Measles virus hemagglutinin: structural insights into cell entry and measles vaccine

Area of Science:

• Virology
• Immunology
• Structural Biology

Background:

• Measles virus (MV) is a highly contagious pathogen causing significant global childhood illness and death.
• MV entry into host cells is facilitated by its envelope glycoproteins: hemagglutinin (H) and fusion (F) protein.
• Cellular receptors targeted by MV include signaling lymphocyte activation molecule (SLAM), CD46, and nectin-4.

Purpose of the Study:

• To elucidate the structural mechanisms of MV entry into host cells.
• To understand the interaction between MV-H protein and its cellular receptors (SLAM, CD46).
• To provide insights relevant to the development and effectiveness of measles vaccines.

Main Methods:

• X-ray crystallography was employed to determine the structures of the MV-H protein.
• Structures were determined for both unbound MV-H protein and MV-H in complex with SLAM and CD46 receptors.

Main Results:

• Detailed crystal structures of the MV-H protein, both alone and bound to SLAM or CD46, were obtained.
• These structures illuminate the molecular details of receptor binding mediated by the H protein.
• The findings highlight the critical role of the H-F protein interaction in initiating MV cell entry.

Conclusions:

• Structural insights into MV-H protein-receptor interactions are crucial for understanding paramyxovirus entry mechanisms.
• This research provides a foundation for improving the efficacy of existing measles vaccines and developing novel antiviral strategies.