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Infect Immun, August 1998, p. 3597-3605, Vol. 66, No. 8
0019-9567/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Iron Starvation of Bordetella avium Stimulates Expression of Five Outer Membrane Proteins and Regulates a Gene Involved in Acquiring Iron from Serum

Terry D. Connell,* Amy Dickenson, Andrew J. Martone, Kevin T. Militello, Melanie J. Filiatraut, Mark L. Hayman, and Joseph Pitula

Center for Microbial Pathogenesis and the Department of Microbiology, School of Medicine and Biomedical Sciences, State University of New York at Buffalo, Buffalo, New York 14214

Received 9 March 1998/Returned for modification 5 May 1998/Accepted 15 May 1998

Iron starvation of Bordetella avium induced expression of five outer membrane proteins with apparent molecular masses of 95, 92, 91.5, 84, and 51 kDa. Iron-responsive outer membrane proteins (FeRPs) of similar sizes were detected in six of six strains of B. avium, suggesting that the five FeRPs are common constituents of the outer membrane of most, if not all, strains of B. avium. Iron-regulated genes of B. avium were targeted for mutagenesis with the transposon TnphoA. Two mutants with iron-responsive alkaline phosphatase activities were isolated from the transposon library. The transposon insertion did not alter the iron-regulated expression of the five FeRPs in mutant Pho-6. The mutant Pho-20 exhibited a loss in expression of the 95-kDa FeRP and the 84-kDa FeRP. Both Pho-6 and Pho-20 were able to use free iron as a nutrient source. However, Pho-20 was severely compromised in its ability to use iron present in turkey serum. The data indicated that the mutation in Pho-20 affected expression of one or more components of an uptake machinery that is involved in acquisition of iron from organic ferricomplexes.

* Corresponding author. Mailing address: 138 Farber Hall, Dept. of Microbiology, 3435 Main St., Buffalo, NY 14214. Phone: (716) 829-3364. Fax: (716) 829-2158. E-mail: connell{at}acsu.buffalo.edu.

Infect Immun, August 1998, p. 3597-3605, Vol. 66, No. 8
0019-9567/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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