alexa Cloning of a gene involved in regulation of exotoxin A expression in Pseudomonas aeruginosa.


Journal of Microbial & Biochemical Technology

Author(s): Hedstrom RC, Funk CR, Kaper JB, Pavlovskis OR, Galloway DR

Abstract Share this page

Abstract We have cloned a gene from Pseudomonas aeruginosa that stimulates the expression of exotoxin A. A recombinant library of genomic DNA from strain PA103 constructed with a broad-host-range plasmid vector containing chromosomal insert fragments generated by Sau3A was used to transform the hypotoxigenic mutant strain PA103-29. A recombinant plasmid, pFHK6, was isolated from a PA103-29 transformant which displayed increased toxin production. From pFHK6, which contained a 20-kilobase-pair chromosomal insert, a 3-kilobase-pair XhoI fragment was isolated and subcloned into the plasmid cloning vector pVK101 to give pFHK10. In toxigenic P. aeruginosa strains containing pFHK10, toxin expression was increased 10-fold and high levels of iron in the culture medium only partially inhibited the overproduction. Expression studies suggested that pFHK10 did not contain the toxin structural gene. In addition, Southern analysis with the 3-kilobase-pair XhoI fragment suggested that the putative toxin regulatory gene is common among different strains of P. aeruginosa including previously reported nontoxigenic strains.
This article was published in Infect Immun and referenced in Journal of Microbial & Biochemical Technology

Relevant Expert PPTs

Relevant Speaker PPTs

Recommended Conferences

Relevant Topics

Peer Reviewed Journals
Make the best use of Scientific Research and information from our 700 + peer reviewed, Open Access Journals
International Conferences 2017-18
Meet Inspiring Speakers and Experts at our 3000+ Global Annual Meetings

Contact Us

© 2008-2017 OMICS International - Open Access Publisher. Best viewed in Mozilla Firefox | Google Chrome | Above IE 7.0 version