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1 Departments of Medicine and Pathology, Boston University School of Medicine, Boston, Massachusetts 02118; and 2 Department of Pathology, Washington University School of Medicine, St. Louis, Missouri 63110
We previously demonstrated that bovine serum conglutinin has markedly greater ability to inhibit influenza A virus (IAV) infectivity than other collectins. We now show that recombinant conglutinin and a chimeric protein containing the NH2 terminus and collagen domain of rat pulmonary surfactant protein D (rSP-D) fused to the neck region and carbohydrate recognition domain (CRD) of conglutinin (termed SP-D/Congneck+CRD) have markedly greater ability to inhibit infectivity of IAV than wild-type recombinant rSP-D, confirming that the potent IAV-neutralizing activity of conglutinin resides in its neck region and CRD. Furthermore, by virtue of incorporation of the NH2 terminus and collagen domain of SP-D, SP-D/Congneck+CRD caused substantially greater aggregation of IAV particles and enhancement of neutrophil binding of, and H2O2 responses to, IAV than recombinant conglutinin or recombinant rSP-D. Hence, SP-D/Congneck+CRD combined favorable antiviral and opsonic properties of conglutinin and SP-D. This study demonstrates an association of specific structural domains of SP-D and conglutinin with specific functional properties and illustrates that antimicrobial activities of wild-type collectins can be enhanced through recombinant strategies.
collectin; neutrophils; respiratory burst; virus; hemagglutination
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