Hybrid viral plasmid and microorganisms containing same

摘要

pML BK is a hybrid plasmid which is constructed of :pML which contains the entire nucleotide sequence of the plasmid pBR322 except for deletion of nucleotide sequences 1120-2490 bp and 0 to 375 bp, and BK which contains the entire nucleotide sequence of the Gardner strain of BK virus except for deletion of nucleotide sequences between bp 5089-5196. Into the pML BK plasmid may be inserted a viral or human gene X to be expressed, an example of which is TK which represents the Bam HI generated 3,600 bp DNA fragment of herpes simplex virus type 1 which contains the herpes simplex virus type 1 TK DNA. The majority of the pML BK X DNA molecules remain in the episomal or free state in the human cells 143B and express the gene X.