Surfactant protein A binds to the fusion glycoprotein of respiratory syncytial virus and neutralizes virion infectivity

R Ghildyal, C Hartley, A Varrasso, J Meanger, D R Voelker, E M Anders, J Mills

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Collectins are a family of calcium-dependent collagenous lectins that appear to be important in innate host defense. We investigated the ability of three human collectins, namely, lung surfactant proteins A (SP-A) and D (SP-D) and the serum mannose-binding protein (MBP), to bind to the surface glycoproteins of respiratory syncytial virus (RSV). SP-A was shown to bind to the F (fusion) glycoprotein but not to the viral G (attachment) glycoprotein, and binding was completely abrogated in the presence of EDTA. Neither SP-D nor MBP bound to either glycoprotein. SP-A also neutralized RSV in a calcium dependent fashion. These results support a role for SP-A in the defense of infants against infection with RSV and indicate a possible mechanism for its protective activity.

Original languageEnglish
Pages (from-to)2009-2013
Number of pages5
JournalJournal of Infectious Diseases
Issue number6
Publication statusPublished - 1999
Externally publishedYes


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