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. 1992 Nov;30(11):2874–2880. doi: 10.1128/jcm.30.11.2874-2880.1992

Baculovirus expression of the nucleoprotein gene of measles virus and utility of the recombinant protein in diagnostic enzyme immunoassays.

K B Hummel 1, D D Erdman 1, J Heath 1, W J Bellini 1
PMCID: PMC270545  PMID: 1452657

Abstract

A recombinant baculovirus that expresses the nucleoprotein gene of measles virus (Edmonston vaccine strain) under the transcriptional control of the polyhedrin promoter was generated. The expressed protein (B-MVN) comigrated with the authentic viral nucleoprotein as observed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis, and it was phosphorylated. The B-MVN protein proved to be reactive with monoclonal antibodies in radioimmunoprecipitations, and it was immunogenic, eliciting in mice antisera that recognized the native nucleoprotein. In addition, the B-MVN protein was evaluated as a replacement source of antigen for whole virus in enzyme immunoassays (EIAs) for detection of measles virus-specific immunoglobulin M (IgM) and IgG antibodies. A capture IgM EIA with the B-MVN protein as antigen detected specific IgM antibodies in 18 (72%) acute- and all convalescent-phase specimens from 25 clinical measles cases and exceeded 99% specificity with 120 control specimens. An indirect IgG EIA with the B-MVN protein detected specific IgG antibodies in 129 of 131 (98%) serum specimens with antibodies to measles virus, and results obtained from testing 268 additional serum specimens were better correlated with measles virus-neutralizing antibodies than those obtained with a commercial EIA.

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Selected References

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