Summary
A specific 1,596 bp HincII fragment ('skc) from the chromosome of Streptococcus equisimilis contains an active streptokinase (SK) gene (skc) lacking, in addition to the expression signals, codons 1 through 39 of wild-type skc but retaining the remainder of the skc coding sequence together with the transcription terminator. Using this fragment as an indicator gene, we constructed two types of vectors which in appropriate hosts resulted in the synthesis of SK fusion proteins after insertional activation of 'skc. The first type are open reading frame (ORF) vectors in which 'skc was inserted into pUC18 out of frame with respect to lacZ' expression signals and 'skc such that the skc reading frame was restored resulted in the production of tripartite proteins which exhibited SK activity. The second type of vector, which functioned in both gram-positive and gram-negative bacteria, used the streptococcal speA expression and secretion signals in front of the ORF to activate 'skc insertionally. Using a large fragment from the chymosin gene as the target sequence, the usefulness of these vectors for studying foreign gene expression in streptococci as well as Escherichia coli was demonstrated.
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Klessen, C., Schmidt, K.H., Ferretti, J.J. et al. Tripartite streptokinase gene fusion vectors for gram-positive and gram-negative procaryotes. Mol Gen Genet 212, 295–300 (1988). https://doi.org/10.1007/BF00334699
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DOI: https://doi.org/10.1007/BF00334699