[No authors listed]
Human parainfluenza virus type 3 (hPIV-3) is a clinically significant pathogen and is the causative agent of pneumonia and bronchiolitis in children. In this study the solution dynamics of human parainfluenza type 3 hemagglutinin-neuraminidase (HN) have been investigated. A flexible loop around Asp216 that adopts an open conformation in direct vicinity of the active site of the apo-form of the protein and closes upon inhibitor binding has been identified. To date, no available X-ray crystal structure has shown the molecular dynamics simulation-derived predominant loop-conformation states found in the present study. The outcomes of this study provide additional insight into the dynamical properties of hPIV-3 HN and may have important implications in defining HN glycan recognition events, receptor specificity, and antiparainfluenza virus drug discovery.
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