Direct binding of the flexible C-terminal segment of Periaxin to β4 integrin suggests a molecular basis for CMT4F

DOI: 10.3389/fnmol.2019.00084

Authors: Arne Raasakka (University of Bergen) , Helen Linxweiler (University of Bergen) , Peter J. Brophy (University of Edinburgh) , Diane L. Sherman (University of Edinburgh) , Petri Kursula (University of Bergen; University of Oulu)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Frontiers In Molecular Neuroscience , VOL 12

State: Published (Approved)
Published: April 2019

Abstract: The process of myelination in the nervous system requires a coordinated formation of both transient and stable supramolecular complexes. Myelin-specific proteins play key roles in these assemblies, which may link membranes to each other or connect the myelinating cell cytoskeleton to the extracellular matrix. The myelin protein periaxin is known to play an important role in linking the Schwann cell cytoskeleton to the basal lamina through membrane receptors, such as the dystroglycan complex. Mutations that truncate periaxin from the C terminus cause demyelinating peripheral neuropathy, Charcot-Marie-Tooth (CMT) disease type 4F, indicating a function for the periaxin C-terminal region in myelination. We identified the cytoplasmic domain of β4 integrin as a specific high-affinity binding partner for periaxin. The C-terminal region of periaxin remains unfolded and flexible when bound to the third fibronectin type III domain of β4 integrin. Our data suggest that periaxin is able to link the Schwann cell cytoplasm to the basal lamina through a two-pronged interaction via different membrane protein complexes, which bind close to the N and C terminus of this elongated, flexible molecule.

Journal Keywords: myelin; Charcot-Marie-Tooth disease; periaxin; integrin; protein structural & functional analysis

Diamond Keywords: Charcot‐Marie‐Tooth Disease (CMT)

Subject Areas: Biology and Bio-materials


Instruments: B21-High Throughput SAXS

Added On: 26/07/2019 15:29

Documents:
fnmol-12-00084.pdf

Discipline Tags:

Non-Communicable Diseases Health & Wellbeing Neurology Structural biology Life Sciences & Biotech

Technical Tags:

Scattering Small Angle X-ray Scattering (SAXS)