Video Experimental Relacionado

Updated: Sep 9, 2025

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 25, 2011

Captura específica de la secuencia del complejo EF-Tu/glicil-tARN en el ribosoma por botromicina

Dmitrii Y Travin, Ritwika S Basu, Madhura N Paranjpe

bioRxiv : the preprint server for biology

|September 2, 2025

Resumen

La botromicina (BOT) atrapa el factor de alargamiento-Tu (EF-Tu) y el tRNA en el ribosoma, deteniendo la síntesis de proteínas. Este nuevo mecanismo, distinto de otros antibióticos, se dirige a los codones de glicina y ofrece una nueva estrategia contra la resistencia bacteriana.

Área de la Ciencia:

Microbiología
Biología molecular
Descubrimiento de drogas

Sus antecedentes:

La resistencia a los antimicrobianos requiere nuevos antibióticos.
La botromicina (BOT), un antibiótico péptido, muestra una actividad potente, pero su mecanismo no estaba claro.

Objetivo del estudio:

Para aclarar el mecanismo sin precedentes de la inhibición de la traducción por bottromicina (BOT).
Para identificar el objetivo molecular directo de BOT.

Principales métodos:

Ensayos bioquímicos
Estudios microbiológicos
Análisis genético
Enfoques de la biología estructural

Principales resultados:

BOT atrapa selectivamente el factor de alargamiento-Tu (EF-Tu) unido al glicil-tRNA en el ribosoma.
BOT estabiliza un estado A/T preacomodado, deteniendo la traducción en los codones de glicina.
Las mutaciones en EF-Tu confieren resistencia, lo que lo confirma como el objetivo directo.

Conclusiones:

BOT emplea un mecanismo único, distinto de otros antibióticos EF-Tu.
BOT representa una nueva clase de antibióticos que detienen los ribosomas al atrapar complejos específicos de factor de alargamiento tRNA.
La comprensión del mecanismo de BOT ayuda a desarrollar nuevas estrategias contra la resistencia a los antibióticos.

Más Videos Relacionados

Using SecM Arrest Sequence as a Tool to Isolate Ribosome Bound Polypeptides

Using SecM Arrest Sequence as a Tool to Isolate Ribosome Bound Polypeptides

Published on: June 19, 2012

Toeprinting Analysis of Translation Initiation Complex Formation on Mammalian mRNAs

Toeprinting Analysis of Translation Initiation Complex Formation on Mammalian mRNAs

Published on: May 10, 2018

Videos de Conceptos Relacionados

Improving Translational Accuracy

Improving Translational Accuracy

Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...

Transcription Attenuation in Prokaryotes

Transcription Attenuation in Prokaryotes

Transcriptional attenuation occurs when RNA transcription is prematurely terminated due to the formation of a terminator mRNA hairpin structure. Bacteria use these hairpins to regulate the transcription process and control the synthesis of several amino acids including histidine, lysine, threonine, and phenylalanine. Transcription attenuation takes place in the non-coding regions of mRNA.
There are several different mechanisms used to attenuate transcription. In ribosome mediated...

Tail-anchoring of Proteins in the ER Membrane

Tail-anchoring of Proteins in the ER Membrane

Tail-anchored, or TA, proteins are estimated to make up to 3-5% of membrane proteins found in the eukaryotic cell. Such proteins have a single transmembrane domain located approximately 30 amino acid residues upstream from the C-terminal end. As a result, the signal recognition particle (SRP) cannot guide a TA protein to the ER membrane for cotranslational insertion. Hence, they are integrated into the ER membrane post-translationally using their C-terminal end as the anchor. TA proteins...

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...

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...

Directing Proteins to the Rough Endoplasmic Reticulum

Directing Proteins to the Rough Endoplasmic Reticulum

The organelle-specific signaling sequences direct proteins synthesized in the cytosol to their final destination like ER, mitochondria, peroxisomes, etc. Some of the proteins directed to ER are then trafficked via vesicles to other organelles within the cell or the extracellular environment through the Golgi complex. For example, the rough ER synthesizes soluble proteins for transportation to the lysosomes or secretion out of the cell. It can also synthesize transmembrane proteins that can...