NDLI: Genes Expressed in Pseudomonas putida during Colonization of a Plant-Pathogenic Fungus

Content Provider	PubMed Central
Author	Lee, Seon-woo Cooksey, Donald A.
Copyright Year	2000
Abstract	In vivo expression technology (IVET) was employed to study colonization of Phytophthora parasitica by a biological control bacterium, Pseudomonas putida 06909, based on a new selection marker. The pyrB gene, which encodes aspartate transcarbamoylase, an enzyme used for pyrimidine biosynthesis, was cloned from P. putida 06909. A pyrB-disrupted mutant did not grow in pyrimidine-deficient media unless it was complemented with pyrBC′ behind an active promoter. Thirty clones obtained from P. putida 06909 that were expressed on fungal hyphae but not on culture media were isolated by IVET based on the promoterless transcriptional fusion between pyrBC′ and lacZ. Nineteen of these clones were induced during late-stage bacterial growth in vitro, while 11 of the clones were expressed only when they were inoculated onto fungal hyphae. Restriction analysis of these 11 clones revealed that there were five unique clones. Sequence analyses of three of the five unique clones showed that the 3′ ends of the clones fused to pyrB were similar to genes encoding diacylglycerol kinase (DAGK), bacterial ABC transporters, and outer membrane porins. The sequences of the two other clones were not similar to the sequences of any of the genes in the database used. A LuxR family response regulator was found upstream of DAGK, and a LysR family response regulator was found upstream of the ABC transporter. The location of the inducible promoter of two clones suggested that DAGK and the ABC transporter are induced and may play a role in colonization of the fungus P. parasitica by P. putida 06909.
Starting Page	2764
File Format	PDF
ISSN	10985336
e-ISSN	10985336
Journal	Applied and Environmental Microbiology
Issue Number	7
Volume Number	66
Language	English
Publisher	American Society for Microbiology
Publisher Date	2000-07-01
Access Restriction	Open
Rights Holder	American Society for Microbiology
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Ecology Food Science Applied Microbiology and Biotechnology Biotechnology

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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