Science Publications

AB569 Publications

A Putative ABC Transporter Permease is Necessary For Resistance to Acidified Nitrite and EDTA in Pseudomonas aeruginosa Under Aerobic, Anaerobic, Planktonic or Biofilm Conditions

Authors

Cameron McDaniel, Warunya Panmanee, Shengchang Su, Renuka Kapoor, Kevin Cox, Andrew Paul, Gee Lau, Seung-Hyun Ko, Joel Mortensen, Joseph S. Lam, Daniel Muruve and Daniel Hassett

Details

Pseudomonas aeruginosa (PA) is an important airway pathogen of cystic fibrosis and chronic obstructive disease patients. Multiply drug resistant PA is becoming increasing prevalent and new strategies are needed to combat such insidious organisms. We have previously shown that a mucoid, mucA22 mutant PA is exquisitely sensitive to acidified nitrite (A-NO2-, pH 6.5) at concentrations that are well tolerated in humans. Here, we used a transposon mutagenesis approach to identify PA mutants that are hypersensitive to A-NO2-. Among greater than 10,000 mutants screened, we focused on PA4455, in which the transposon was found to disrupt ...
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Anaerobic killing of mucoid Pseudomonas aeruginosa by acidified nitrite derivatives under cystic fibrosis airway conditions

Authors

Sang Sun Yoon, Ray Coakley, Gee W. Lau, Sergei V. Lymar, Benjamin Gaston, Ahmet C. Karabulut, Robert F. Hennigan, Sung-Hei Hwang, Garry Buettner, Michael J. Schurr, Joel E. Mortensen, Jane L. Burns, David Speert, Richard C. Boucher, and Daniel J. Hassett

Details

Published in The Journal of Clinical Investigation, February 1, 2006

Abstract

Mucoid, mucA mutant Pseudomonas aeruginosa cause chronic lung infections in cystic fibrosis (CF) patients and are refractory to phagocytosis and antibiotics. Here we show that mucoid bacteria perish during anaerobic exposure to 15 mM nitrite (NO2) at pH 6.5, which mimics CF airway mucus. Killing required a pH lower than 7, implicating ...
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