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Termination of Translation01:44

Termination of Translation

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The large ribosomal subunit has several important structures essential to translation. These include the peptidyl transferase center (PTC) - which is the site where the peptide bond is formed - and a large, internal, water-filled tube through which the nascent polypeptide moves. This latter structure is called the Peptide Exit Tunnel, and it begins at the PTC and spans the body of the large ribosomal subunit. During translation, as the nascent polypeptide chain is synthesized, it passes through...
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Termination of Translation01:44

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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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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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Improving Translational Accuracy02:07

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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...
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Removal of an Internal Translational Start Site from mRNA While Retaining Expression of the Full-Length Protein
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Terminación traslacional sin codón de parada

Nathan R James1, Alan Brown1, Yuliya Gordiyenko1

  • 1Medical Research Council (MRC) Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge, CB2 0QH, UK.

Science (New York, N.Y.)
|December 10, 2016
PubMed
Resumen
Este resumen es generado por máquina.

Los ribosomas bacterianos pueden detenerse en el extremo del ARN mensajero (ARNm). El factor de rescate de ribosomas alternativo A (ArfA) rescata estos complejos sin parar reclutando el factor de liberación 2 (RF2).

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Área de la Ciencia:

  • Biología molecular
  • Biología estructural
  • Genética bacteriana

Sus antecedentes:

  • Los ribosomas se estancan en el ARN mensajero (ARNm) que carece de un codón de parada, formando complejos sin parar problemáticos.
  • En las bacterias, el factor de rescate de ribosomas alternativo A (ArfA) es crucial para resolver estos ribosomas estancados.

Objetivo del estudio:

  • Para aclarar el mecanismo estructural por el cual ArfA rescata los ribosomas bacterianos sin parar.
  • Comprender cómo ArfA interactúa con el factor de liberación 2 (RF2) y el ribosoma.

Principales métodos:

  • Se utilizó la criomicroscopia electrónica (crio-EM) para determinar las estructuras de alta resolución.
  • Las estructuras capturaron ArfA unido al ribosoma con ARNm truncado de 3".

Principales resultados:

  • ArfA se une dentro del canal de ARNm ribosomal, actuando como un sustituto del codón de parada que falta.
  • ArfA recluta específicamente el factor de liberación 2 (RF2) en un estado compacto y preacomodado.
  • La conformación RF2 ligada a ArfA sugiere un mecanismo general para la terminación traslacional.

Conclusiones:

  • ArfA facilita la terminación traslacional al imitar un codón de parada y reclutar RF2.
  • Un interruptor conformacional en RF2, potencialmente desencadenado por ArfA, es clave para la liberación de péptidos.
  • Este estudio revela un mecanismo conservado para el rescate de ribosomas y la terminación traslacional en bacterias.