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• W2113452278 abstract "Staphylococcus aureus is a common human cutaneous and nasal commensal and a major life-threatening pathogen. Adaptation to the different environments encountered inside and outside the host is a crucial requirement for survival and colonization. We identified and characterized a eukaryotic-like serine/threonine kinase with three predicted extracellular PASTA domains (SA1063, or Stk1) and its associated phosphatase (SA1062, or Stp1) in S. aureus. Biochemical analyses revealed that Stk1 displays autokinase activity on threonine and serine residues and is localized to the membrane. Stp1 is a cytoplasmic protein with manganese-dependent phosphatase activity toward phosphorylated Stk1. In-frame deletions of the stk1 and stp1 genes were constructed in S. aureus strain 8325-4. Phenotypic analyses of the mutants revealed reduced growth of the stk1 mutant in RPMI 1640 defined medium that was restored when adenine was added to the medium. Furthermore, the stk1 mutant displayed increased resistance to Triton X-100 and to fosfomycin, suggesting modifications in cell wall metabolism. The stk1 mutant was tested for virulence in a mouse pyelonephritis model and found to be strongly reduced for survival in the kidneys (approximately 2-log-unit decrease) compared to the parental strain. Renal histopathological analyses showed severe inflammatory lesions in mice infected with the parental S. aureus SH1000 strain, whereas the Deltastk1 mutant led to only minimal renal lesions. These results confirm the important role of Stk1 for full expression of S. aureus pathogenesis and suggest that phosphorylation levels controlled by stk1 are essential in controlling bacterial survival within the host." @default.
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• W2113452278 date "2009-07-01" @default.
• W2113452278 modified "2023-10-18" @default.
• W2113452278 title "Characterization of a Serine/Threonine Kinase Involved in Virulence of <i>Staphylococcus aureus</i>" @default.
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• W2113452278 doi "https://doi.org/10.1128/jb.01813-08" @default.
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• W2113452278 hasPublicationYear "2009" @default.
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