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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,...

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Related Experiment Video

Updated: Jun 3, 2025

Defining Gene Functions in Tumorigenesis by Ex vivo Ablation of Floxed Alleles in Malignant Peripheral Nerve Sheath Tumor Cells

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Published on: August 25, 2021

Disrupting the transmembrane domain interface between PMP22 and MPZ causes peripheral neuropathy.

Natalya Pashkova¹, Tabitha A Peterson¹, Christopher P Ptak²

¹Department of Molecular Physiology and Biophysics, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA.

|January 6, 2025

Summary

Peripheral myelin protein 22 (PMP22) and MPZ form a complex crucial for myelin. A PMP22 variant disrupts this interaction, revealing the molecular basis of related neuropathies like Charcot-Marie-Tooth disease.

Keywords:

Biochemistry Cell biology Molecular biology Neuroscience

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Published on: June 15, 2018

Area of Science:

Neuroscience
Molecular Biology
Genetics

Background:

Peripheral myelin protein 22 (PMP22) and MPZ are key Schwann cell myelin proteins.
Alterations in PMP22 and MPZ cause demyelinating peripheral neuropathies, including Charcot-Marie-Tooth disease (CMT).
The precise molecular functions of PMP22 and mechanisms underlying CMT remain unclear.

Purpose of the Study:

To elucidate the molecular interaction between PMP22 and MPZ.
To investigate the functional consequences of PMP22 mutations on this interaction.
To define the structural basis of PMP22-MPZ complex formation.

Main Methods:

Co-immunoprecipitation assays to detect protein complex formation.
Analysis of PMP22 variants, including the A67T mutation, using cell-based assays.
Cellular localization studies to assess protein trafficking and membrane association.

Main Results:

MPZ and PMP22 form a specific complex mediated by their transmembrane domains.
The PMP22 A67T patient variant, associated with hereditary neuropathy with pressure palsies, disrupts MPZ binding.
This PMP22 variant does not affect its plasma membrane localization or interactions with other proteins.

Conclusions:

The MPZ-PMP22 complex is formed through specific interfaces within their transmembrane regions.
Disruption of the MPZ-PMP22 interaction by PMP22 variants underlies certain peripheral neuropathies.
This interaction is critical for normal myelin function in Schwann cells.