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Infection and Immunity, August 2006, p. 4598-4604, Vol. 74, No. 8
0019-9567/06/$08.00+0     doi:10.1128/IAI.00301-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

The Presence of Peptidoglycan O-Acetyltransferase in Various Staphylococcal Species Correlates with Lysozyme Resistance and Pathogenicity

Microbial Genetics, University of Tübingen, 72076 Tübingen, Germany

Received 23 February 2006/ Returned for modification 15 April 2006/ Accepted 8 May 2006

Human-pathogenic bacteria that are able to cause persistent infections must have developed mechanisms to resist the immune defense system. Lysozyme, a cell wall-lytic enzyme, is one of the first defense compounds induced in serum and tissues after the onset of infection. Recently, we showed that Staphylococcus aureus is resistant to lysozyme by O acetylating its peptidoglycan (PG) by O-acetyltransferase (OatA). We asked the question of which staphylococcal species PG is O acetylated. We applied various methods, such as genome analysis, PCR, Southern blotting, lysozyme sensitivity assay, and verification of O acetylation of PG by high-performance liquid chromatography (HPLC) analysis. PCR analysis using S. aureus-derived oatA primers and Southern blotting did not yield reliable results with other staphylococcal species. Therefore, we used the HPLC-based assay to directly detect PG O acetylation. Our studies revealed that the muramic acid was O acetylated only in pathogenic, lysozyme-resistant staphylococci (e.g., S. aureus, S. epidermidis, S. lugdunensis, and others). All nonpathogenic species were lysozyme sensitive. They can be divided into sensitive species (e.g., S. carnosus, S. gallinarum, and S. xylosus) and hypersensitive species (e.g., S. equorum, S. lentus, and S. arlettae). In all lysozyme-sensitive species, the analyzed PG was de-O-acetylated. When we transformed the oatA gene from lysozyme-resistant S. aureus into S. carnosus, the corresponding transformants also became lysozyme resistant.

Editor: J. L. Flynn

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