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Nucleic Acids Res. Oct 11, 1990; 18(19): 5667–5672.
PMCID: PMC332298

Linearization of baculovirus DNA enhances the recovery of recombinant virus expression vectors.

Abstract

Engineered derivatives of Autographa californica multiple nucleocapsid nuclear polyhedrosis virus (AcMNPV) possessing a unique restriction site provide a source of viral DNA that can be linearized by digestion with a specific endonuclease. Circular or linearized DNA from two such viruses were compared in terms of their infectivity and recombinogenic activities. The linear forms were 15- to 150-fold less infectious than the corresponding circular forms, when transfected into Spodoptera frugiperda cells using the calcium phosphate method. Linear viral DNA was, however, proficient at recombination on co-transfection with an appropriate transfer vector. Up to 30% of the progeny viruses were recombinant, a 10-fold higher fraction of recombinants than was obtained from co-transfections with circular AcMNPV DNA. The isolation of a recombinant baculovirus expression vector from any of the AcMNPV transfer vectors currently in use can thus be facilitated by linearization of the viral DNA at the appropriate location.

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Selected References

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