Characterizing the regulation of the Pu promoter in Acinetobacter baylyi ADP1

Wei E. Huang, Andrew C. Singer, Andrew J. Spiers, Gail M. Preston, Andrew S. Whiteley

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Abstract

Effective gene trapping and screening requires sensory and regulatory compatibility of both host and exogenous systems. The naturally competent bacterium Acinetobacter baylyi ADP1 is able to efficiently take up and integrate exogenous DNA into the chromosome, making it an attractive host system for a wide range of metagenomic applications. To test the ability of A. baylyi ADP1 to express the XylR regulated Pu promoter from Pseudomonas putida mt-2, we have constructed and examined an A. baylyi ADP1 strain, ADPWH-Pu-lux-xylR. The Pu promoter in ADPWH-Pu-lux-xylR was specifically induced by toluene, m-, p- and o-xylene. The substrate induced Pu promoter was highly dependent on the growth medium: it was repressed in rich media until stationary phase, but was immediately induced in minimal medium with glucose as the sole carbon source (MMG). However, the Pu promoter was repressed in MMG when it was supplemented with 5 g l-1 yeast extract. Further investigation showed that the Pu promoter in MMG was repressed by 0.5 g l-1 aspartic acid or asparagine, but not repressed by glutamine. Changing the carbon/nitrogen ratios by addition of ammonia did not significantly affect the Pu promoter activity but addition of nitrate did. These results show that A. baylyi ADP1 reproduced characteristics of the XylR-regulated Pu promoter observed in its original host. It demonstrates that A. baylyi could provide an excellent genetic host for a wide range of functional metagenomic applications.
Original languageEnglish
Pages (from-to)1668-1680
Number of pages13
JournalEnvironmental Microbiology
Volume10
Issue number7
DOIs
StatePublished - Jul 2008

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Metagenomics
Acinetobacter
Carbon
promoter regions
Xylenes
Pseudomonas putida
Asparagine
Toluene
Glutamine
Ammonia
Aspartic Acid
Nitrates
Nitrogen
Chromosomes
Yeasts
Bacteria
Glucose
DNA
Genes
carbon

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Huang, Wei E.; Singer, Andrew C.; Spiers, Andrew J.; Preston, Gail M.; Whiteley, Andrew S. / Characterizing the regulation of the Pu promoter in Acinetobacter baylyi ADP1.

In: Environmental Microbiology, Vol. 10, No. 7, 07.2008, p. 1668-1680.

Research output: Contribution to journalArticle

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abstract = "Effective gene trapping and screening requires sensory and regulatory compatibility of both host and exogenous systems. The naturally competent bacterium Acinetobacter baylyi ADP1 is able to efficiently take up and integrate exogenous DNA into the chromosome, making it an attractive host system for a wide range of metagenomic applications. To test the ability of A. baylyi ADP1 to express the XylR regulated Pu promoter from Pseudomonas putida mt-2, we have constructed and examined an A. baylyi ADP1 strain, ADPWH-Pu-lux-xylR. The Pu promoter in ADPWH-Pu-lux-xylR was specifically induced by toluene, m-, p- and o-xylene. The substrate induced Pu promoter was highly dependent on the growth medium: it was repressed in rich media until stationary phase, but was immediately induced in minimal medium with glucose as the sole carbon source (MMG). However, the Pu promoter was repressed in MMG when it was supplemented with 5 g l-1 yeast extract. Further investigation showed that the Pu promoter in MMG was repressed by 0.5 g l-1 aspartic acid or asparagine, but not repressed by glutamine. Changing the carbon/nitrogen ratios by addition of ammonia did not significantly affect the Pu promoter activity but addition of nitrate did. These results show that A. baylyi ADP1 reproduced characteristics of the XylR-regulated Pu promoter observed in its original host. It demonstrates that A. baylyi could provide an excellent genetic host for a wide range of functional metagenomic applications.",
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Characterizing the regulation of the Pu promoter in Acinetobacter baylyi ADP1. / Huang, Wei E.; Singer, Andrew C.; Spiers, Andrew J.; Preston, Gail M.; Whiteley, Andrew S.

In: Environmental Microbiology, Vol. 10, No. 7, 07.2008, p. 1668-1680.

Research output: Contribution to journalArticle

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