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RNA Polymerase II Accessory Proteins02:36

RNA Polymerase II Accessory Proteins

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Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
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Eukaryotic RNA Polymerases00:58

Eukaryotic RNA Polymerases

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RNA Polymerase (RNAP) is conserved in all animals, with bacterial, archaeal, and eukaryotic RNAPs sharing significant sequence, structural, and functional similarities. Among the three eukaryotic RNAPs, RNA Polymerase II is most similar to bacterial RNAP in terms of both structural organization and folding topologies of the enzyme subunits. However, these similarities are not reflected in their mechanism of action.
All three eukaryotic RNAPs require specific transcription factors, of which the...
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Chromatin Structure Regulates pre-mRNA Processing02:41

Chromatin Structure Regulates pre-mRNA Processing

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In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
The chromatin structure, especially...
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Pre-mRNA Processing: Modification of pre-mRNA Ends01:35

Pre-mRNA Processing: Modification of pre-mRNA Ends

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In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a cap to the 5' end of the growing transcript. In this process, a 5' phosphate is replaced by modified guanosine that has a methyl group attached (7-methyl guanosine). This 5' cap helps...
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Updated: Apr 29, 2026

Artificial RNA Polymerase II Elongation Complexes for Dissecting Co-transcriptional RNA Processing Events
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Artificial RNA Polymerase II Elongation Complexes for Dissecting Co-transcriptional RNA Processing Events

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SnapShot: modificación de transcripción de RNAPII nuclear por modificación de la transcripción de RNAPII.

Manfred Schmid1, Torben Heick Jensen1

  • 1Centre for mRNP Biogenesis and Metabolism, Department of Molecular Biology and Genetics, Aarhus University, 8000 Aarhus, Denmark.

Cell
|May 27, 2014
PubMed
Resumen
Este resumen es generado por máquina.

La ARN polimerasa II crea varias moléculas de ARN, como el ARNm y el ARNmi. Estas transcripciones cruciales sufren modificaciones esenciales y procesamiento dentro del núcleo celular, facilitado por enzimas específicas.

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Área de la Ciencia:

  • Biología Molecular Biología Molecular
  • Genética La genética.
  • La bioquímica es la bioquímica.

Sus antecedentes:

  • La ARN polimerasa II es central para la expresión génica, produciendo diversos tipos de ARN.
  • Las transcripciones de ARN nacientes requieren una extensa modificación post-transcripcional.
  • Las enzimas nucleares juegan un papel crítico en el procesamiento y maduración del ARN.

Objetivo del estudio:

  • Para proporcionar una visión concisa de las vías de procesamiento de ARN.
  • Para resaltar las enzimas involucradas en la modificación del ARN nuclear.
  • Para ilustrar la diversidad de transcripciones de ARN generadas por la ARN polimerasa II.

Principales métodos:

  • Revisión de la literatura y síntesis de la investigación actual.
  • Representación visual de las etapas de procesamiento de ARN (formato SnapShot).
  • Centrarse en las enzimas clave y sus funciones.

Principales resultados:

  • Descripción detallada del procesamiento del ARNm, el ARNm, el ARNm, el ARNm, y el ARNm.
  • Identificación de las enzimas esenciales para la modificación del ARN nuclear.
  • Aclaración de los pasos secuenciales en la maduración del ARN.

Conclusiones:

  • La transcripción de la ARN polimerasa II es el primer paso en una compleja cascada de procesamiento de ARN.
  • Las enzimas nucleares son indispensables para generar moléculas de ARN funcionales.
  • Comprender estos procesos es vital para comprender la regulación génica y la función celular.