HIGH-LEVEL EXPRESSION OF 5 FOREIGN GENES BY A SINGLE RECOMBINANT BACULOVIRUS

Go-infection with several viruses is often used to achieve simultaneou s expression of several proteins. From co-infections involving several viruses, the ratio of proteins synthesized in individual cells can be very variable, This is disadvantageous where proteins are needed to i nteract to provide a maximum yield of a complex product. Multiple-gene -expression vectors offer an alternative to co-infections. They enable reproducible ratios of products to be provided in each infected cell. Until recently, multigene-expression vectors have only been developed to make two proteins simultaneously, Here, we describe the generation of a single recombinant baculovirus synthesising up to five foreign p roteins with a fixed ratio comparable to the ratio during the synthesi s of native proteins.