| Protein Name |
Myelin Protein Zero (P0) |
| Gene |
MPZ |
| UniProt |
P07846 |
| Molecular Weight |
~27 kDa |
| Subcellular Localization |
Myelin membrane, plasma membrane |
| Protein Family |
Immunoglobulin superfamily |
| Structure |
Single transmembrane domain, extracellular Ig domain |
Mpz Protein — Myelin Protein Zero is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
Myelin Protein Zero (MPZ/P0) is a 27-kDa transmembrane protein encoded by the MPZ gene. It is the most abundant protein in peripheral nervous system myelin, comprising approximately 50% of total myelin protein. MPZ is essential for the formation, maintenance, and compaction of the peripheral myelin sheath.
MPZ is a member of the immunoglobulin superfamily with distinctive structural features:
- Extracellular Ig Domain: N-terminal immunoglobulin-like domain for homophilic adhesion
- Single Transmembrane Domain: Anchors protein in the myelin membrane
- Intracellular C-terminus: Cytoplasmic domain involved in myelin compaction
- Molecular weight: Approximately 27 kDa
- Glycosylation: N-linked glycosylation affects protein function
The extracellular Ig domain mediates homophilic adhesion between adjacent myelin lamellae, forming the major dense line of myelin.
¶ Myelin Formation and Maintenance
- Structural Scaffold: Primary structural protein of peripheral myelin
- Homophilic Adhesion: Forms trans- and cis- interactions between myelin layers
- Myelin Compaction: Essential for formation of the major dense line
- Schwann Cell Signaling: Involved in signaling pathways controlling myelination
MPZ interacts with several proteins in the myelin sheath:
- PMP22: Coordinated expression for proper myelination
- Myelin Basic Protein (MBP): Structural interactions in myelin
- Peripheral Myelin Protein 2 (PMP2): Co-localization in myelin
- Neuregulin-1: Signaling during Schwann cell development
Over 200 MPZ mutations cause CMT1B with diverse phenotypes:
- Dominant-negative Effects: Many mutations disrupt protein function
- Protein Misfolding: ER retention of mutant proteins
- Demyelination: Primary myelin breakdown
- Axonal Degeneration: Secondary to demyelination
Severe MPZ mutations cause early-onset severe neuropathy:
- Early Onset: infancy or early childhood
- Profound Weakness: Severe motor and sensory deficits
- Marked Demyelination: Very slow nerve conduction velocities
A variant with CMT phenotype plus tremor:
- Features: Ataxia, tremor, areflexia
- Variable Expressivity: Different mutations cause different phenotypes
- Gene Replacement: AAV-mediated delivery of functional MPZ
- Gene Editing: CRISPR approaches to correct mutations
- Targeted Expression: Restricting expression to Schwann cells
- Stabilizers: Small molecules to improve mutant protein folding
- Protein Replacement: Exogenous MPZ delivery (challenging due to membrane topology)
- Chaperones: ER chaperone enhancement for misfolded proteins
¶ ASO and RNA-Based Therapy
- Allele-Specific ASO: Target mutant alleles while sparing wild-type
- RNAi Approaches: Knockdown of dominant-negative mutants
- Myelin protein zero: a myelin gene and its role in demyelinating diseases. Brain, 2022.
- MPZ mutations cause Charcot-Marie-Tooth disease type 1B. Brain, 2018.
- Structure of myelin protein zero. PNAS, 2014.
- MPZ-related neuropathies: from genetics to clinical phenotype. Brain, 2019.
The study of Mpz Protein — Myelin Protein Zero has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
- Myelin protein zero: a myelin gene and its role in demyelinating diseases. Brain, 2022. DOI
- MPZ mutations cause Charcot-Marie-Tooth disease type 1B. Brain, 2018. DOI
- Structure of myelin protein zero. PNAS, 2014. DOI
- MPZ-related neuropathies: from genetics to clinical phenotype. Brain, 2019. DOI
- UniProt: P07846
Page auto-generated from NeuroWiki protein database. Last updated: 2026-03-05.