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Nonsense-mediated mRNA Decay

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 Decay

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,...

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...

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...

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...

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MOS11: a new component in the mRNA export pathway.

Hugo Germain¹, Na Qu, Yu Ti Cheng

¹Michael Smith Laboratories, University of British Columbia, Vancouver, Canada.

|January 5, 2011

Summary

MOS11 is a newly identified protein crucial for plant immunity. It facilitates mRNA export from the nucleus, impacting plant disease resistance and development.

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Area of Science:

Plant molecular biology
Plant immunity and disease resistance
Nucleocytoplasmic transport mechanisms

Background:

Nucleocytoplasmic trafficking, including nuclear import, nuclear export, and mRNA export, is vital for plant immunity.
The MOS3 nucleoporin, part of the Nup107-160 complex, is known to be involved in mRNA export.
The Arabidopsis snc1 mutant exhibits dwarfism and enhanced disease resistance, linked to a TIR-NB-LRR resistance gene.

Purpose of the Study:

To characterize and analyze the Arabidopsis MOS11 gene and its role in plant immunity.
To investigate the function of MOS11 in nucleocytoplasmic trafficking, specifically mRNA export.
To determine the relationship between MOS11 and other known mRNA export factors like MOS3.

Main Methods:

Genetic analysis of Arabidopsis mutants, including characterization of mos11 mutations and epistasis analysis with mos3-1.
Molecular cloning and identification of the MOS11 gene.
Subcellular localization studies of MOS11.
Analysis of poly(A) mRNA distribution in wild-type and mutant plants.

Main Results:

Mutations in MOS11 partially suppress the phenotypes of the snc1 mutant, indicating a role in plant immunity.
MOS11 encodes a conserved eukaryotic protein homologous to human CIP29 and localizes to the nucleus.
mos11 mutants exhibit nuclear accumulation of poly(A) mRNAs, suggesting impaired mRNA export.
Epistasis analysis indicates MOS11 functions in the same pathway as MOS3, potentially before nuclear pore passage.

Conclusions:

MOS11 is a novel protein involved in the nuclear export of mature mRNA in Arabidopsis.
MOS11 plays a significant role in regulating plant immunity and development by modulating mRNA export.
The findings reveal a partially overlapping function between MOS11 and MOS3 in the mRNA export pathway.