Overexpression of thiol/disulfide isomerases enhances membrane fusion directed by the Newcastle disease virus fusion protein
UMass Chan Affiliations
Department of Molecular Genetics and MicrobiologyDocument Type
Journal ArticlePublication Date
2008-10-03Keywords
AnimalsCOS Cells
Cercopithecus aethiops
*Gene Expression Regulation, Enzymologic
HN Protein
*Membrane Fusion
Molecular Chaperones
Newcastle disease virus
Protein Disulfide-Isomerases
Viral Fusion Proteins
Life Sciences
Medicine and Health Sciences
Metadata
Show full item recordAbstract
Newcastle disease virus (NDV) fusion (F) protein directs membrane fusion, which is required for virus entry and cell-cell fusion. We have previously shown that free thiols are present in cell surface-expressed NDV F protein and that blocking the production of free thiols by thiol-disulfide exchange inhibitors inhibited the membrane fusion mediated by F protein (J Virol. 81:2328-2339, 2007). Extending these observations, we evaluated the role of the overexpression of two disulfide bond isomerases, protein disulfide isomerase (PDI) and ERdj5, in cell-cell fusion mediated by NDV glycoproteins. The overexpression of these isomerases resulted in significantly increased membrane fusion, as measured by syncytium formation and content mixing. The overexpression of these isomerases enhanced the production of free thiols in F protein when expressed without hemagglutination-neuraminidase (HN) protein but decreased free thiols in F protein expressed with HN protein. By evaluating the binding of conformation-sensitive antibodies, we found that the overexpression of these isomerases favored a postfusion conformation of surface-expressed F protein in the presence of HN protein. These results suggest that isomerases belonging to the PDI family catalyze the production of free thiols in F protein, and free thiols in F protein facilitate membrane fusion mediated by F protein.Source
J Virol. 2008 Dec;82(24):12039-48. Epub 2008 Oct 1. Link to article on publisher's siteDOI
10.1128/JVI.01406-08Permanent Link to this Item
http://hdl.handle.net/20.500.14038/39139PubMed ID
18829746Related Resources
Link to Article in PubMedae974a485f413a2113503eed53cd6c53
10.1128/JVI.01406-08