Comparison of efficiency of use of early and late promoters of T7 phage for β-galactosidase genie expression in Escherichia coli
DOI:
https://doi.org/10.7124/bc.000250Abstract
The model system for comparison of the efficiency of use of early and late promoters of T7 phage for the β-galactosidase gene expression has been constructed. The following strategy of construction has been chosen. The gene of T7 phage RNA-polymerase has been inserted into DNA of phage cloning vector. The model gene z of lac operon of E. coli (EcoRI-Sall digest of pLZ56) has been inserted into DNA of plasmid GEM-1 (firm «Promega») which contains phage T7 late promoter. The cloned pLZ56 fragment of DNA contains also S-D sites and A3 promoter specifically recognized by E. coli RNA-polymerase. Some features of b-galactosidase synthesis during transcription of the z gene under the control of the late promoter of phage T7 and under the control of A3 promoter are shown.References
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