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Nuclear Export

Nuclear Export

The nucleus restricts several proteins within and allows others to pass. The restricted proteins possess a nuclear retention sequence or NRS, anchoring them to the nuclear lamins and preventing their transport to the cytosol. The non-restricted proteins, after their synthesis, are transported to their site of action, such as the cytosol or other organelles, with the help of nuclear export signals or NES.
NES are of three types- the canonical 10-residue long leucine-rich signal and other...

Nuclear Export of mRNA

Nuclear Export of mRNA

Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...

Nuclear Export of mRNA

Nuclear Export of mRNA

Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...

Nuclear Protein Sorting

Nuclear Protein Sorting

Nuclear protein sorting is the selective trafficking of histones, polymerases, gene regulatory proteins into the nucleus and exporting RNAs and ribosomes to the cytosol. It is a tightly controlled process that regulates gene expression within a cell.
Proteins targeted to the nucleus carry nuclear localization signals or NLS recognized by import receptors in the cytosol. Similarly, proteins with nuclear export signals are recognized by export receptors. Import and export receptors are...

Directionality of Nuclear Transport

Directionality of Nuclear Transport

Ras-related nuclear protein or Ran is a small G protein that cycles between its GTP and GDP bound states. Ran specific regulators, a Ran GTPase Activating Protein or RanGAP present in the cytosol and a Ran guanine nucleotide exchange factor or RanGEF present inside the nucleus regulate GTP/GDP exchange. A high concentration of GTP inside the cells, in addition to this asymmetric distribution of Ran-specific regulators, leads to a higher RanGTP concentration inside the nucleus. This...

Regulated mRNA Transport

Regulated mRNA Transport

In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing specific...

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Analysis of mRNA Nuclear Export Kinetics in Mammalian Cells by Microinjection

Analysis of mRNA Nuclear Export Kinetics in Mammalian Cells by Microinjection

Published on: December 4, 2010

Dinámica de las exportaciones nucleares de los complejos ARN-proteína.

David Grünwald¹, Robert H Singer, Michael Rout

¹Delft University of Technology, Faculty of Applied Sciences, Kavli Institute of NanoScience, Department of Bionanoscience, 2628 CJ Delft, The Netherlands.

|July 22, 2011

Resumen

El dogma central describe el flujo de ADN a ARN a proteínas, pero la envoltura nuclear plantea una barrera. Las imágenes recientes de una sola molécula revelan nuevos conocimientos sobre los mecanismos de exportación de ARN nuclear.

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Analysis of mRNA Nuclear Export Kinetics in Mammalian Cells by Microinjection

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Área de la Ciencia:

Biología Molecular Biología Molecular
Biología celular Biología celular.
Genética La genética.

Sus antecedentes:

El dogma central de la biología molecular describe el flujo de información genética desde el ADN al ARN a las proteínas.
En las células eucariotas, la envoltura nuclear actúa como una barrera, regulando el transporte molecular a través de complejos de poros nucleares.
La exportación de ARN desde el núcleo es un paso crítico pero poco entendido en este flujo de información.

Objetivo del estudio:

Revisar los avances recientes en la comprensión de la exportación de ARN desde el núcleo.
Para presentar los modelos actuales que explican los mecanismos de exportación de ARN nuclear.

Principales métodos:

Revisión de la literatura científica más reciente.
Análisis de estudios de imágenes de una sola molécula.
Exploración de modelos teóricos para la exportación de ARN.

Principales resultados:

Las técnicas de imagen de una sola molécula han proporcionado nuevos conocimientos sobre la exportación de ARN.
La envoltura nuclear y los complejos de poros nucleares juegan un papel regulador clave.
Mecanismos complejos gobiernan el paso del ARN fuera del núcleo.

Conclusiones:

La comprensión de la exportación de ARN es crucial para comprender la expresión génica eucariota.
Las tecnologías de imagen emergentes son clave para desentrañar estos complejos procesos de transporte.
Se necesita más investigación para aclarar completamente los modelos de exportación de ARN.