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Tight regulation, modulation, and high-level expression by vectors containing the arabinose PBAD promoter

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Guzman, L M, Belin, D, Carson, M J, Beckwith, J·1995·Journal of Bacteriology

Abstract

We have constructed a series of plasmid vectors (pBAD vectors) containing the PBAD promoter of the araBAD (arabinose) operon and the gene encoding the positive and negative regulator of this promoter, araC. Using the phoA gene and phoA fusions to monitor expression in these vectors, we show that the ratio of induction/repression can be 1,200-fold, compared with 50-fold for PTAC-based vectors. phoA expression can be modulated over a wide range of inducer (arabinose) concentrations and reduced to extremely low levels by the presence of glucose, which represses expression. Also, the kinetics of induction and repression are very rapid and significantly affected by the ara allele in the host strain. Thus, the use of this system which can be efficiently and rapidly turned on and off allows the study of important aspects of bacterial physiology in a very simple manner and without changes of temperature. We have exploited the tight regulation of the PBAD promoter to study the phenotypes of null mutations of essential genes and explored the use of pBAD vectors as an expression system.

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Crossref · 10.1128/jb.177.14.4121-4130.1995

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Authors
Guzman, L. M., Belin, D., Carson, M. J., & Beckwith, J.
Venue
Journal of Bacteriology
Published
1995-07
Volume
177
Issue
14
Pages
4121-4130
ISSN
  • 0021-9193 (ISSN-L)
  • 1098-5530
OpenAlex
W2160084442
Cited by
4,935
References
0
FWCI
28.59
Type
journal article
Language
en
Open access
green

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