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Related Concept Videos

mRNA Stability and Gene Expression02:51

mRNA Stability and Gene Expression

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.
Cis-acting Elements involved in mRNA stability
mRNA Stability and Gene Expression02:51

mRNA Stability and Gene Expression

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.
Cis-acting Elements involved in mRNA stability
Nonsense-mediated mRNA Decay02:27

Nonsense-mediated mRNA Decay

The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
Nonsense-mediated mRNA Decay02:27

Nonsense-mediated mRNA Decay

The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
Nuclear Export of mRNA02:31

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 mRNA02:31

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...

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Multifunctional deadenylase complexes diversify mRNA control.

Aaron C Goldstrohm1, Marvin Wickens

  • 1Department of Biochemistry, University of Wisconsin-Madison, Wisconsin 53706, USA.

Nature Reviews. Molecular Cell Biology
|March 13, 2008
PubMed
Summary
This summary is machine-generated.

mRNA poly(A) tail length, regulated by deadenylases, controls protein production and stability. Multifunctional deadenylase complexes offer unique mRNA control opportunities.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Messenger RNA (mRNA) poly(A) tail length is a critical regulator of gene expression, influencing mRNA stability and translation efficiency.
  • Deadenylase enzymes are central to this process, catalyzing dynamic changes in poly(A) tail length.
  • Dysregulation of deadenylation is implicated in various cellular processes and diseases.

Approach:

  • This work reviews recent advances in understanding the specialized activities, biological functions, and regulatory mechanisms of deadenylase enzymes.
  • It highlights the importance of multifunctional deadenylase complexes in mRNA regulation.
  • The review emphasizes the heterogeneity of these complexes and their roles.

Key Points:

  • Deadenylase enzymes dynamically regulate mRNA poly(A) tail length.
  • Poly(A) tail length modulation is a key mechanism for controlling protein production and mRNA stability.
  • Multifunctional deadenylase complexes offer sophisticated control over mRNA fate.
  • Complex heterogeneity allows for precise regulation of translation and mRNA stability.

Conclusions:

  • The recruitment of multifunctional deadenylase complexes presents unique opportunities for mRNA control.
  • The inherent heterogeneity of deadenylase complexes is strategically exploited to fine-tune translation and mRNA stability.
  • Further research into deadenylase complex composition and function will yield deeper insights into gene expression regulation.