaciona con estos cambios.

Conclusiones:

La fosforilación del ribosoma es un factor clave en la adaptación a los fármacos de Tetrahymena thermophila.
Esta fosforilación afecta las interacciones fármaco-ribosoma y la estabilidad del ribosoma.
Los hallazgos relacionan la fosforilación del ribosoma con la resistencia a la cicloheximida.

Más Videos Relacionados

Chromatographic Purification of Highly Active Yeast Ribosomes

Chromatographic Purification of Highly Active Yeast Ribosomes

Published on: October 24, 2011

RIBO-seq in Bacteria: a Sample Collection and Library Preparation Protocol for NGS Sequencing

RIBO-seq in Bacteria: a Sample Collection and Library Preparation Protocol for NGS Sequencing

Published on: August 7, 2021

Videos de Conceptos Relacionados

Types of RNA

Types of RNA

Overview
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...

Riboswitches

Riboswitches

Riboswitches are non-coding mRNA domains that regulate the transcription and translation of downstream genes without the help of proteins. Riboswitches bind directly to a metabolite and can form unique stem-loop or hairpin structures in response to the amount of the metabolite present. They have two distinct regions – a metabolite-binding aptamer and an expression platform.
The aptamer has high specificity for a particular metabolite which allows riboswitches to specifically regulate...

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...

Translational Regulation

Translational Regulation

Translational regulation in prokaryotes ensures efficient protein synthesis by controlling ribosome access to mRNA. This regulation is mediated by secondary RNA structures, including translational riboswitches, RNA thermometers, and small RNAs (sRNAs), which respond to intracellular and environmental signals to modulate gene expression.Translational RiboswitchesRiboswitches in the leader region of mRNAs can regulate translation by altering the accessibility of the Shine-Dalgarno (SD) sequence,...

Stringent Response in E. coli

Stringent Response in E. coli

Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...

Other Stress Responses in Bacteria

Other Stress Responses in Bacteria

Bacteria have global regulatory systems that control several types of stress mechanisms. These include Pho regulon and the heat shock response, which are essential systems for environmental adaptation, such as nutrient limitation and proteotoxic stress. The Pho regulon and the heat shock response exemplify bacterial resilience, enabling rapid adaptation to fluctuating environmental conditions.Pho RegulonBacteria require phosphorus for essential cellular processes, including nucleic acid...