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Infection and Immunity, September 1999, p. 4751-4756, Vol. 67, No. 9
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

The Gene Locus yijP Contributes to Escherichia coli K1 Invasion of Brain Microvascular Endothelial Cells

Ying Wang, Sheng-He Huang, Carol A. Wass, Monique F. Stins, and Kwang Sik Kim*

Division of Infectious Diseases, Childrens Hospital Los Angeles, the University of Southern California School of Medicine, Los Angeles, California 90027

Received 25 March 1999/Returned for modification 19 May 1999/Accepted 9 June 1999

Most cases of Escherichia coli meningitis develop as a result of hematogenous spread, but it is not clear how circulating E. coli crosses the blood-brain barrier. A TnphoA mutant of E. coli K1 RS218 was shown to be significantly less invasive than its parent strain in bovine and human brain microvascular endothelial cells (BMEC), which constitute the blood-brain barrier. More importantly, traversal of the blood-brain barrier was significantly less with this mutant than with the parent strain in newborn rats with experimental hematogenous meningitis. A DNA segment containing the TnphoA insertion site was cloned from RS218, and the cloned DNA complemented the TnphoA mutant in invasion of BMEC. Nucleotide sequence revealed a near identity to that of a hypothetical yijP gene (also called f577) in the E. coli K-12 genome. Sequence analysis indicated that the E. coli K1 yijP gene likely encodes a 66.6-kDa membrane protein. Deletion and complementation experiments indicated that the yijP gene was involved in E. coli K1 invasion of BMEC, i.e., the invasive ability of E. coli K1 was significantly reduced after yijP was deleted and was restored by complementation with a plasmid containing the yijP open reading frame. This is the first demonstration that the yijP gene locus plays a role in the pathogenesis of E. coli K1 meningitis.

* Corresponding author. Mailing address: Division of Infectious Diseases, Mailstop #51, Childrens Hospital Los Angeles, 4650 Sunset Blvd., Los Angeles, CA 90027. Phone: (323) 669-2509. Fax: (323) 660-2661. E-mail: kskim{at}chla.usc.edu.

Infection and Immunity, September 1999, p. 4751-4756, Vol. 67, No. 9
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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