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Related Concept Videos

Regulated mRNA Transport02:22

Regulated mRNA Transport

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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...
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Nuclear Export01:42

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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.
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Nuclear Export of mRNA02:31

Nuclear Export of mRNA

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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...
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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...
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Analysis of mRNA Nuclear Export Kinetics in Mammalian Cells by Microinjection
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An ATP-gated molecular switch orchestrates human mRNA export.

Ulrich Hohmann1,2,3, Max Graf4,5, László Tirián6

  • 1Research Institute of Molecular Pathology (IMP), Vienna BioCenter (VBC), Vienna, Austria. u.hohmann@imb-mainz.de.

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|November 6, 2025
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Summary
This summary is machine-generated.

Researchers uncovered the molecular mechanism of human mRNA export, identifying the ATPase UAP56 as a key switch. This ATPase protein directs messenger RNA (mRNA) from transcription-export (TREX) complexes to nuclear pore complexes (NPCs) for export.

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Method for the Isolation and Identification of mRNAs, microRNAs and Protein Components of Ribonucleoprotein Complexes from Cell Extracts using RIP-Chip
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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • Nuclear export of messenger RNA (mRNA) is crucial for eukaryotic gene expression.
  • While mRNA packaging into ribonucleoprotein complexes (mRNPs) is understood, the export process remains unclear.

Purpose of the Study:

  • To elucidate the molecular mechanisms governing human mRNA export.
  • To identify key proteins and pathways involved in the transition from transcription to nuclear export.

Main Methods:

  • Biochemical assays
  • Structural biology techniques
  • Analysis of transcription-export complexes (TREX) and nuclear pore complexes (NPCs)

Main Results:

  • Identified the ATPase UAP56 (DDX39) as a central molecular switch in mRNA export.
  • UAP56 directs nucleoplasmic mRNPs from TREX to NPC-anchored TREX-2 complexes via an ATP-gated mRNA-binding cycle.
  • Detailed the remodeling of mRNP complexes, their docking at NPCs, and release for export.

Conclusions:

  • Established a mechanistic framework for a general and evolutionarily conserved mRNA export pathway.
  • The findings provide critical insights into the regulation of gene expression at the post-transcriptional level.