Myelin protein zero and membrane adhesion

Area of Science:

• Neuroscience
• Molecular Biology
• Biochemistry

Background:

• Protein zero (P0) is a glycoprotein belonging to the immunoglobulin gene superfamily.
• P0 is highly expressed in the myelin of vertebrates, particularly in peripheral nerves.
• It functions as the primary adhesive molecule in peripheral myelin, facilitating Schwann cell plasma membrane self-adhesion.

Purpose of the Study:

• To elucidate the molecular mechanisms underlying P0-mediated cell adhesion.
• To understand the structural basis of P0 function at an atomic level.
• To investigate the link between P0 structure, function, and human dysmyelinating diseases.

Main Methods:

• X-ray crystallography to determine P0 structure.
• Site-directed mutagenesis to probe P0 function.
• Cell-based assays to assess P0-induced intercellular adhesion.
• Computational modeling to predict P0 lattice formation.

Main Results:

• P0 induces strong intercellular adhesion when expressed in various cell lines, indicating a general adhesive mechanism.
• Structural and modeling studies have yielded working models of P0 adhesion at the atomic level.
• Human P0 mutations are linked to dysmyelinating diseases, potentially due to defects in the P0 lattice.

Conclusions:

• P0's adhesive properties are fundamental to myelin structure and function.
• Understanding P0's atomic-level interactions is crucial for comprehending its role in adhesion.
• P0 mutations represent a significant cause of human dysmyelinating neuropathies.