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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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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 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.
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The eukaryotic nucleus is a double membrane-bound organelle that contains nearly all of the cell’s genetic material in the form of chromosomes. It is rightly called the “brain” of the cell as it shoulders the responsibility of responding to various physiological processes, stress, altered metabolic conditions, and other cellular signals. 
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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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Mixed Messages: Dynamic and Compositional Heterogeneity of Nuclear Messenger Ribonucleoprotein (mRNP) Complexes.

Theresa Wechsler1,2, Ryuta Asada1, Ben Montpetit1,2

  • 1Department of Viticulture and Enology, University of California, Davis, California, USA.

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Summary

Messenger ribonucleoprotein (mRNP) complexes form during transcription. Key proteins like Yra1/ALYREF and the TREX complex are crucial for mRNP packaging and nuclear export, impacting gene expression and disease.

Keywords:
Saccharomyces cerevisiaeALYREFRBPRNA‐binding proteinTHOTREXYra1gene expressionmRNAmRNP

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • Messenger ribonucleoprotein (mRNP) complexes form co-transcriptionally, involving RNA-binding proteins (RBPs) and nascent transcripts.
  • Mature mRNA processing, packaging, and nuclear export are tightly regulated for gene expression fidelity.
  • Dysregulation of mRNP dynamics is implicated in viral infections, neurological disorders, and cancer.

Purpose of the Study:

  • To elucidate the compositional and organizational dynamics of nuclear mRNP assembly and maturation.
  • To highlight the roles of conserved proteins and complexes in mRNP packaging and export.
  • To explore how disruptions in mRNA biogenesis and export contribute to human diseases.

Main Methods:

  • Structural biology studies
  • Biochemical assays
  • In-cell investigations

Main Results:

  • Recent studies reveal critical roles for Yra1/ALYREF proteins and the TRanscription-EXport (TREX) complex in mRNP packaging and export.
  • These proteins and complexes exhibit broadly conserved functions across eukaryotes.
  • Advances deepen the understanding of nuclear mRNA metabolism.

Conclusions:

  • Understanding nuclear mRNP dynamics is essential for comprehending gene expression regulation and disease pathogenesis.
  • Yra1/ALYREF and the TREX complex are key players in mRNA processing and export.
  • Further research into mRNA biogenesis and export disruptions offers insights into disease mechanisms.