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. 1999 Dec;8(12):2562–2569. doi: 10.1110/ps.8.12.2562

Changing the surface of a virus shell fusion of an enzyme to polyoma VP1.

S Gleiter 1, K Stubenrauch 1, H Lilie 1
PMCID: PMC2144229  PMID: 10631971

Abstract

Recent developments on virus-like particles have demonstrated their potential in transfecting eucaryotic cells. In the case of particles based on the major coat protein VP1 of polyoma virus, transfection occurs via binding of VP1 to sialic acids. Since sialic acid is present on almost every eucaryotic cell line, this results in an unspecific cell targeting. Generation of a cell-type specificity of this system would imply the presentation of a new function on the surface of VP1. To analyze whether a new functional protein can be placed on VP1, we inserted dihydrofolate reductase from Escherichia coli as a model protein. The effect of such an insertion on both VP1 and the inserted protein was investigated, respectively. The function of VP1, like the formation of pentameric capsomers and its ability to assemble into capsids, was not influenced by the insertion. The inserted dihydrofolate reductase showed major changes when compared to the wild-type form. The thermal stability of the enzyme was dramatically reduced in the fusion protein; nevertheless, the dihydrofolate reductase proved to be a fully active enzyme with only slightly increased K(M) values for its substrates. This model system provides the basis for further modifications of the VP1 protein to achieve an altered surface of VP1 with new properties.

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Selected References

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