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Transcription Attenuation in Prokaryotes02:42

Transcription Attenuation in Prokaryotes

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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...
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Pulmonary Tuberculosis II01:28

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Tuberculosis, or TB, is a bacterial infectious disease caused by Mycobacterium tuberculosis. While its primary impact is on the lungs, leading to pulmonary tuberculosis, it can also affect various other organs, a condition referred to as extrapulmonary tuberculosis.
Here is a detailed explanation of its pathophysiology:
Transmission: The process begins when a person inhales droplet nuclei containing M. tuberculosis. These are typically released into the air when an individual with pulmonary or...
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Regulated mRNA Transport02:22

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RNA polymerase (RNAP) carries out DNA-dependent RNA synthesis in both bacteria and eukaryotes. Bacteria do not have a membrane-bound nucleus. So, transcription and translation occur simultaneously, on the same DNA template.
Transcription can be divided into three main stages, each involving distinct DNA sequences to guide the polymerase. These are:
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Updated: Jul 2, 2025

A Novel Microdissection Approach to Recovering Mycobacterium tuberculosis Specific Transcripts from Formalin Fixed Paraffin Embedded Lung Granulomas
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Las transcripciones incompletas dominan el transcriptoma de Mycobacterium tuberculosis

Xiangwu Ju1, Shuqi Li2, Ruby Froom2,3

  • 1Laboratory of Nanoscale Biophysics and Biochemistry, The Rockefeller University, New York, NY, USA.

Nature
|February 28, 2024
PubMed
Resumen
Este resumen es generado por máquina.

La mayoría de las transcripciones de Mycobacterium tuberculosis (Mtb) están incompletas debido a la pausa de la ARN polimerasa, un punto de control clave para la adaptación bacteriana. Este mecanismo de pausa, influenciado por el factor σ y el acoplamiento transcripción-traducción, ofrece objetivos terapéuticos potenciales para la tuberculosis.

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Área de la Ciencia:

  • Microbiología
  • Biología molecular
  • La genética

Sus antecedentes:

  • El Mycobacterium tuberculosis (Mtb) es el causante de la tuberculosis (TB), un importante problema de salud mundial.
  • Mtb se adapta a los cambios ambientales alterando la expresión génica, pero los mecanismos reguladores no están claros.

Objetivo del estudio:

  • Investigar los mecanismos que regulan la transcripción de Mtb.
  • Para perfilar el transcriptoma Mtb en alta resolución.

Principales métodos:

  • Utilizó un método de secuenciación para determinar los terminales de la molécula de ARN en las células bacterianas.
  • Se analizó el transcriptoma Mtb para identificar las longitudes de transcripción y la actividad de la ARN polimerasa.

Principales resultados:

  • La mayoría de las transcripciones de Mtb son incompletas, con extremos de 5' en los sitios de inicio y 3' aguas abajo.
  • Los ARN cortos están vinculados a las polimerasas de ARN en pausa (ARNPs), no a la terminación prematura.
  • La pausa de Mtb RNAP depende de la unión con el factor σ.
  • La traducción de los ribosomas mejora el alargamiento de la transcripción, lo que sugiere un acoplamiento transcripción-traducción.

Conclusiones:

  • El transcriptoma Mtb se caracteriza por transcripciones incompletas debido a la pausa de RNAP.
  • La pausa de RNAP actúa como un punto de control transcripcional crucial para la adaptación de Mtb.
  • Este mecanismo de pausa presenta un objetivo potencial para las nuevas terapias contra la tuberculosis.