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• W2158591139 abstract "ABSTRACT In this study, the binding of F components of the staphylococcal bicomponent leukotoxins Panton-Valentine leucocidin (LukF-PV) and gamma-hemolysin (HlgB) on polymorphonuclear neutrophils (PMNs), monocytes, and lymphocytes was determined using labeled mutants and flow cytometry. Leukotoxin activity was evaluated by measuring Ca 2+ entry or pore formation using spectrofluorometry or flow cytometry. Although HlgB had no affinity for cells in the absence of an S component, LukF-PV had high affinity for PMNs (dissociation constant [ K d ], 6.2 ± 1.9 nM; n = 8), monocytes ( K d , 2.8 ± 0.8 nM; n = 7), and lymphocytes ( K d , 1.2 ± 0.2 nM; n = 7). Specific binding of HlgB was observed only after addition of LukS-PV on PMNs ( K d , 1.1 ± 0.2 nM; n = 4) and monocytes ( K d , 0.84 ± 0.31 nM; n = 4) or after addition of HlgC on PMNs, monocytes, and lymphocytes. Addition of LukS-PV or HlgC induced a second specific binding of LukF-PV on PMNs. HlgB and LukD competed only with LukF-PV molecules bound after addition of LukS-PV. LukF-PV and LukD competed with HlgB in the presence of LukS-PV on PMNs and monocytes. Use of antibodies and comparisons between binding and activity time courses showed that the LukF-PV molecules that bound to target cells before addition of LukS-PV were the only LukF-PV molecules responsible for Ca 2+ entry and pore formation. In contrast, the active HlgB molecules were the HlgB molecules bound after addition of LukS-PV. In conclusion, LukF-PV must be linked to LukS-PV and to a binding site of the membrane to have toxin activity." @default.
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• W2158591139 date "2009-01-01" @default.
• W2158591139 modified "2023-09-23" @default.
• W2158591139 title "Analysis of the Specificity of Panton-Valentine Leucocidin and Gamma-Hemolysin F Component Binding" @default.
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• W2158591139 doi "https://doi.org/10.1128/iai.00402-08" @default.
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