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Related Concept Videos

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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Pre-mRNA Processing: Modification of pre-mRNA Ends01:35

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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.
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The structure and stability of mRNA molecules regulates gene expression, as mRNAs are a key step in the pathway from gene to protein. In eukaryotes, the half-life of mRNA varies from a few minutes up to several days. mRNA stability is essential in growth and development. The absence of the proteins regulating its stability, such as tristetraprolin in mice, can cause systemic issues, including bone marrow overgrowth, inflammation, and autoimmunity.
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In vitro Transcription and Capping of Gaussia Luciferase mRNA Followed by HeLa Cell Transfection
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Normal and Aberrantly Capped mRNA Decapping.

Megerditch Kiledjian1, Mi Zhou1, Xinfu Jiao1

  • 1Department of Cell Biology and Neuroscience, Rutgers University, Piscataway, New Jersey, USA.

The Enzymes
|May 12, 2016
PubMed
Summary
This summary is machine-generated.

The Rai1-Rat1 complex identifies and degrades aberrant messenger RNAs (mRNAs) lacking a proper 7-methylguanosine cap. This novel quality control mechanism ensures mRNA 5'-end integrity, particularly under stress conditions.

Keywords:
Aberrant capRai1mRNA decappingmRNA quality control

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Area of Science:

  • Molecular Biology
  • Gene Expression Regulation
  • RNA Metabolism

Background:

  • Messenger RNAs (mRNAs) are modified with a 7-methylguanosine (m(7)G) cap for gene expression modulation.
  • Decapping enzymes like Dcp2 and Nudt16 remove the m(7)G cap, initiating mRNA decay.
  • The decay pathways for aberrantly capped mRNAs are less understood.

Purpose of the Study:

  • To investigate the role of Saccharomyces cerevisiae Rai1 protein in the decay of aberrantly capped mRNAs.
  • To elucidate the mechanism by which Rai1 ensures mRNA 5'-end integrity.

Main Methods:

  • Biochemical assays to study the hydrolytic activity of Rai1 on different mRNA cap structures.
  • Investigating the interaction and functional synergy between Rai1 and Rat1 exoribonuclease.
  • Analyzing the impact of nutritional stress on aberrantly capped mRNA populations in S. cerevisiae.

Main Results:

  • Rai1 selectively hydrolyzes uncapped or improperly capped mRNAs, generating a 5' monophosphate.
  • Rai1 forms a heterodimer with the Rat1 5'-3' exoribonuclease, creating a molecular motor.
  • This Rai1-Rat1 complex efficiently degrades aberrant mRNAs and functions as a quality control mechanism.
  • Aberrantly capped mRNAs increase under nutritional stress, highlighting Rai1's importance.

Conclusions:

  • The Rai1-Rat1 heterodimer represents a novel pathway for detecting and degrading aberrant mRNAs.
  • This mechanism ensures the integrity of mRNA 5'-ends, preventing the translation of faulty transcripts.
  • Rai1 plays a crucial role in cellular mRNA quality control, especially during stress responses.