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J Biol Chem, Vol. 274, Issue 13, 8405-8410, March 26, 1999

Inactivation of the dlt Operon in Staphylococcus aureus Confers Sensitivity to Defensins, Protegrins, and Other Antimicrobial Peptides

Andreas PeschelDagger , Michael OttoDagger , Ralph W. Jack, Hubert Kalbacherparallel , Günther Jung, and Friedrich GötzDagger

From Dagger  Mikrobielle Genetik, Universität Tübingen, Waldhäuser Straße 70/8, 72076 Tübingen, Germany,  Organische Chemie, Universität Tübingen, 72076 Tübingen, Germany, ECHAZ Microcollections®, Sindelfingerstraße 3, 72070 Tübingen, Germany, and parallel  Physiologische Chemie, Universität Tübingen, Ob dem Himmelreich 7, 72074 Tübingen, Germany

Positively charged antimicrobial peptides with membrane-damaging activity are produced by animals and humans as components of their innate immunity against bacterial infections and also by many bacteria to inhibit competing microorganisms. Staphylococcus aureus and Staphylococcus xylosus, which tolerate high concentrations of several antimicrobial peptides, were mutagenized to identify genes responsible for this insensitivity. Several mutants with increased sensitivity were obtained, which exhibited an altered structure of teichoic acids, major components of the Gram-positive cell wall. The mutant teichoic acids lacked D-alanine, as a result of which the cells carried an increased negative surface charge. The mutant cells bound fewer anionic, but more positively charged proteins. They were sensitive to human defensin HNP1-3, animal-derived protegrins, tachyplesins, and magainin II, and to the bacteria-derived peptides gallidermin and nisin. The mutated genes shared sequence similarity with the dlt genes involved in the transfer of D-alanine into teichoic acids from other Gram-positive bacteria. Wild-type strains bearing additional copies of the dlt operon produced teichoic acids with higher amounts of D-alanine esters, bound cationic proteins less effectively and were less sensitive to antimicrobial peptides. We propose a role of the D-alanine-esterified teichoic acids which occur in many pathogenic bacteria in the protection against human and animal defense systems.


Copyright © 1999 by The American Society for Biochemistry and Molecular Biology, Inc.

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