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Coordination of Gene Expression Processes in Bacteria01:29

Coordination of Gene Expression Processes in Bacteria

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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...
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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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Bacterial Transcription01:53

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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.
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Translation in Prokaryotes01:29

Translation in Prokaryotes

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Prokaryote translation is a complex, highly coordinated process that converts genetic information from mRNA into functional proteins. It involves three stages: initiation, elongation, and termination, each facilitated by specific molecular components.Initiation of TranslationThe process begins with the assembly of the ribosomal subunits and initiation factors on the mRNA. In bacteria, the 30S ribosomal subunit recognizes the Shine-Dalgarno sequence in the mRNA, a conserved region upstream of...
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Bacterial RNA Polymerase00:43

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Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
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Initiation of Translation02:33

Initiation of Translation

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Initiating translation is complex because it involves multiple molecules. Initiator tRNA, ribosomal subunits, and eukaryotic initiation factors (eIFs) are all required to assemble on the initiation codon of mRNA. This process consists of several steps that are mediated by different eIFs.
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Updated: Dec 10, 2025

Using Coculture to Detect Chemically Mediated Interspecies Interactions
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Transcripción y traducción no acopladas funcionalmente en Bacillus subtilis

Grace E Johnson1, Jean-Benoît Lalanne1,2, Michelle L Peters1

  • 1Department of Biology, Massachusetts Institute of Technology, Cambridge, MA, USA.

Nature
|August 28, 2020
PubMed
Resumen

El acoplamiento de transcripción y traducción no es universal en las bacterias. En el Bacillus subtilis, la ARN polimerasa (RNAP) supera a los ribosomas, lo que lleva a

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Área de la Ciencia:

  • Biología molecular
  • La genómica
  • Fisiología microbiana

Sus antecedentes:

  • El acoplamiento de transcripción-traducción se considera tradicionalmente como un sello distintivo de la expresión génica bacteriana.
  • Este acoplamiento implica la ARN polimerasa (RNAP) y los ribosomas que coordinan la expresión y la regulación de los genes.
  • La universalidad de este acoplamiento a través de diversas especies bacterianas sigue siendo en gran medida inexplorada.

Objetivo del estudio:

  • Investigar si el acoplamiento transcripción-traducción es una característica fundamental de todas las bacterias.
  • Explorar las implicaciones de la transcripción y la traducción no acopladas en organismos modelo como Bacillus subtilis.
  • Identificar modos alternativos de expresión génica y sus mecanismos reguladores en procariotas.

Principales métodos:

  • Análisis comparativo de la RNAP y la cinética de los ribosomas en Bacillus subtilis.
  • Investigación de la vigilancia del ARN y de los mecanismos de control traslacional en sistemas no acoplados.
  • Análisis genómico para identificar firmas de "transcripción fugitiva" en los filos bacterianos.

Principales resultados:

  • Los ARNPs superan a los ribosomas en Bacillus subtilis, lo que demuestra una "transcripción fuera de control".
  • La transcripción no acoplada explica la dependencia reducida de la terminación dependiente de Rho y el aumento del uso de riboswitches y proteínas de unión al ARN.
  • Las firmas genómicas de la transcripción fugitiva están muy extendidas en diversos linajes bacterianos.

Conclusiones:

  • El movimiento acoplado de RNAP-ribosoma no es una característica general de la expresión génica bacteriana.
  • Las bacterias utilizan al menos dos modos principales de expresión génica: la transcripción acoplada a la traducción y la transcripción fuera de control.
  • Estos modos distintos dictan estrategias reguladoras específicas del genoma en las procariotas.