Fig. 5: Structural insights into the protective Site 2-specific mAb PIV3HN-05. | Nature Communications

Fig. 5: Structural insights into the protective Site 2-specific mAb PIV3HN-05.

From: The structural basis of protective and nonprotective human monoclonal antibodies targeting the parainfluenza virus type 3 hemagglutinin-neuraminidase

Fig. 5

A Cryo-EM map of PIV3HN-05 Fab complexed with HN, with PIV3HN-05 Fab binding to the apical surface of HN. B When fit into a map of F (PDB: 6MJZ) and HN interaction (EMB: 27550), the PIV3HN-05 CDRH3 does not spatially interact with the active site of HN but fits directly within the HN active site. C Overlay of the Alphafold3 predicted structure (gray) and experimentally determined structure (HC: indigo, LC: mauve) of PIV3HN-05 Fab complexed to HN. HN monomers are shown in steel blue and sea green. D Interactions of the PIV3HN-05 CDRH3 with the PIV3 HN protein in the sialic acid binding pocket. Two hydrogen bonds are indicated with black dotted lines. Hydrophobic regions are highlighted with yellow translucent surfaces, with decreasing hydrophobicity depicted in teal. HN residues associated with sialic acid receptor interactions are labeled. Difluorosialic acid atoms fit into the HN model (PDB: 4WEF) and are depicted in black.

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