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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Herpes simplex virus thymidine kinase activity of thymidine kinase-deficient Escherichia coli K-12 mutant transformed by hybrid plasmids.

A hybrid plasmid (pAGO) that contains the herpes simplex virus type 1 (HSV-1) thymidine kinase ( TK) gene in the form of a 2-kilobase- pair (kbp) Pvu II fragment inserted at the Pvu II site of plasmid pBR322 was used to transform TK- Escherichia coli K-12 strain KY895. pAGO-transformed KY895 cells exhibited partially restored ability to incorporate [3H]dThd into DNA and an HSv-1-specific TK activity. Bacteria cured of plasmid pAGO (or transformed by plasmid pBR322) did not show enhanced incorporation of [3H]dThd into DNA or HSV-1 TK activity. Plasmid pMH1A was derived from pAGO by deletion of 2067 bp of DNA sequence from pBR322 and 105 bp from the HSV-1 TK gene. E. coli K-12 strain KY895 cells transformed by pMH1A did not show enhanced incorporation of [3H]dThd into bacterial DNA, although pMH1A DNA isolated from transformed KY895 cells, like pAGO DNA, did transform TK- mouse fibroblast [LM(TK-)] cells to the TK+ phenotype. The expression of HSV-1 TK activity by E. coli K-12 suggests that intervening sequences may be absent from the coding region of HSV-1 tk or that the coding region of the gene possesses short intervening sequences which do not disrupt the translational reading frame.[1]


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