Measles virus receptors

Area of Science:

• Virology
• Immunology
• Structural Biology

Background:

• Measles virus (MV) possesses two envelope glycoproteins: hemagglutinin (H) and fusion protein, mediating attachment and membrane fusion.
• Signaling lymphocyte activation molecule (SLAM, CD150) is the primary receptor for MV on immune cells, driving lymphotropism and immunosuppression.
• MV infects epithelial cells via an unidentified receptor, potentially facilitating aerosol transmission, and utilizes CD46 as an alternative receptor in adapted strains.

Purpose of the Study:

• To elucidate the cellular receptors utilized by Measles virus (MV) for host cell entry.
• To understand the structural basis of MV receptor-ligand interactions.
• To advance the comprehension of MV tropism and pathogenesis through receptor identification.

Main Methods:

• Analysis of the crystal structure of the MV H protein.
• Implication of various molecules in MV infection.
• Comparative analysis of receptor binding sites on the H protein.

Main Results:

• The H protein's crystal structure reveals distinct binding sites for SLAM, CD46, and the epithelial cell receptor.
• SLAM is identified as the principal receptor for MV on immune cells.
• CD46 serves as an alternate receptor for vaccine and lab-adapted MV strains.

Conclusions:

• The identification of specific MV receptors (SLAM, CD46, and an unknown epithelial receptor) clarifies MV tropism.
• Structural insights into H protein interactions with receptors advance understanding of MV pathogenesis.
• Further research is needed to confirm the roles of other implicated molecules in MV infection.