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Journal of Bacteriology, September 1999, p. 5865-5870, Vol. 181, No. 18
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Role of CCAA Nucleotide Repeats in Regulation of
Hemoglobin and Hemoglobin-Haptoglobin Binding Protein Genes of
Haemophilus influenzae
Zhen
Ren,1,2
Hongfan
Jin,1,2,
Paul W.
Whitby,1
Daniel J.
Morton,1 and
Terrence
L.
Stull1,2,*
Departments of
Pediatrics1 and
Microbiology/Immunology,2 University of
Oklahoma Health Sciences Center, Oklahoma City, Oklahoma 73104
Received 19 April 1999/Accepted 12 July 1999
Haemophilus influenzae utilizes hemoglobin and
hemoglobin-haptoglobin as heme sources. The H. influenzae
hemoglobin- and hemoglobin-haptoglobin binding protein genes,
hgpA, hgpB, and hgpC, contain
lengths of tetrameric CCAA repeats. Using an hgpA-lacZ
translational gene fusion, we demonstrate phase-variable expression of
lacZ associated with alteration in the length of the CCAA
repeat region.
*
Corresponding author. Mailing address: Department of
Pediatrics, CHO 2308, University of Oklahoma Health Sciences Center, 940 N.E. 13th St., Oklahoma City, OK 73104. Phone: (405) 271-4401. Fax:
(405) 271-8710. E-mail: Terrence-Stull{at}ouhsc.edu.

Present address: Department of Genetics, University of
Wisconsin

Madison, Madison, WI
53706.
Journal of Bacteriology, September 1999, p. 5865-5870, Vol. 181, No. 18
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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