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Broad host range, regulated expression system utilizing bacteriophage T7 RNA polymerase and promoter
Author(s) -
Pagratis Nikos C.,
Revel Helen R.
Publication year - 1993
Publication title -
biotechnology and bioengineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.136
H-Index - 189
eISSN - 1097-0290
pISSN - 0006-3592
DOI - 10.1002/bit.260410902
Subject(s) - t7 rna polymerase , plasmid , pseudomonas putida , rna polymerase , microbiology and biotechnology , biology , polymerase , bacteriophage , escherichia coli , promoter , gene , gene expression , genetics
An IPTF‐regulated broad host range expression system was constructed using compatible broad host range plasmids, the T7 RNA polymerase, and T7 promoter sequences. The system is implemented by the coexistence of two plasmids. The first contains the T7 RNA polymerase gene under the control of lacl or lacl q genes and lacUV5 promoter. The second encodes the T7 promoter upstream of a multicloning site. IncP1 or IncP4 T7 promoter plasmids, and IncP1, IncP4 or IncW T7 RNA polymerase plasmids were constructed. The expression from the IncP1 promoter plasmids in the presence of the IncP4 polymerase plasmids was tested by in vivo lacZ fusions and vivo labeling of proteins. In this combination, the use of lac q improves the regulation levels in Escherichia coli , whereas, in Pseudomonas phaseolicola, a 28.5‐fold regulation was obtained with lacl , Although the level of lacZ expression from the T7 promoter in P. phaseolicola is low compared with E. coli , it is similar to levels obtained with the pm promoter in Pseudomonas putida when the differences in the copy number of the expression vectors are taken into consideration © 1993 Wiley & Sons, Inc.