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Outer membrane protein I of Pseudomonas aeruginosa is a target of cationic antimicrobial peptide/protein.


ABSTRACT: Cationic antimicrobial peptides/proteins (AMPs) are important components of the host innate defense mechanisms against invading microorganisms. Here we demonstrate that OprI (outer membrane protein I) of Pseudomonas aeruginosa is responsible for its susceptibility to human ribonuclease 7 (hRNase 7) and alpha-helical cationic AMPs, instead of surface lipopolysaccharide, which is the initial binding site of cationic AMPs. The antimicrobial activities of hRNase 7 and alpha-helical cationic AMPs against P. aeruginosa were inhibited by the addition of exogenous OprI or anti-OprI antibody. On modification and internalization of OprI by hRNase 7 into cytosol, the bacterial membrane became permeable to metabolites. The lipoprotein was predicted to consist of an extended loop at the N terminus for hRNase 7/lipopolysaccharide binding, a trimeric alpha-helix, and a lysine residue at the C terminus for cell wall anchoring. Our findings highlight a novel mechanism of antimicrobial activity and document a previously unexplored target of alpha-helical cationic AMPs, which may be used for screening drugs to treat antibiotic-resistant bacterial infection.

SUBMITTER: Lin YM 

PROVIDER: S-EPMC2838320 | biostudies-literature | 2010 Mar

REPOSITORIES: biostudies-literature

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Outer membrane protein I of Pseudomonas aeruginosa is a target of cationic antimicrobial peptide/protein.

Lin Yu-Min YM   Wu Shih-Jung SJ   Chang Ting-Wei TW   Wang Chiu-Feng CF   Suen Ching-Shu CS   Hwang Ming-Jing MJ   Chang Margaret Dah-Tsyr MD   Chen Yuan-Tsong YT   Liao You-Di YD  

The Journal of biological chemistry 20100125 12


Cationic antimicrobial peptides/proteins (AMPs) are important components of the host innate defense mechanisms against invading microorganisms. Here we demonstrate that OprI (outer membrane protein I) of Pseudomonas aeruginosa is responsible for its susceptibility to human ribonuclease 7 (hRNase 7) and alpha-helical cationic AMPs, instead of surface lipopolysaccharide, which is the initial binding site of cationic AMPs. The antimicrobial activities of hRNase 7 and alpha-helical cationic AMPs aga  ...[more]

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