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Susceptibility

Alanyl-Phosphatidylglycerol and Lysyl-Phosphatidylglycerol Are Translocated by the Same MprF Flippases and Have Similar Capacities To Protect against the Antibiotic Daptomycin in Staphylococcus aureus

Christoph J. Slavetinsky, Andreas Peschel, Christoph M. Ernst
Christoph J. Slavetinsky
Interfaculty Institute of Microbiology and Infection Medicine, Cellular and Molecular Microbiology Division, University of Tübingen, Tübingen, Germany
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Andreas Peschel
Interfaculty Institute of Microbiology and Infection Medicine, Cellular and Molecular Microbiology Division, University of Tübingen, Tübingen, Germany
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Christoph M. Ernst
Interfaculty Institute of Microbiology and Infection Medicine, Cellular and Molecular Microbiology Division, University of Tübingen, Tübingen, Germany
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DOI: 10.1128/AAC.00370-12
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ABSTRACT

The lysinylation of negatively charged phosphatidylglycerol by MprF proteins reduces the affinity of cationic antimicrobial peptides (CAMPs) for bacterial cytoplasmic membranes and reduces the susceptibility of several Gram-positive bacterial pathogens to CAMPs. MprF of Staphylococcus aureus encompasses a lysyl-phosphatidylglycerol (Lys-PG) synthase and a Lys-PG flippase domain. In contrast, Clostridium perfringens encodes two MprF homologs which specifically synthesize alanyl-phosphatidylglycerol (Ala-PG) or Lys-PG, while only the Lys-PG synthase is fused to a putative flippase domain. It remains unknown whether cationic Lys-PG and zwitterionic Ala-PG differ in their capacities to be translocated by MprF flippases and if both can reduce CAMP susceptibility in Gram-positive bacteria. By expressing the MprF proteins of C. perfringens in an S. aureus mprF deletion mutant, we found that both lipids can be efficiently produced in S. aureus. Simultaneous expression of the Lys-PG and Ala-PG synthases led to the production of both lipids and slightly increased the overall amounts of aminoacyl phospholipids. Ala-PG production by the corresponding C. perfringens enzyme did not affect susceptibility to CAMPs such as nisin and gallidermin or to the CAMP-like antibiotic daptomycin. However, coexpression of the Ala-PG synthase with flippase domains of Lys-PG synthesizing MprF proteins led to a wild-type level of daptomycin susceptibility, indicating that Ala-PG can also protect bacterial membranes against daptomycin and suggesting that Lys-PG flippases can also translocate the related lipid Ala-PG. Thus, bacterial aminoacyl phospholipid flippases exhibit more relaxed substrate specificity and Ala-PG and Lys-PG are more similar in their capacities to modulate membrane functions than anticipated.

  • Copyright © 2012, American Society for Microbiology. All Rights Reserved.
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Alanyl-Phosphatidylglycerol and Lysyl-Phosphatidylglycerol Are Translocated by the Same MprF Flippases and Have Similar Capacities To Protect against the Antibiotic Daptomycin in Staphylococcus aureus
Christoph J. Slavetinsky, Andreas Peschel, Christoph M. Ernst
Antimicrobial Agents and Chemotherapy Jun 2012, 56 (7) 3492-3497; DOI: 10.1128/AAC.00370-12

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Alanyl-Phosphatidylglycerol and Lysyl-Phosphatidylglycerol Are Translocated by the Same MprF Flippases and Have Similar Capacities To Protect against the Antibiotic Daptomycin in Staphylococcus aureus
Christoph J. Slavetinsky, Andreas Peschel, Christoph M. Ernst
Antimicrobial Agents and Chemotherapy Jun 2012, 56 (7) 3492-3497; DOI: 10.1128/AAC.00370-12
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