3TSI : Structure of the parainfluenza virus 5 (PIV5) hemagglutinin-neuraminidase (HN) stalk domain

  • Theodore S. Jardetzky (Contributor)
  • Robert A. Lamb (Contributor)
  • Sayantan Bose (Contributor)
  • Brett D. Welch (Contributor)
  • Christopher A. Kors (Contributor)
  • Ping Yuan (Contributor)

Dataset

Description

Experimental Technique/Method:X-RAY DIFFRACTION
Resolution:2.65
Classification:VIRAL PROTEIN
Release Date:2011-10-26
Deposition Date:2011-09-13
Revision Date:2011-12-14#2015-10-21#2017-11-08
Molecular Weight:27394.78
Macromolecule Type:Protein
Residue Count:260
Atom Site Count:1466
DOI:10.2210/pdb3tsi/pdb

Abstract:
Paramyxovirus entry into cells requires the fusion protein (F) and a receptor binding protein (hemagglutinin-neuraminidase [HN], H, or G). The multifunctional HN protein of some paramyxoviruses, besides functioning as the receptor (sialic acid) binding protein (hemagglutinin activity) and the receptor-destroying protein (neuraminidase activity), enhances F activity, presumably by lowering the activation energy required for F to mediate fusion of viral and cellular membranes. Before or upon receptor binding by the HN globular head, F is believed to interact with the HN stalk. Unfortunately, until recently none of the receptor binding protein crystal structures have shown electron density for the stalk domain. Parainfluenza virus 5 (PIV5) HN exists as a noncovalent dimer-of-dimers on the surface of cells, linked by a single disulfide bond in the stalk. Here we present the crystal structure of the PIV5-HN stalk domain at a resolution of 2.65 Å, revealing a four-helix bundle (4HB) with an upper (N-terminal) straight region and a lower (C-terminal) supercoiled part. The hydrophobic core residues are a mix of an 11-mer repeat and a 3- to 4-heptad repeat. To functionally characterize the role of the HN stalk in F interactions and fusion, we designed mutants along the PIV5-HN stalk that are N-glycosylated to physically disrupt F-HN interactions. By extensive study of receptor binding, neuraminidase activity, oligomerization, and fusion-promoting functions of the mutant proteins, we found a correlation between the position of the N-glycosylation mutants on the stalk structure and their neuraminidase activities as well as their abilities to promote fusion.
Date made available2011
PublisherRCSB-PDB

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