Abstract
Colonial types of Neisseria gonorrhoeae were examined for the presence of pilus-independent antiphagocytic activity. Type 3 and depiliated type 1 gonococci had a shearing- and protease-resistant antiphagocytic activity that was eliminated by treatment with ethylenediaminetetraacetic acid (EDTA) and that was not present on type 4 bacteria. Incubation of EDTA-treated bacteria 37 degrees C for 90 min resulted in fas prevented by antibiotics that block the final assembly of cell wall macromolecules that depend on the C55-isoprenoid carrier for export. These include both lipopolysaccharide and peptidoglycan. Restoration was, however, unaffected by drugs that interfere with the synthesis of peptidoglycan, but not that of lipopolysaccharide, and by inhibitors of protein synthesis. These data suggested that gonococci have an antiphagocytic mechanism in addition to the previously described determinant (presumably pili) that was removed by blending or by treatment with proteases. Of the two antiphagocytic activities, type 1 had both, type 3 had only the EDTA-sensitive component, and type 4 had neither.
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Selected References
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